WO2022219689A1 - レーザ装置、レーザ光のスペクトルの評価方法、及び電子デバイスの製造方法 - Google Patents
レーザ装置、レーザ光のスペクトルの評価方法、及び電子デバイスの製造方法 Download PDFInfo
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
- H01S3/1055—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length one of the reflectors being constituted by a diffraction grating
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- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/22—Gases
- H01S3/223—Gases the active gas being polyatomic, i.e. containing two or more atoms
- H01S3/225—Gases the active gas being polyatomic, i.e. containing two or more atoms comprising an excimer or exciplex
Definitions
- the present disclosure relates to a laser device, a method for evaluating the spectrum of laser light, and a method for manufacturing an electronic device.
- a KrF excimer laser device that outputs laser light with a wavelength of about 248 nm and an ArF excimer laser device that outputs laser light with a wavelength of about 193 nm are used.
- the spectral line width of the spontaneous oscillation light of the KrF excimer laser device and the ArF excimer laser device is as wide as 350-400 pm. Therefore, if the projection lens is made of a material that transmits ultraviolet light, such as KrF and ArF laser light, chromatic aberration may occur. As a result, resolution can be reduced. Therefore, it is necessary to narrow the spectral line width of the laser light output from the gas laser device to such an extent that the chromatic aberration can be ignored. Therefore, in the laser resonator of the gas laser device, a line narrow module (LNM) including a band narrowing element (etalon, grating, etc.) is provided in order to narrow the spectral line width.
- LNM line narrow module
- a gas laser device whose spectral line width is narrowed will be referred to as a band-narrowed gas laser device.
- a laser device is a laser device that can be connected to an exposure device, and includes a spectroscope that generates a measurement waveform from an interference pattern of laser light output from the laser device, and a processor, Calculate a first spectrum waveform that indicates the relationship between wavelength and light intensity using the measured waveform, calculate a representative wavelength included in the wavelength range of the first spectrum waveform, and calculate a function of wavelength deviation from the representative wavelength and light and a processor configured to calculate an evaluation value of the first spectral waveform using a first integrated value obtained by integrating the product with the intensity over a wavelength range.
- a laser light spectrum evaluation method generates a measured waveform from an interference pattern of laser light output from a laser device connectable to an exposure device, and uses the measured waveform to determine the wavelength and light intensity.
- Calculate a first spectral waveform indicating the relationship between calculate a representative wavelength included in the wavelength range of the first spectral waveform, and integrate the product of the wavelength deviation function from the representative wavelength and the light intensity with respect to the wavelength range calculating an evaluation value of the first spectrum waveform using the first integrated value obtained by the above.
- An electronic device manufacturing method includes a spectroscope that generates a measurement waveform from an interference pattern of laser light output from a laser device connectable to an exposure device, and a processor, wherein the measurement waveform is generated by: Calculate a first spectral waveform that indicates the relationship between wavelength and light intensity using, calculate a representative wavelength included in the wavelength range of the first spectral waveform, and calculate a function of wavelength deviation from the representative wavelength and light intensity and a processor configured to calculate an evaluation value of the first spectral waveform using a first integrated value obtained by integrating the product with respect to a wavelength range. It includes exposing laser light onto a photosensitive substrate in the exposure apparatus to output the light to the exposure apparatus and to manufacture the electronic device.
- FIG. 1 schematically shows the configuration of an exposure system in a comparative example.
- FIG. 2 schematically shows the configuration of a laser device according to a comparative example.
- FIG. 3 is a block diagram illustrating functions of a spectrum measurement control processor in a comparative example.
- FIG. 4 is a flow chart showing the procedure for measuring the spectral line width E95 in the comparative example.
- FIG. 5 is a graph showing an example of an estimated spectral waveform I( ⁇ ) of laser light.
- FIG. 6 is a graph showing another example of the spectrum waveform of laser light.
- FIG. 7 is a graph showing the distribution of focus positions in the exposure apparatus for the laser light indicated by spectral waveform #1 shown in FIG.
- FIG. 8 is a graph showing the focus position distribution in the exposure apparatus for the laser light indicated by spectral waveform #2 shown in FIG.
- FIG. 9 is a graph showing the focus position distribution in the exposure apparatus for the laser light indicated by the spectrum waveform #3 shown in FIG.
- FIG. 10 is a graph showing still another example of the spectrum waveform of laser light.
- FIG. 11 is a graph showing still another example of the spectrum waveform of laser light.
- FIG. 12 shows a rectangular imaging pattern used for evaluation of imaging performance.
- FIG. 13 is a graph showing simulation results of imaging performance in the exposure apparatus.
- FIG. 14 is a graph showing simulation results of imaging performance in the exposure apparatus.
- FIG. 15 schematically shows the configuration of a laser device according to an embodiment of the present disclosure.
- FIG. 16 is a flow chart showing the procedure for measuring the spectrum evaluation value V in the embodiment.
- FIG. 17 shows an imaging pattern used for comparison of usefulness of spectral evaluation value V and spectral line width E95.
- FIG. 18 is a graph showing the relationship between spectral line width E95 and ⁇ CD in the imaging pattern of FIG. 19 is a graph showing the relationship between the spectrum evaluation value V and ⁇ CD in the imaging pattern of FIG. 17.
- FIG. FIG. 20 shows another imaging pattern used to compare the usefulness of spectral evaluation value V and spectral linewidth E95.
- FIG. 21 is a graph showing the relationship between spectral line width E95 and ⁇ CD in the imaging pattern of FIG.
- FIG. 22 is a graph showing the relationship between the spectrum evaluation value V and ⁇ CD in the imaging pattern of FIG. 20.
- FIG. FIG. 23 is a graph showing the relationship between the spectral evaluation value V of Equation 4 and ⁇ CD in the imaging pattern of FIG.
- FIG. 24 is a graph showing the relationship between the spectral evaluation value V of Equation 4 and ⁇ CD in the imaging pattern of FIG.
- FIG. 25 is a flow chart showing the procedure of spectrum control in the embodiment.
- FIG. 26 schematically shows the configuration of a modification of the spectral waveform adjuster.
- FIG. 27 schematically shows the configuration of a modification of the spectral waveform adjuster.
- Comparative Example FIG. 1 schematically shows the configuration of an exposure system in a comparative example.
- the comparative examples of the present disclosure are forms known by the applicant to be known only by the applicant, and not known examples to which the applicant admits.
- the exposure system includes a laser device 1 and an exposure device 100.
- Laser device 1 includes a laser control processor 30 .
- the laser control processor 30 is a processing device that includes a memory 132 storing a control program and a CPU (central processing unit) 131 that executes the control program.
- Laser control processor 30 is specially configured or programmed to perform the various processes contained in this disclosure.
- the laser device 1 is configured to output laser light toward the exposure device 100 .
- Exposure apparatus 100 includes illumination optical system 101 , projection optical system 102 , and exposure control processor 110 .
- the illumination optical system 101 illuminates a reticle pattern of a reticle (not shown) placed on the reticle stage RT with laser light incident from the laser device 1 .
- the projection optical system 102 reduces and projects the laser beam transmitted through the reticle to form an image on a workpiece (not shown) placed on the workpiece table WT.
- the workpiece is a photosensitive substrate such as a semiconductor wafer coated with a resist film.
- the exposure control processor 110 is a processing device that includes a memory 112 storing a control program and a CPU 111 that executes the control program. Exposure control processor 110 is specially configured or programmed to perform the various processes contained in this disclosure. The exposure control processor 110 supervises the control of the exposure apparatus 100 and transmits/receives various data and various signals to/from the laser control processor 30 .
- the exposure control processor 110 transmits the wavelength target value data, the pulse energy target value data, and the trigger signal to the laser control processor 30 .
- the laser control processor 30 controls the laser device 1 according to these data and signals.
- the exposure control processor 110 synchronously translates the reticle stage RT and the workpiece table WT in opposite directions. As a result, the workpiece is exposed with laser light reflecting the reticle pattern. A reticle pattern is transferred to the semiconductor wafer by such an exposure process. After that, an electronic device can be manufactured through a plurality of steps.
- FIG. 2 schematically shows the configuration of a laser apparatus 1 according to a comparative example.
- the laser device 1 includes a laser oscillator 20 , a power supply 12 , a monitor module 16 , a laser control processor 30 , a wavelength measurement controller 50 and a spectrum measurement control processor 60 .
- the laser device 1 is connectable to the exposure device 100 .
- the laser oscillator 20 includes a laser chamber 10, a discharge electrode 11a, a band narrowing module 14, and a spectral waveform adjuster 15a.
- the band narrowing module 14 and the spectral waveform adjuster 15a constitute a laser resonator.
- a laser chamber 10 is arranged in the optical path of the laser resonator. Windows 10a and 10b are provided at both ends of the laser chamber 10.
- FIG. Inside the laser chamber 10, a discharge electrode 11a and a discharge electrode (not shown) paired therewith are arranged.
- a discharge electrode (not shown) is positioned so as to overlap the discharge electrode 11a in the direction of the V-axis perpendicular to the paper surface.
- the laser chamber 10 is filled with a laser gas containing, for example, argon gas or krypton gas as a rare gas, fluorine gas as a halogen gas, and neon gas as a buffer gas.
- the power supply 12 includes a switch 13 and is connected to the discharge electrode 11a and a charger (not shown).
- the band narrowing module 14 includes a plurality of prisms 14a and 14b and a grating 14c.
- the prism 14b is supported by a rotating stage 14e.
- the rotating stage 14e is configured to rotate the prism 14b about an axis parallel to the V-axis in accordance with the drive signal output from the wavelength driver 51.
- FIG. The selected wavelength of the band narrowing module 14 is changed by rotating the prism 14b.
- the spectral waveform adjuster 15a includes a cylindrical plano-convex lens 15b, a cylindrical plano-concave lens 15c, and a linear stage 15d.
- a cylindrical plano-concave lens 15c is positioned between the laser chamber 10 and the cylindrical plano-convex lens 15b.
- the cylindrical plano-convex lens 15b and the cylindrical plano-concave lens 15c are arranged so that the convex surface of the cylindrical plano-convex lens 15b faces the concave surface of the cylindrical plano-concave lens 15c.
- the convex surface of the cylindrical plano-convex lens 15b and the concave surface of the cylindrical plano-concave lens 15c each have a focal axis parallel to the direction of the V-axis.
- a flat surface located on the opposite side of the convex surface of the cylindrical plano-convex lens 15b is coated with a partially reflective film.
- the monitor module 16 is arranged in the optical path of the laser light between the spectral waveform adjuster 15 a and the exposure apparatus 100 .
- the monitor module 16 includes beam splitters 16 a , 16 b and 17 a , an energy sensor 16 c , a highly reflective mirror 17 b , a wavelength detector 18 and a spectroscope 19 .
- the beam splitter 16a is located in the optical path of the laser light output from the spectral waveform adjuster 15a.
- the beam splitter 16a is configured to transmit part of the laser light output from the spectral waveform adjuster 15a toward the exposure apparatus 100 with high transmittance and reflect the other part.
- the beam splitter 16b is located in the optical path of the laser beam reflected by the beam splitter 16a.
- the energy sensor 16c is positioned in the optical path of the laser light reflected by the beam splitter 16b.
- the beam splitter 17a is located on the optical path of the laser light that has passed through the beam splitter 16b.
- the high reflection mirror 17b is positioned in the optical path of the laser beam reflected by the beam splitter 17a.
- the wavelength detector 18 is arranged in the optical path of the laser light that has passed through the beam splitter 17a.
- the wavelength detector 18 includes a diffuser plate 18a, an etalon 18b, a condenser lens 18c, and a line sensor 18d.
- the diffusion plate 18a is positioned on the optical path of the laser light transmitted through the beam splitter 17a.
- the diffusion plate 18a has a large number of irregularities on its surface, and is configured to transmit and diffuse laser light.
- the etalon 18b is positioned in the optical path of the laser light transmitted through the diffuser plate 18a.
- Etalon 18b includes two partially reflective mirrors. The two partially reflecting mirrors face each other with an air gap of a predetermined distance, and are bonded together via spacers.
- the condenser lens 18c is positioned on the optical path of the laser beam that has passed through the etalon 18b.
- the line sensor 18d is located on the focal plane of the condenser lens 18c on the optical path of the laser beam that has passed through the condenser lens 18c.
- the line sensor 18d is a light distribution sensor including a large number of light receiving elements arranged one-dimensionally.
- an image sensor including a large number of light receiving elements arranged two-dimensionally may be used as the light distribution sensor.
- the line sensor 18d may have a processor (not shown).
- the line sensor 18d receives interference fringes formed by the etalon 18b and the condenser lens 18c.
- An interference fringe is an interference pattern of laser light and has a shape of concentric circles, and the square of the distance from the center of the concentric circles is proportional to the change in wavelength.
- a processor (not shown) may be configured to statistically process and output data reflecting the interference pattern.
- the spectroscope 19 is arranged in the optical path of the laser beam reflected by the high reflection mirror 17b.
- the spectroscope 19 includes a diffuser plate 19a, an etalon 19b, a condenser lens 19c, and a line sensor 19d.
- the line sensor 19d may have a processor (not shown). These configurations are the same as those of the diffuser plate 18a, etalon 18b, condenser lens 18c, and line sensor 18d included in the wavelength detector 18, respectively.
- etalon 19b has a smaller free spectral range than etalon 18b.
- the condenser lens 19c has a longer focal length than the condenser lens 18c.
- the spectrum measurement control processor 60 is a processing device including a memory 61 storing a control program, a CPU 62 executing the control program, and a counter 63 .
- Spectral instrumentation control processor 60 is specially configured or programmed to perform various processes contained in this disclosure.
- Spectrum measurement control processor 60 corresponds to the processor in the present disclosure.
- the memory 61 also stores various data for calculating spectral line widths.
- Various data include the device function S( ⁇ ) of the spectroscope 19 .
- the counter 63 counts the number of pulses of the laser light by counting the number of times the electrical signal containing the data of the pulse energy output from the energy sensor 16c is received. Alternatively, the counter 63 may count the number of pulses of laser light by counting oscillation trigger signals output from the laser control processor 30 .
- the wavelength measurement control unit 50 is a processing device including a memory (not shown) storing a control program, a CPU (not shown) that executes the control program, and a counter (not shown).
- a counter included in the wavelength measurement control unit 50 also counts the number of pulses of laser light, like the counter 63 .
- the laser control processor 30, the wavelength measurement control unit 50, and the spectrum measurement control processor 60 are described as separate components, but the laser control processor 30 includes the wavelength measurement control unit 50 and the spectrum measurement control. It may also serve as the processor 60 .
- the laser control processor 30 receives setting data for the target pulse energy and target wavelength of laser light from the exposure control processor 110 included in the exposure apparatus 100 .
- Laser control processor 30 receives a trigger signal from exposure control processor 110 .
- the laser control processor 30 transmits setting data for the voltage applied to the discharge electrode 11a to the power supply 12 based on the target pulse energy.
- the laser control processor 30 transmits target wavelength setting data to the wavelength measurement control unit 50 .
- the laser control processor 30 transmits an oscillation trigger signal based on the trigger signal to the switch 13 included in the power supply 12 .
- the switch 13 is turned on when receiving an oscillation trigger signal from the laser control processor 30 .
- the power supply 12 When the switch 13 is turned on, the power supply 12 generates a pulsed high voltage from electric energy charged in a charger (not shown) and applies this high voltage to the discharge electrode 11a.
- a discharge occurs inside the laser chamber 10 when a high voltage is applied to the discharge electrode 11a.
- the energy of this discharge excites the laser medium inside the laser chamber 10 to shift to a high energy level.
- the excited laser medium shifts to a lower energy level, it emits light with a wavelength corresponding to the energy level difference.
- Light generated inside the laser chamber 10 is emitted to the outside of the laser chamber 10 through windows 10a and 10b.
- Light emitted from the window 10a of the laser chamber 10 is expanded in beam width by the prisms 14a and 14b and enters the grating 14c.
- Light incident on the grating 14c from the prisms 14a and 14b is reflected by the plurality of grooves of the grating 14c and diffracted in directions corresponding to the wavelength of the light.
- Prisms 14a and 14b reduce the beam width of the diffracted light from grating 14c and return the light to laser chamber 10 through window 10a.
- the spectral waveform adjuster 15a transmits and outputs part of the light emitted from the window 10b of the laser chamber 10 and reflects another part back into the laser chamber 10 through the window 10b.
- the light emitted from the laser chamber 10 reciprocates between the band narrowing module 14 and the spectral waveform adjuster 15a, and is amplified every time it passes through the discharge space inside the laser chamber 10. This light is band-narrowed each time it is folded back by the band-narrowing module 14 .
- the laser-oscillated and narrow-band light is output as laser light from the spectral waveform adjuster 15a.
- a linear stage 15d included in the spectrum waveform adjuster 15a moves the cylindrical plano-concave lens 15c along the optical path between the laser chamber 10 and the cylindrical plano-convex lens 15b according to the drive signal output from the spectrum driver 64.
- the wavefront of the light traveling from the spectral waveform adjuster 15a to the band narrowing module 14 changes.
- a change in the wavefront causes a change in the spectral waveform and spectral linewidth of the laser light.
- the energy sensor 16 c detects the pulse energy of the laser light and outputs pulse energy data to the laser control processor 30 , the wavelength measurement control section 50 and the spectrum measurement control processor 60 .
- the pulse energy data is used by the laser control processor 30 to feedback-control setting data for the applied voltage applied to the discharge electrode 11a.
- the electrical signal containing the pulse energy data can be used by the wavelength measurement controller 50 and the spectrum measurement control processor 60 to count the number of pulses, respectively.
- the wavelength detector 18 generates interference fringe waveform data from the amount of light in each of the light receiving elements included in the line sensor 18d.
- the wavelength detector 18 may use an integrated waveform obtained by integrating the amount of light in each of the light receiving elements as the waveform data of the interference fringes.
- the wavelength detector 18 may generate an integrated waveform a plurality of times, and use an average waveform obtained by averaging the multiple integrated waveforms as the waveform data of the interference fringes.
- the wavelength detector 18 transmits the waveform data of the interference fringes to the wavelength measurement control section 50 according to the data output trigger output from the wavelength measurement control section 50 .
- the spectroscope 19 generates a raw waveform reflecting the amount of light in each of the light receiving elements included in the line sensor 19d that received the interference fringes.
- the spectroscope 19 generates an integrated waveform Oi by integrating the raw waveform over Ni pulses.
- the spectroscope 19 generates the integrated waveform Oi Na times, and generates an average waveform Oa by averaging the Na integrated waveforms Oi.
- the integrated pulse number Ni is, for example, 5 pulses or more and 8 pulses or less, and the average number of times Na is, for example, 5 times or more and 8 times or less.
- the spectrum measurement control processor 60 counts the integrated pulse number Ni and the averaged number Na, and the spectroscope 19 may generate the integrated waveform Oi and the average waveform Oa according to the trigger signal output from the spectrum measurement control processor 60 .
- the memory 61 of the spectrum measurement control processor 60 may store setting data for the number of integrated pulses Ni and the number of times of averaging Na. At least one of the raw waveform, integrated waveform Oi, and average waveform Oa corresponds to the measured waveform in the present disclosure.
- the spectroscope 19 extracts a partial waveform corresponding to the free spectral range from the average waveform Oa.
- the extracted part of the waveform shows the relationship between the distance from the center of the concentric circles forming the interference fringes and the light intensity.
- the spectroscope 19 acquires the measured spectral waveform O( ⁇ ) by coordinate-converting this waveform into the relationship between the wavelength and the light intensity. Coordinate transformation of a part of the average waveform Oa into the relationship between the wavelength and the light intensity is also called mapping to the spectral space.
- the measured spectral waveform O( ⁇ ) corresponds to the second spectral waveform in this disclosure.
- the spectroscope 19 transmits the measured spectrum waveform O( ⁇ ) to the spectrum measurement control processor 60 according to the data output trigger output from the spectrum measurement control processor 60 .
- Any or all of the calculation processing of the integrated waveform Oi, the calculation processing of the average waveform Oa, and the processing of acquiring the measured spectrum waveform O( ⁇ ) by mapping to the spectral space are performed by the spectroscope 19, but the spectrum measurement control is performed. Processor 60 may do so. Both the process of generating the average waveform Oa and the process of acquiring the measured spectrum waveform O( ⁇ ) may be performed by the spectrum measurement control processor 60 instead of the spectroscope 19 .
- the wavelength measurement control unit 50 receives target wavelength setting data from the laser control processor 30 .
- the wavelength measurement control unit 50 also calculates the center wavelength of the laser light using the waveform data of the interference fringes output from the wavelength detector 18 .
- the wavelength measurement control unit 50 feedback-controls the center wavelength of the laser light by outputting a control signal to the wavelength driver 51 based on the target wavelength and the calculated center wavelength.
- Spectrum measurement control processor 60 Spectral measurement control processor 60 receives measured spectral waveform O( ⁇ ) from spectrometer 19 .
- spectral instrumentation control processor 60 may receive raw waveforms from spectrometer 19, integrate and average the raw waveforms, map them into spectral space, and obtain a measured spectral waveform O( ⁇ ).
- the spectrum measurement control processor 60 may receive the integrated waveform Oi from the spectroscope 19, average the integrated waveform Oi, map it to the spectral space, and acquire the measured spectral waveform O( ⁇ ).
- the spectral instrumentation control processor 60 may receive the average waveform Oa from the spectrometer 19 and map the average waveform Oa to the spectral space to obtain the measured spectral waveform O( ⁇ ).
- the spectrum measurement control processor 60 calculates the estimated spectrum waveform I( ⁇ ) from the measured spectrum waveform O( ⁇ ) as follows.
- FIG. 3 is a block diagram illustrating functions of the spectrum measurement control processor 60 in the comparative example.
- the spectroscope 19 has instrument-specific measurement characteristics, which are represented by an instrument function S( ⁇ ) as a function of the wavelength ⁇ .
- an instrument function S( ⁇ ) as a function of the wavelength ⁇ .
- the measured spectral waveform O( ⁇ ) is given by the following equation 1: It is represented by the convolution integral of the unknown spectrum waveform T( ⁇ ) and the instrument function S( ⁇ ) as follows.
- a convolution integral means a composite product of two functions.
- the convolution integral can be expressed using the symbol * as follows.
- O( ⁇ ) T( ⁇ )*S( ⁇ )
- the Fourier transform F(O( ⁇ )) of the measured spectral waveform O( ⁇ ) is the Fourier transform F(T( ⁇ )) and F(S ( ⁇ )).
- F(O( ⁇ )) F(T( ⁇ )) ⁇ F(S( ⁇ )) This is called the convolution theorem.
- the spectrum measurement control processor 60 measures the instrument function S( ⁇ ) of the spectroscope 19 in advance and stores it in the memory 61 .
- coherent light having a wavelength substantially the same as the central wavelength of the laser light output from the laser device 1 and having a narrow spectral line width that can be regarded as a ⁇ function. is incident on the spectroscope 19 .
- the spectral waveform of the coherent light measured by the spectroscope 19 can be used as the device function S( ⁇ ).
- the CPU 62 included in the spectrum measurement control processor 60 deconvolves the measured spectrum waveform O( ⁇ ) of the laser light with the device function S( ⁇ ) of the spectroscope 19 .
- Deconvolution refers to the computational process of estimating an unknown function that satisfies the convolution equation.
- a waveform obtained by deconvolution is assumed to be an estimated spectral waveform I( ⁇ ).
- the estimated spectral waveform I( ⁇ ) corresponds to the first spectral waveform in the present disclosure, and shows the relationship between the wavelength and light intensity of the estimated unknown spectral waveform T( ⁇ ).
- the deconvolution integral using the Fourier transform and the inverse Fourier transform is susceptible to noise components contained in the measurement data. Therefore, it is desirable to calculate the deconvolution integral using an iterative method such as the Jacobi method or the Gauss-Seidel method that can suppress the influence of noise components.
- FIG. 4 is a flow chart showing the procedure for measuring the spectral line width E95 in the comparative example.
- the spectrum measurement control processor 60 generates an integrated waveform Oi and an average waveform Oa from the interference pattern of laser light as follows, and calculates an estimated spectrum waveform I( ⁇ ) and a spectrum line width E95.
- a definition of the spectral linewidth E95 will be described later with reference to FIG.
- the spectrum measurement control processor 60 reads the integrated pulse number Ni and the averaging number Na from the memory 61 .
- the spectrum measurement control processor 60 receives the raw waveform reflecting the amount of light in each of the light receiving elements included in the line sensor 19d, and integrates over Ni pulses to generate an integrated waveform Oi.
- the spectrum measurement control processor 60 generates the integrated waveform Oi Na times, and generates the average waveform Oa by averaging the Na integrated waveforms Oi.
- the spectrum measurement control processor 60 generates the measured spectrum waveform O( ⁇ ) by mapping the average waveform Oa into the spectrum space.
- the spectrum measurement control processor 60 reads the instrument function S( ⁇ ) of the spectroscope 19 from the memory 61 .
- the spectral measurement control processor 60 calculates the estimated spectral waveform I( ⁇ ) by deconvoluting the measured spectral waveform O( ⁇ ) with the device function S( ⁇ ).
- the spectral measurement control processor 60 calculates spectral line width E95 from the estimated spectral waveform I( ⁇ ). The calculated spectral linewidth may not be E95, and may be the full width at half maximum.
- the spectrum measurement control processor 60 ends the processing of this flowchart.
- the spectral measurement control processor 60 receives the target value of the spectral linewidth E95 from the exposure control processor 110 via the laser control processor 30. Based on the target value of the spectral linewidth E95 and the calculated spectral linewidth E95, the spectral measurement control processor 60 transmits a control signal to the spectrum driver 64 to control the spectral waveform adjuster 15a, thereby adjusting the spectral linewidth E95 is feedback controlled.
- FIG. 5 is a graph showing an example of an estimated spectral waveform I( ⁇ ) of laser light.
- the horizontal axis of FIG. 5 indicates the wavelength deviation ⁇ from the center wavelength.
- the estimated spectrum waveform I( ⁇ ) is a waveform that indicates the light intensity for each wavelength component included in the wavelength range of the estimated spectrum waveform I( ⁇ ).
- a value obtained by integrating the estimated spectral waveform I( ⁇ ) in a certain wavelength range is called spectral energy in that wavelength range.
- the full width of the portion that occupies 95% of the spectral energy of the entire wavelength range of the estimated spectral waveform I( ⁇ ) is called spectral line width E95.
- FIG. 5 shows an estimated spectral waveform I( ⁇ ) of laser light with a spectral linewidth E95 of 0.3 pm. Since the angle of refraction on the surface of the lens differs depending on the wavelength of the laser light, the exposure performance of the exposure apparatus 100 differs if the spectrum waveform differs. Exposure performance can be stabilized by controlling the spectral linewidth E95 based on the target value.
- FIG. 6 is a graph showing another example of the spectrum waveform of laser light.
- the horizontal axis of FIG. 6 indicates the wavelength deviation ⁇ from the center wavelength.
- the spectral line widths E95 of spectral waveforms #1 to #3 shown in FIG. 6 are all 0.3 pm, but these spectral waveforms #1 to #3 have different shapes.
- Spectral waveform #1 is a spectral distribution in which the center wavelength and peak wavelength match.
- Spectral waveform #2 is an asymmetric spectral distribution in which the peak wavelength is shifted to the longer wavelength side than the center wavelength.
- the center wavelength here is, for example, the center of the wavelength width having a light intensity of 1/e 2 or more of the peak intensity.
- Spectral waveform #3 is a symmetric spectral distribution with two separate peak wavelengths.
- FIG. 7 to 9 are graphs showing the focus position distribution in the exposure apparatus 100 of the laser light shown by the spectrum waveforms #1 to #3 shown in FIG. 7 to 9, the vertical axis indicates the focus position along the Z-axis shown in FIG. 1, and the horizontal axis indicates the light intensity of the wavelength component focused on each focus position.
- the longitudinal chromatic aberration of the projection optical system 102 of the exposure apparatus 100 is 250 nm/pm. That is, the difference in focus position per wavelength difference of 1 pm is assumed to be 250 nm.
- the distribution shapes of the focus positions shown in FIGS. 7 to 9 almost directly correspond to the shapes of the spectrum waveforms #1 to #3 shown in FIG.
- the peak of the focused wavelength component has a distribution shape separated at two positions.
- FIGS. 10 and 11 are graphs showing still other examples of spectral waveforms of laser light.
- the horizontal axis indicates the wavelength deviation ⁇ from the central wavelength.
- the spectral line widths E95 of spectral waveforms #4 to #6 shown in FIG. 10 and spectral waveforms #7 to #9 shown in FIG. 11 are all 0.3 pm, but these spectral waveforms #4 to #9 They differ in shape from each other.
- Spectral waveforms #4 to #6 have an asymmetrical spectral distribution in which the peak wavelength is shifted to the longer wavelength side than the center wavelength, and the difference between the center wavelength and the peak wavelength is different from each other.
- Spectral waveforms #7 to #9 are symmetrical, but spectral waveform #7 has a gentler curve near the peak than spectral waveform #1 (see FIG. 6) having a Gaussian distribution.
- Spectral waveforms #8 and #9 have spectral distributions in which the peak wavelengths are separated into two, and the difference between the center wavelength and the peak wavelength is different from each other.
- FIG. 12 shows a rectangular imaging pattern used for evaluation of imaging performance.
- a mask designed to form a rectangular imaging pattern with a horizontal dimension of 38 nm and a vertical dimension of 76 nm on the wafer surface by the projection optical system 102 was used when Gaussian-distributed spectral waveform #1 was used.
- the longitudinal chromatic aberration of the projection optical system 102 was set to 250 nm/pm.
- the spectral waveforms #4 to #9 were used, the deviation ⁇ CD of the vertical dimension from 76 nm was obtained by simulation when the exposure amount was adjusted so that the horizontal dimension of the imaged pattern on the wafer surface was 38 nm. .
- FIG. 13 and 14 are graphs showing simulation results of the imaging performance of the exposure apparatus 100.
- FIG. FIG. 13 shows the case of using spectral waveforms #4 to #6 shown in FIG. 10, and FIG. 14 shows the case of using spectral waveforms #7 to #9 shown in FIG.
- the greater the difference between the center wavelength and the peak wavelength and the greater the asymmetry the greater the dimensional error on the wafer surface.
- the greater the difference from the Gaussian distribution the greater the dimensional error on the wafer surface.
- the imaging performance in the exposure apparatus 100 may differ, and the required exposure performance may not be obtained simply by matching the spectral linewidth E95 to the target value. obtain.
- waveform evaluation is performed in consideration of not only the spectral line width but also the shape of the spectral waveform, thereby enabling spectrum control to obtain the required exposure performance.
- FIG. 15 schematically shows the configuration of a laser device 1a according to an embodiment of the present disclosure.
- the memory 61 included in the spectrum measurement control processor 60 stores a spectrum evaluation value calculation program 611 .
- the spectrum measurement control processor 60 performs the following calculations.
- the spectrum measurement control processor 60 calculates the centroid wavelength ⁇ c of the estimated spectrum waveform I( ⁇ ) using Equation 2 below.
- the numerator of Formula 2 is a value obtained by integrating the product of the light intensity indicated by the estimated spectral waveform I( ⁇ ) and the wavelength ⁇ with respect to the wavelength range of the estimated spectral waveform I( ⁇ ). corresponds to an integral value of 2.
- the denominator of Equation 2 is a value obtained by integrating the light intensity indicated by the estimated spectral waveform I( ⁇ ) with respect to the wavelength region of the estimated spectral waveform I( ⁇ ), and corresponds to the third integral value in the present disclosure. do.
- the centroid wavelength ⁇ c is an example of a representative wavelength in the present disclosure.
- the spectrum measurement control processor 60 calculates the spectrum evaluation value V of the estimated spectrum waveform I( ⁇ ) using Equation 3 below.
- the numerator of Equation 3 integrates the product of the light intensity indicated by the estimated spectral waveform I( ⁇ ) and the function ( ⁇ c) 2 of the wavelength deviation from the centroid wavelength ⁇ c with respect to the wavelength region of the estimated spectral waveform I( ⁇ ). and corresponds to the first integral value in the present disclosure.
- the spectrum evaluation value V corresponds to the evaluation value in the present disclosure.
- the denominator of Equation 3 is the product of the constant ⁇ s and the third integral value.
- the constant ⁇ s may be any one of (1) to (4) below.
- (1) 1 Centroid wavelength ⁇ c (3) Spectral line width E95 of estimated spectral waveform I( ⁇ ) (4) standard deviation of the Gaussian distribution shape spectral waveform having the same spectral line width E95 as the estimated spectral waveform I( ⁇ )
- the spectrum evaluation value V is the dimension of the square of the wavelength ⁇ , whereas the function of the wavelength ⁇ as in (2) to (4) above By dividing by the constant ⁇ s obtained from , the spectrum evaluation value V can be made the dimension of the wavelength ⁇ .
- FIG. 16 is a flowchart showing the procedure for measuring the spectrum evaluation value V in the embodiment.
- the processing of S331 to S336 in FIG. 16 is the same as the corresponding processing in FIG.
- the spectrum measurement control processor 60 advances the process to S338.
- the spectrum measurement control processor 60 calculates the barycenter wavelength ⁇ c of the estimated spectrum waveform I( ⁇ ) using Equation (2).
- the spectrum measurement control processor 60 calculates the spectrum evaluation value V of the estimated spectrum waveform I( ⁇ ) using Equation (3).
- the spectrum measurement control processor 60 ends the processing of this flowchart.
- FIG. 17 shows an imaging pattern used for comparison of usefulness of spectral evaluation value V and spectral line width E95.
- the imaging patterns shown in FIG. 17 include two types of patterns, a DENCE pattern in which a plurality of exposure areas are densely arranged, and an ISO pattern in which the exposure areas are separated from other exposure areas.
- ⁇ CD be the deviation from the standard dimension of the ISO pattern when the exposure amount is adjusted so that the dimension of the DENCE pattern is 45 nm.
- the standard dimension of the ISO pattern is the dimension of the ISO pattern when the spectral line width E95 is 0.01 pm.
- FIG. 18 is a graph showing the relationship between the spectral line width E95 and ⁇ CD in the imaging pattern of FIG. 17, and FIG. 19 is a graph showing the relationship between the spectral evaluation value V and ⁇ CD in the imaging pattern of FIG. be.
- simulations were performed using a number of variations including the spectral waveforms illustrated in FIGS. 10 and 11, and ⁇ CD was plotted.
- FIG. 18 two trends are observed in the rate of change in ⁇ CD with respect to change in spectral linewidth E95. Therefore, even if the spectral line width E95 is measured, it may not be possible to accurately know the imaging performance on the wafer surface.
- the relationship between the spectral evaluation value V and ⁇ CD is substantially linear. Therefore, by measuring the spectrum evaluation value V, it is possible to know the imaging performance on the wafer surface. By controlling the spectral evaluation value V to a constant target evaluation value, the required imaging performance can be achieved.
- FIG. 20 shows another imaging pattern used to compare the usefulness of spectral evaluation value V and spectral line width E95.
- the imaging patterns shown in FIG. 20 include two types of patterns, a LINE pattern imitating wiring and a SPACE pattern imitating a gap between adjacent wirings.
- ⁇ CD be the deviation of the SPACE pattern from the standard dimension when the exposure amount is adjusted so that the dimension of the LINE pattern is 100 nm.
- FIG. 21 is a graph showing the relationship between the spectral line width E95 and ⁇ CD in the imaging pattern of FIG. 20, and FIG. 22 is a graph showing the relationship between the spectral evaluation value V and ⁇ CD in the imaging pattern of FIG. be.
- simulations were performed using a number of variations including the spectral waveforms illustrated in Figures 10 and 11, and ⁇ CD was plotted.
- Equation 3 the square of the wavelength deviation ⁇ c from the centroid wavelength ⁇ c ( ⁇ c) 2 is used, but the present disclosure is not limited to this.
- the spectrum evaluation value V may be calculated by Equation 4 below.
- Equation 4 differs from Equation 3 in that instead of squaring the wavelength deviation ⁇ c in Equation 3, the absolute value of the wavelength deviation ⁇ c is raised to the Nth power.
- the exponent N is a positive number. Equation 4 when the exponent N is set to 2 is equivalent to Equation 3 when ⁇ s is set to 1.
- FIG. 23 is a graph showing the relationship between the spectral evaluation value V of Equation 4 and ⁇ CD in the imaging pattern of FIG.
- FIG. 24 is a graph showing the relationship between the spectral evaluation value V of Equation 4 and ⁇ CD in the imaging pattern of FIG.
- the simulation results when the value of the exponent N in Equation 4 is 1, 2, and 3 are shown together with the respective regression lines.
- a correlation is recognized between the spectrum evaluation value V and ⁇ CD in any case where the value of the exponent N is set to 1, 2, or 3.
- the coefficient of determination which indicates the goodness of fit of the regression line, is the highest when the value of the exponent N is 2 in both FIGS. It is preferable that the value of exponent N be 1.9 or more and 2.1 or less.
- FIG. 25 is a flow chart showing the procedure of spectrum control in the embodiment.
- the spectrum measurement control processor 60 controls the spectrum waveform adjuster 15a using the spectrum evaluation value V and the target evaluation value Vt as follows.
- the spectrum measurement control processor 60 sets the target evaluation value Vt.
- the spectral measurement control processor 60 receives data on the optical characteristics of the exposure apparatus 100 from the exposure apparatus 100 and sets the target evaluation value Vt calculated from this optical characteristic.
- the spectrum measurement control processor 60 determines whether an oscillation trigger signal has been output from the laser control processor 30 . If the oscillation trigger signal has not been output (S32: NO), the spectrum measurement control processor 60 waits until the oscillation trigger signal is output. When the oscillation trigger signal is output (S32: YES), the laser oscillator 20 outputs laser light. The spectrum measurement control processor 60 advances the process to S33.
- the spectrum measurement control processor 60 measures the spectrum evaluation value V using the laser light output from the laser oscillator 20 .
- the processing of S33 is performed according to the procedure described with reference to FIG.
- the spectrum measurement control processor 60 compares the spectrum evaluation value V with the target evaluation value Vt, and determines whether the spectrum evaluation value V is within the allowable range. For example, it is determined whether or not the absolute value of the difference between the spectrum evaluation value V and the target evaluation value Vt is smaller than the allowable error Ve.
- the spectrum measurement control processor 60 proceeds to S35.
- the spectrum measurement control processor 60 controls the spectrum waveform adjuster 15 a by transmitting a control signal to drive the spectrum driver 64 .
- the spectrum waveform adjuster 15a is controlled to reduce the spectrum line width
- the spectrum waveform adjuster 15a is controlled to reduce the spectrum line width.
- the spectral waveform adjuster 15a is controlled to increase the line width.
- the spectrum measurement control processor 60 terminates the processing of this flowchart. Thereafter, the laser device 1a continues to output laser light while fixing the setting of the spectrum waveform adjuster 15a. Alternatively, the spectrum measurement control processor 60 may return the process to S32 and repeat measurement and determination of the spectrum evaluation value V while continuing to output laser light.
- FIGS. 26 and 27 schematically show the configuration of a variant of the spectral waveform adjuster.
- the band narrowing device 141 constitutes a spectral waveform adjuster.
- 26 shows the band narrowing device 141 viewed in the -V direction
- FIG. 27 shows the band narrowing device 141 viewed in the -H direction.
- Band narrowing device 141 includes a grating system 14h instead of grating 14c (see FIG. 2).
- Grating system 14h includes gratings 14i and 14j.
- the gratings 14i and 14j are arranged at different positions in the V-axis direction. The direction of each groove of the gratings 14i and 14j coincides with the direction of the V-axis.
- the gratings 14i and 14j are supported by a holder 14k. However, the grating 14i is supported so as to maintain a fixed posture, while the grating 14j is rotatable about an axis parallel to the V-axis by a rotating mechanism 14m.
- the band narrowing device 141 includes a beam splitting optical system 14n between the prism 14b and the grating system 14h.
- the beam splitting optical system 14n includes a plane-parallel substrate 14o.
- the plane-parallel substrate 14o is arranged so as to partially overlap the cross section of the optical path of the light beam that has passed through the prism 14b.
- a plane-parallel substrate 14o is placed in the optical path of the light beam between the prism 14b and the grating 14j.
- a parallel plane substrate 14o is supported by a holder 14p.
- the plane-parallel substrate 14o is configured to be movable in a direction parallel to the V-axis by a linear stage 14q.
- the plane-parallel substrate 14o has an incident surface 14r on which part of the light beam that has passed through the prism 14b is incident, and the light incident on the plane-parallel substrate 14o through the incident surface 14r is directed from the inside of the plane-parallel substrate 14o toward the grating 14j. and an exit surface 14s for exiting through. Both the entrance surface 14r and the exit surface 14s are parallel to the H-axis, and the entrance surface 14r and the exit surface 14s are parallel to each other. The entrance surface 14r and the exit surface 14s are inclined with respect to the incident direction of the light beam so as to refract the light beam.
- the normal vector 14v of the incident surface 14r is parallel to the VZ plane, and the normal vector 14v has directional components in the -V and +Z directions.
- the plane-parallel substrate 14o further includes an end surface 14t facing the first portion B1 of the light beam.
- the end surface 14t forms an acute angle with the exit surface 14s.
- the end face 14t may be parallel to the HZ plane.
- the prism 14a is supported by a holder 14f.
- Prism 14b is supported by holder 14g.
- the prism 14b may be directly supported by the rotating stage 14e without the holder 14g, as in FIG.
- a first portion B1 of the light beam that has passed through the prism 14b passes outside the plane-parallel substrate 14o and enters the grating 14i.
- a second portion B2 of the light beam is transmitted through the parallel plane substrate 14o and enters the grating 14j.
- the plane-parallel substrate 14o shifts the optical path axis of the second portion B2 of the light beam in the +V direction with respect to the optical path axis of the first portion B1.
- the optical path axis means the central axis of the optical path.
- the plane-parallel substrate 14o separates the second portion B2 from the first portion B1 of the light beam by transmitting a portion of the light beam.
- the light incident on the gratings 14i and 14j is reflected by the plurality of grooves of each of the gratings 14i and 14j and diffracted in directions corresponding to the wavelength of the light.
- the light reflected by the plurality of grooves of each of the gratings 14i and 14j is dispersed within the plane parallel to the HZ plane.
- the grating 14i is arranged in a Littrow arrangement so that the incident angle of the light beam incident on the grating 14i from the prism 14b and the diffraction angle of the desired diffracted light of the first wavelength match.
- the grating 14j is Littrow arranged so that the incident angle of the light beam incident on the grating 14j from the prism 14b and the diffraction angle of the diffracted light of the desired second wavelength match.
- the incident angles of the light beams incident on the gratings 14i and 14j from the prism 14b are different from each other, the first wavelength of the diffracted light returned from the grating 14i to the prism 14b and the second wavelength of the diffracted light returned to the prism 14b from the grating 14j.
- the dashed arrows indicating the light beams indicate only the direction from the prism 14a to the gratings 14i and 14j. from the gratings 14i and 14j to the prism 14a.
- Prisms 14a and 14b reduce the beam width of the light returned from gratings 14i and 14j in a plane parallel to the HZ plane and redirect the light into the laser chamber through window 10a (see FIGS. 2 and 15). Return within 10.
- the rotating mechanism 14m slightly rotates the grating 14j the incident angle of the light beam entering the grating 14i from the prism 14b does not change, but the incident angle of the light beam entering the grating 14j from the prism 14b slightly changes. Therefore, the wavelength difference between the first wavelength and the second wavelength changes.
- the first wavelength and the second wavelength of the light beam emitted from the window 10a of the laser chamber 10 are selected and returned into the laser chamber 10.
- the laser device 1a can output laser light including two peak wavelengths.
- the first wavelength and the second wavelength can be set separately.
- the linear stage 14q changes the position of the plane-parallel substrate 14o in the direction of the V-axis, thereby changing the energy ratio between the first portion B1 and the second portion B2.
- the amount of light incident on the grating 14j increases. Therefore, the energy of the second wavelength component contained in the laser light is increased.
- By moving the plane-parallel substrate 14o in the +V direction to reduce the second portion B2 of the light beam incident on the plane-parallel substrate 14o less light is incident on the grating 14j. Therefore, the energy of the second wavelength component contained in the laser light is reduced.
- laser light including two peak wavelengths illustrated in FIG. 11 and laser light having an asymmetric spectral waveform illustrated in FIG. 10 can be output, and the spectral waveform of the laser light can be controlled. .
- the prism 14b is replaced with a first prism (not shown) arranged at positions different from each other in the V direction.
- a second prism may be substituted.
- a first mirror and a second mirror are placed between the prism 14b and the grating 14c. They may be arranged at different positions in the V direction.
- the first and second wavelengths can be individually controlled.
- the energy ratio between the first wavelength component and the second wavelength component can be controlled by making the first mirror and the second mirror integrally movable in the direction parallel to the V-axis.
- the laser device 1a connectable to the exposure device 100 includes the spectroscope 19 that obtains the average waveform Oa from the interference pattern of the laser light output from the laser device 1a. and a spectrum measurement control processor 60 .
- the spectral measurement control processor 60 calculates an estimated spectral waveform I( ⁇ ) representing the relationship between the wavelength ⁇ and the light intensity using the average waveform Oa, and calculates a representative wavelength included in the wavelength range of the estimated spectral waveform I( ⁇ ).
- the spectral measurement control processor 60 maps the average waveform Oa to the spectral space to generate the measured spectral waveform O( ⁇ ), and maps the measured spectral waveform O( ⁇ ) to the device of the spectroscope 19.
- An estimated spectrum waveform I( ⁇ ) is calculated by performing deconvolution integration with the function S( ⁇ ). According to this, the influence of the device function S( ⁇ ) of the spectroscope 19 can be removed, and the exposure performance of the exposure device 100 can be properly evaluated.
- the representative wavelength is the centroid wavelength ⁇ c of the estimated spectral waveform I( ⁇ ). This makes it possible to appropriately evaluate the exposure performance of the exposure apparatus 100 even with an asymmetric spectral waveform having a different central wavelength and centroid wavelength ⁇ c.
- the spectrum measurement control processor 60 calculates the second integrated value obtained by integrating the product of the wavelength ⁇ and the light intensity indicated by the estimated spectrum waveform I( ⁇ ) with respect to the wavelength range. , and divides the light intensity indicated by the estimated spectral waveform I( ⁇ ) by the third integrated value obtained by integrating the wavelength region, thereby calculating the centroid wavelength ⁇ c. According to this, the exposure performance of the exposure apparatus 100 can be evaluated appropriately even with an asymmetric spectral waveform having different center wavelengths and centroid wavelengths ⁇ c, or a spectral waveform with a plurality of peaks.
- the function of the wavelength deviation ⁇ - ⁇ c is the power of the absolute value
- V the spectrum evaluation value
- the exponent N is 1.9 or more and 2.1 or less. According to this, the exposure performance of the exposure apparatus 100 can be evaluated more appropriately using the spectrum evaluation value V.
- FIG. 1 the spectrum evaluation value V.
- the spectrum measurement control processor 60 calculates the spectrum evaluation value V by dividing the first integral value by the third integral value. According to this, by dividing by the third integral value, it is possible to evaluate the exposure performance according to the spectral waveform regardless of the amount of light.
- the spectrum measurement control processor 60 divides the first integrated value by the product of the third integrated value and a constant ⁇ s obtained from a function of the wavelength ⁇ included in the wavelength range. , the spectral evaluation value V is calculated. According to this, the dimension of the wavelength ⁇ included in the spectrum evaluation value V can be lowered to appropriately evaluate the exposure performance.
- the spectral waveform adjuster 15a that adjusts the spectral waveform of the laser light incident on the spectroscope 19 is further provided.
- the spectrum measurement control processor 60 controls the spectrum waveform adjuster 15a using the comparison result between the spectrum evaluation value V and the target evaluation value Vt. According to this, the required exposure performance can be realized by the control using the spectrum evaluation value V and the target evaluation value Vt.
- the spectral waveform adjuster 15a is configured to adjust the spectral linewidth of the laser light.
- the spectrum measurement control processor 60 controls the spectrum waveform adjuster 15a so as to reduce the spectral line width when the spectrum evaluation value V is greater than the target evaluation value Vt, and when the spectrum evaluation value V is less than the target evaluation value Vt.
- the spectral waveform adjuster 15a is controlled so as to increase the spectral line width. According to this, the spectral evaluation value V can be decreased by decreasing the spectral line width, and the spectral evaluation value V can be increased by increasing the spectral line width.
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Abstract
Description
1.比較例
1.1 露光装置100の構成
1.2 露光装置100の動作
1.3 レーザ装置1の構成
1.3.1 レーザ発振器20
1.3.2 モニタモジュール16
1.3.3 各種処理装置
1.4 動作
1.4.1 レーザ制御プロセッサ30
1.4.2 レーザ発振器20
1.4.3 モニタモジュール16
1.4.4 波長計測制御部50
1.4.5 スペクトル計測制御プロセッサ60
1.5 比較例の課題
2.推定スペクトル波形I(λ)と波長偏差の関数(λ-λc)2との積を積分してスペクトル評価値Vを算出するレーザ装置1a
2.1 構成
2.2 スペクトル評価値Vの計測動作
2.3 スペクトル線幅E95との比較
2.4 スペクトル評価値Vの変形例
2.5 スペクトル制御の動作
2.6 スペクトル波形調整器の変形例
2.6.1 構成
2.6.2 動作
2.6.3 他の構成例
2.7 作用
3.その他
図1は、比較例における露光システムの構成を概略的に示す。本開示の比較例とは、出願人のみによって知られていると出願人が認識している形態であって、出願人が自認している公知例ではない。
露光装置100は、照明光学系101と、投影光学系102と、露光制御プロセッサ110と、を含む。
照明光学系101は、レーザ装置1から入射したレーザ光によって、レチクルステージRT上に配置された図示しないレチクルのレチクルパターンを照明する。
投影光学系102は、レチクルを透過したレーザ光を、縮小投影してワークピーステーブルWT上に配置された図示しないワークピースに結像させる。ワークピースはレジスト膜が塗布された半導体ウエハ等の感光基板である。
露光制御プロセッサ110は、波長の目標値のデータ、パルスエネルギーの目標値のデータ、及びトリガ信号をレーザ制御プロセッサ30に送信する。レーザ制御プロセッサ30は、これらのデータ及び信号に従ってレーザ装置1を制御する。
露光制御プロセッサ110は、レチクルステージRTとワークピーステーブルWTとを同期して互いに逆方向に平行移動させる。これにより、レチクルパターンを反映したレーザ光でワークピースが露光される。
このような露光工程によって半導体ウエハにレチクルパターンが転写される。その後、複数の工程を経ることで電子デバイスを製造することができる。
図2は、比較例に係るレーザ装置1の構成を模式的に示す。レーザ装置1は、レーザ発振器20と、電源12と、モニタモジュール16と、レーザ制御プロセッサ30と、波長計測制御部50と、スペクトル計測制御プロセッサ60と、を含む。レーザ装置1は露光装置100に接続可能とされている。
レーザ発振器20は、レーザチャンバ10と、放電電極11aと、狭帯域化モジュール14と、スペクトル波形調整器15aと、を含む。
狭帯域化モジュール14とスペクトル波形調整器15aとが、レーザ共振器を構成する。レーザチャンバ10は、レーザ共振器の光路に配置されている。レーザチャンバ10の両端にはウインドウ10a及び10bが設けられている。レーザチャンバ10の内部に、放電電極11a及びこれと対をなす図示しない放電電極が配置されている。図示しない放電電極は、紙面に垂直なV軸の方向において放電電極11aと重なるように位置している。レーザチャンバ10には、例えばレアガスとしてアルゴンガス又はクリプトンガス、ハロゲンガスとしてフッ素ガス、バッファガスとしてネオンガス等を含むレーザガスが封入される。
シリンドリカル平凸レンズ15b及びシリンドリカル平凹レンズ15cは、シリンドリカル平凸レンズ15bの凸面とシリンドリカル平凹レンズ15cの凹面とが向かい合うように配置されている。シリンドリカル平凸レンズ15bの凸面とシリンドリカル平凹レンズ15cの凹面はそれぞれV軸の方向に平行な焦点軸を有する。シリンドリカル平凸レンズ15bの凸面の反対側に位置する平らな面は、部分反射膜でコーティングされている。
モニタモジュール16は、スペクトル波形調整器15aと露光装置100との間のレーザ光の光路に配置されている。モニタモジュール16は、ビームスプリッタ16a、16b、及び17aと、エネルギーセンサ16cと、高反射ミラー17bと、波長検出器18と、分光器19と、を含む。
エタロン18bは、拡散プレート18aを透過したレーザ光の光路に位置する。エタロン18bは、2枚の部分反射ミラーを含む。2枚の部分反射ミラーは、所定距離のエアギャップを有して対向し、スペーサを介して貼り合わせられている。
ラインセンサ18dは、集光レンズ18cを透過したレーザ光の光路であって、集光レンズ18cの焦点面に位置する。ラインセンサ18dは、一次元に配列された多数の受光素子を含む光分布センサである。あるいは、ラインセンサ18dの代わりに、二次元に配列された多数の受光素子を含むイメージセンサが光分布センサとして用いられてもよい。ラインセンサ18dは、図示しないプロセッサを備えてもよい。
スペクトル計測制御プロセッサ60は、制御プログラムが記憶されたメモリ61と、制御プログラムを実行するCPU62と、カウンタ63と、を含む処理装置である。スペクトル計測制御プロセッサ60は本開示に含まれる各種処理を実行するために特別に構成又はプログラムされている。スペクトル計測制御プロセッサ60は本開示におけるプロセッサに相当する。
1.4.1 レーザ制御プロセッサ30
レーザ制御プロセッサ30は、レーザ光の目標パルスエネルギー及び目標波長の設定データを露光装置100に含まれる露光制御プロセッサ110から受信する。
レーザ制御プロセッサ30は、露光制御プロセッサ110からトリガ信号を受信する。
スイッチ13は、レーザ制御プロセッサ30から発振トリガ信号を受信するとオン状態となる。電源12は、スイッチ13がオン状態となると、図示しない充電器に充電された電気エネルギーからパルス状の高電圧を生成し、この高電圧を放電電極11aに印加する。
プリズム14a及び14bからグレーティング14cに入射した光は、グレーティング14cの複数の溝によって反射されるとともに、光の波長に応じた方向に回折させられる。
スペクトル波形調整器15aは、レーザチャンバ10のウインドウ10bから出射した光のうちの一部を透過させて出力し、他の一部を反射してウインドウ10bを介してレーザチャンバ10の内部に戻す。
エネルギーセンサ16cは、レーザ光のパルスエネルギーを検出し、パルスエネルギーのデータをレーザ制御プロセッサ30、波長計測制御部50、及びスペクトル計測制御プロセッサ60に出力する。パルスエネルギーのデータは、レーザ制御プロセッサ30が放電電極11aに印加される印加電圧の設定データをフィードバック制御するのに用いられる。また、パルスエネルギーのデータを含む電気信号は、波長計測制御部50及びスペクトル計測制御プロセッサ60がそれぞれパルス数をカウントするのに用いることができる。
波長検出器18は、波長計測制御部50から出力されるデータ出力トリガに従って、干渉縞の波形データを波長計測制御部50に送信する。
積算波形Oiの算出処理、平均波形Oaの算出処理、及びスペクトル空間へのマッピングにより計測スペクトル波形O(λ)を取得する処理のいずれか又はすべてを、分光器19が行うのではなくスペクトル計測制御プロセッサ60が行ってもよい。平均波形Oaを生成する処理と計測スペクトル波形O(λ)を取得する処理との両方を、分光器19が行うのではなくスペクトル計測制御プロセッサ60が行ってもよい。
波長計測制御部50は、目標波長の設定データをレーザ制御プロセッサ30から受信する。また、波長計測制御部50は、波長検出器18から出力される干渉縞の波形データを用いてレーザ光の中心波長を算出する。波長計測制御部50は、目標波長と算出された中心波長とに基づいて波長ドライバ51に制御信号を出力することにより、レーザ光の中心波長をフィードバック制御する。
スペクトル計測制御プロセッサ60は、分光器19から計測スペクトル波形O(λ)を受信する。あるいはスペクトル計測制御プロセッサ60は、分光器19から生波形を受信して、生波形を積算及び平均化し、スペクトル空間へのマッピングを行い、計測スペクトル波形O(λ)を取得してもよい。あるいは、スペクトル計測制御プロセッサ60は、分光器19から積算波形Oiを受信し、積算波形Oiを平均化してスペクトル空間へのマッピングを行い、計測スペクトル波形O(λ)を取得してもよい。あるいは、スペクトル計測制御プロセッサ60は、分光器19から平均波形Oaを受信し、平均波形Oaをスペクトル空間へマッピングして、計測スペクトル波形O(λ)を取得してもよい。
スペクトル計測制御プロセッサ60は、計測スペクトル波形O(λ)から以下のようにして推定スペクトル波形I(λ)を算出する。
分光器19は、装置固有の計測特性を有しており、その計測特性は波長λの関数として装置関数S(λ)で表される。ここで、未知のスペクトル波形T(λ)を有するレーザ光が装置関数S(λ)を有する分光器19に入射して計測された場合の計測スペクトル波形O(λ)は、以下の式1のように未知のスペクトル波形T(λ)と装置関数S(λ)との畳み込み積分で表される。
畳み込み積分は記号*を用いて以下のように表すことができる。
O(λ)=T(λ)*S(λ)
F(O(λ))=F(T(λ))×F(S(λ))
これを畳み込みの定理という。
I(λ)=O(λ)*-1S(λ)
F(I(λ))=F(O(λ))/F(S(λ))
この式の両辺をフーリエ逆変換することにより、逆畳み込み積分の算出結果が得られる。すなわち、フーリエ逆変換の記号をF-1とすると推定スペクトル波形I(λ)は以下のように表される。
I(λ)=F-1(F(O(λ))/F(S(λ)))
S332において、スペクトル計測制御プロセッサ60は、ラインセンサ19dに含まれる受光素子の各々における光量を反映した生波形を受信し、Niパルスにわたって積算することにより、積算波形Oiを生成する。
S333において、スペクトル計測制御プロセッサ60は、積算波形OiをNa回生成し、Na個の積算波形Oiを平均した平均波形Oaを生成する。
S334において、スペクトル計測制御プロセッサ60は、平均波形Oaをスペクトル空間にマッピングすることにより、計測スペクトル波形O(λ)を生成する。
S336において、スペクトル計測制御プロセッサ60は、計測スペクトル波形O(λ)を装置関数S(λ)により逆畳み込み積分することにより、推定スペクトル波形I(λ)を算出する。
S337において、スペクトル計測制御プロセッサ60は、推定スペクトル波形I(λ)からスペクトル線幅E95を算出する。算出されるスペクトル線幅はE95でなくてもよく、半値全幅でもよい。
S337の後、スペクトル計測制御プロセッサ60は、本フローチャートの処理を終了する。
レーザ光の波長に応じてレンズの表面での屈折角が異なるため、スペクトル波形が異なると露光装置100における露光性能が異なってくる。スペクトル線幅E95を目標値に基づいて制御することで、露光性能を安定化し得る。
図6は、レーザ光のスペクトル波形の他の例を示すグラフである。図6の横軸は中心波長からの波長偏差Δλを示す。図6に示されるスペクトル波形#1~#3のスペクトル線幅E95はいずれも0.3pmであるが、これらのスペクトル波形#1~#3は互いに形状が異なる。スペクトル波形#1は中心波長とピーク波長とが一致するスペクトル分布である。スペクトル波形#2は中心波長よりも長波長側にピーク波長がずれた非対称なスペクトル分布である。ここでいう中心波長は、例えば、ピーク強度の1/e2以上の光強度を有する波長幅の中心である。スペクトル波形#3は対称形であるがピーク波長が2つに分離したスペクトル分布である。
このようにスペクトル線幅E95が同一であっても、露光装置100におけるフォーカス位置の分布形状が異なり、露光性能が異なる場合がある。
図12は、結像性能の評価に用いられた長方形の結像パターンを示す。ガウス分布状のスペクトル波形#1を用いた場合に、ウエハ面に横寸法38nm、縦寸法76nmの長方形の結像パターンが投影光学系102によって形成されるように設計されたマスクを用いた。投影光学系102の縦色収差を250nm/pmとした。スペクトル波形#4~#9を用いた場合に、ウエハ面における結像パターンの横寸法が38nmとなるように露光量が調整された場合の、縦寸法の76nmからのずれΔCDをシミュレーションによって求めた。
図13に示されるように、中心波長とピーク波長との差が大きくなり、非対称性が大きくなるほど、ウエハ面における寸法誤差が大きくなり得る。また図14に示されるように、対称形のスペクトル分布であっても、ガウス分布との違いが大きくなるほど、ウエハ面における寸法誤差が大きくなり得る。
2.1 構成
図15は、本開示の実施形態に係るレーザ装置1aの構成を模式的に示す。レーザ装置1aにおいて、スペクトル計測制御プロセッサ60に含まれるメモリ61は、スペクトル評価値算出プログラム611を記憶している。
(1)1
(2)重心波長λc
(3)推定スペクトル波形I(λ)のスペクトル線幅E95
(4)推定スペクトル波形I(λ)と同じスペクトル線幅E95を有するガウス分布形状のスペクトル波形の標準偏差
図16は、実施形態におけるスペクトル評価値Vの計測の手順を示すフローチャートである。図16のS331~S336の処理は、図4において対応する処理と同様である。S336の後、スペクトル計測制御プロセッサ60はS338に処理を進める。
S338において、スペクトル計測制御プロセッサ60は、推定スペクトル波形I(λ)の重心波長λcを式2により算出する。
S339において、スペクトル計測制御プロセッサ60は、推定スペクトル波形I(λ)のスペクトル評価値Vを式3により算出する。
S339の後、スペクトル計測制御プロセッサ60は、本フローチャートの処理を終了する。
次に、スペクトル評価値V及びこれを用いた評価方法の有用性について、スペクトル線幅E95と比較しながら説明する。以下に説明するように、スペクトル評価値Vは様々な結像パターンの形状に適用できる。
図19においては、スペクトル評価値VとΔCDとの関係がほぼ1本の直線状となっている。このため、スペクトル評価値Vを測定することで、ウエハ面における結像性能を知ることができる。スペクトル評価値Vを一定の目標評価値に制御することで、求められる結像性能を達成し得る。
図22においては、スペクトル評価値VとΔCDとの関係がほぼ1本の直線状となっている。このため、スペクトル評価値Vを測定することで、ウエハ面における結像性能を知ることができる。スペクトル評価値Vを一定の目標評価値に制御することで、求められる結像性能を達成し得る。
式3においては、重心波長λcからの波長偏差λ-λcの2乗(λ-λc)2が用いられているが、本開示はこれに限定されない。スペクトル評価値Vは以下の式4により算出されてもよい。
図25は、実施形態におけるスペクトル制御の手順を示すフローチャートである。スペクトル計測制御プロセッサ60は、以下のようにしてスペクトル評価値Vと目標評価値Vtとを用いてスペクトル波形調整器15aを制御する。
発振トリガ信号が出力されていない場合(S32:NO)、スペクトル計測制御プロセッサ60は発振トリガ信号が出力されるまで待機する。
発振トリガ信号が出力された場合(S32:YES)、レーザ発振器20からレーザ光が出力される。スペクトル計測制御プロセッサ60は、S33に処理を進める。
S35において、スペクトル計測制御プロセッサ60は、制御信号を送信してスペクトルドライバ64を駆動することによりスペクトル波形調整器15aを制御する。例えば、スペクトル評価値Vが目標評価値Vtよりも大きい場合にはスペクトル線幅を小さくするようにスペクトル波形調整器15aを制御し、スペクトル評価値Vが目標評価値Vtよりも小さい場合にはスペクトル線幅を大きくするようにスペクトル波形調整器15aを制御する。
S35の後、スペクトル計測制御プロセッサ60は、S32に処理を戻す。
2.6.1 構成
図26及び図27は、スペクトル波形調整器の変形例の構成を概略的に示す。この変形例においては狭帯域化装置141がスペクトル波形調整器を構成する。図26は、-V方向に見た狭帯域化装置141を示し、図27は、-H方向に見た狭帯域化装置141を示す。
グレーティング14i及び14jは、V軸の方向において互いに異なる位置に配置されている。グレーティング14i及び14jの各々の溝の方向は、V軸の方向に一致している。
平行平面基板14oは、光ビームの第1の部分B1に面した端面14tをさらに含む。端面14tは、出射表面14sと鋭角をなす。端面14tは、HZ面と平行でもよい。
プリズム14bを通過した光ビームのうちの第1の部分B1は、平行平面基板14oの外側を通過してグレーティング14iに入射する。光ビームの第2の部分B2は、平行平面基板14oの内部を透過してグレーティング14jに入射する。このとき、平行平面基板14oは、光ビームの第2の部分B2の光路軸を第1の部分B1の光路軸に対して+V方向にシフトさせる。光路軸とは光路の中心軸をいう。このように、平行平面基板14oは、光ビームの一部を透過させることにより、光ビームの第1の部分B1から第2の部分B2を分離させる。
回転機構14mがグレーティング14jを僅かに回転させると、プリズム14bからグレーティング14iに入射する光ビームの入射角は変化しないが、プリズム14bからグレーティング14jに入射する光ビームの入射角が僅かに変化する。よって、第1の波長と第2の波長との波長差が変化する。
平行平面基板14oを-V方向に移動させることにより、光ビームのうちの平行平面基板14oに入射する第2の部分B2を多くすると、グレーティング14jに入射する光が多くなる。従って、レーザ光に含まれる第2の波長成分のエネルギーが大きくなる。
平行平面基板14oを+V方向に移動させることにより、光ビームのうちの平行平面基板14oに入射する第2の部分B2を少なくすると、グレーティング14jに入射する光が少なくなる。従って、レーザ光に含まれる第2の波長成分のエネルギーが小さくなる。
図26及び図27を参照しながら説明した構成の代わりに、以下の(1)又は(2)の構成が採用されてもよい。
(1)本開示の実施形態によれば、露光装置100に接続可能なレーザ装置1aは、レーザ装置1aから出力されるレーザ光の干渉パターンから平均波形Oaを取得する分光器19と、スペクトル計測制御プロセッサ60と、を備える。スペクトル計測制御プロセッサ60は、平均波形Oaを用いて波長λと光強度との関係を示す推定スペクトル波形I(λ)を算出し、推定スペクトル波形I(λ)の波長域に含まれる代表波長を算出し、代表波長からの波長偏差λ-λcの関数と推定スペクトル波形I(λ)で示される光強度との積を波長域に関して積分して得られた第1の積分値を用いてスペクトル評価値Vを算出するように構成されている。
これによれば、ガウス分布状のスペクトル波形と異なるスペクトル波形を有するレーザ光であっても露光装置100における露光性能を適切に評価することができる。また、スペクトル評価値Vは様々な結像パターンの形状に適用できる。このため、求められる露光性能を実現するためのスペクトル制御を適切に行うことができる。
これによれば、分光器19の装置関数S(λ)の影響を取り除いて、露光装置100における露光性能を適切に評価することができる。
これによれば、中心波長と重心波長λcとが異なる非対称なスペクトル波形であっても、露光装置100における露光性能を適切に評価することができる。
これによれば、中心波長と重心波長λcとが異なる非対称なスペクトル波形や、複数のピークを有するスペクトル波形であっても、露光装置100における露光性能を適切に評価することができる。
これによれば、スペクトル評価値Vを用いて露光装置100における露光性能を適切に評価し得る。
これによれば、スペクトル評価値Vを用いて露光装置100における露光性能をより適切に評価し得る。
これによれば、第3の積分値で除算することで、光量に関わらずスペクトル波形に応じた露光性能の評価を行うことができる。
これによれば、スペクトル評価値Vに含まれる波長λの次元を下げて、露光性能を適切に評価し得る。
これによれば、スペクトル評価値Vと目標評価値Vtとを用いた制御により、求められる露光性能を実現することができる。
これによれば、スペクトル線幅を小さくすることによりスペクトル評価値Vを小さくすることができ、スペクトル線幅を大きくすることによりスペクトル評価値Vを大きくすることができる。
上述の説明は、制限ではなく単なる例示を意図している。従って、特許請求の範囲を逸脱することなく本開示の実施形態に変更を加えることができることは、当業者には明らかである。また、本開示の実施形態を組み合わせて使用することも当業者には明らかである。
Claims (20)
- 露光装置に接続可能なレーザ装置であって、
前記レーザ装置から出力されるレーザ光の干渉パターンから計測波形を生成する分光器と、
プロセッサであって、
前記計測波形を用いて波長と光強度との関係を示す第1のスペクトル波形を算出し、
前記第1のスペクトル波形の波長域に含まれる代表波長を算出し、
前記代表波長からの波長偏差の関数と前記光強度との積を前記波長域に関して積分して得られた第1の積分値を用いて前記第1のスペクトル波形の評価値を算出するように構成された前記プロセッサと、
を備えるレーザ装置。 - 請求項1記載のレーザ装置であって、
前記プロセッサは、
前記計測波形をスペクトル空間にマッピングして第2のスペクトル波形を生成し、
前記第2のスペクトル波形を前記分光器の装置関数で逆畳み込み積分することにより前記第1のスペクトル波形を算出する、
レーザ装置。 - 請求項1記載のレーザ装置であって、
前記代表波長は前記第1のスペクトル波形の重心波長である、
レーザ装置。 - 請求項3記載のレーザ装置であって、
前記プロセッサは、前記波長と前記光強度との積を前記波長域に関して積分して得られた第2の積分値を、前記光強度を前記波長域に関して積分して得られた第3の積分値で除算することにより、前記重心波長を算出する、
レーザ装置。 - 請求項1記載のレーザ装置であって、
前記関数は、べき指数を正数とする前記波長偏差の絶対値のべき乗である、
レーザ装置。 - 請求項5記載のレーザ装置であって、
前記べき指数は、1.9以上、2.1以下である、
レーザ装置。 - 請求項1記載のレーザ装置であって、
前記プロセッサは、前記第1の積分値を、前記光強度を前記波長域に関して積分して得られた第3の積分値で除算することにより、前記評価値を算出する、
レーザ装置。 - 請求項1記載のレーザ装置であって、
前記プロセッサは、前記第1の積分値を、前記光強度を前記波長域に関して積分して得られた第3の積分値と前記波長域に含まれる前記波長の関数との積で除算することにより、前記評価値を算出する、
レーザ装置。 - 請求項1記載のレーザ装置であって、
前記分光器に入射する前記レーザ光のスペクトル波形を調整するスペクトル波形調整器をさらに備え、
前記プロセッサは、前記評価値と目標評価値との比較結果を用いて前記スペクトル波形調整器を制御する、
レーザ装置。 - 請求項9記載のレーザ装置であって、
前記スペクトル波形調整器は、前記レーザ光のスペクトル線幅を調整するように構成され、
前記プロセッサは、前記評価値が前記目標評価値より大きい場合に前記スペクトル線幅を小さくするように前記スペクトル波形調整器を制御し、前記評価値が前記目標評価値より小さい場合に前記スペクトル線幅を大きくするように前記スペクトル波形調整器を制御する、
レーザ装置。 - 露光装置に接続可能なレーザ装置から出力されるレーザ光の干渉パターンから計測波形を生成し、
前記計測波形を用いて波長と光強度との関係を示す第1のスペクトル波形を算出し、
前記第1のスペクトル波形の波長域に含まれる代表波長を算出し、
前記代表波長からの波長偏差の関数と前記光強度との積を前記波長域に関して積分して得られた第1の積分値を用いて前記第1のスペクトル波形の評価値を算出する
ことを含む、レーザ光のスペクトルの評価方法。 - 請求項11記載の評価方法であって、
前記計測波形をスペクトル空間にマッピングして第2のスペクトル波形を生成し、
前記第2のスペクトル波形を前記計測波形を生成した分光器の装置関数で逆畳み込み積分することにより前記第1のスペクトル波形を算出する、
評価方法。 - 請求項11記載の評価方法であって、
前記代表波長は前記第1のスペクトル波形の重心波長である、
評価方法。 - 請求項13記載の評価方法であって、
前記波長と前記光強度との積を前記波長域に関して積分して得られた第2の積分値を、前記光強度を前記波長域に関して積分して得られた第3の積分値で除算することにより、前記重心波長を算出する、
評価方法。 - 請求項11記載の評価方法であって、
前記関数は、べき指数を正数とする前記波長偏差の絶対値のべき乗である、
評価方法。 - 請求項15記載の評価方法であって、
前記べき指数は、1.9以上、2.1以下である、
評価方法。 - 請求項11記載の評価方法であって、
前記第1の積分値を、前記光強度を前記波長域に関して積分して得られた第3の積分値で除算することにより、前記評価値を算出する、
評価方法。 - 請求項11記載の評価方法であって、
前記第1の積分値を、前記光強度を前記波長域に関して積分して得られた第3の積分値と前記波長域に含まれる前記波長の関数との積で除算することにより、前記評価値を算出する、
評価方法。 - 請求項11記載の評価方法であって、
前記評価値と目標評価値との比較結果を用いて前記レーザ光のスペクトル波形を調整する、
評価方法。 - 電子デバイスの製造方法であって、
露光装置に接続可能なレーザ装置から出力されるレーザ光の干渉パターンから計測波形を生成する分光器と、
プロセッサであって、
前記計測波形を用いて波長と光強度との関係を示す第1のスペクトル波形を算出し、
前記第1のスペクトル波形の波長域に含まれる代表波長を算出し、
前記代表波長からの波長偏差の関数と前記光強度との積を前記波長域に関して積分して得られた第1の積分値を用いて前記第1のスペクトル波形の評価値を算出するように構成された前記プロセッサと、
を備える前記レーザ装置によって前記レーザ光を生成し、
前記レーザ光を前記露光装置に出力し、
前記電子デバイスを製造するために、前記露光装置内で感光基板上に前記レーザ光を露光する
ことを含む電子デバイスの製造方法。
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