WO2012048534A1 - 化合物半导体晶片清洗方法 - Google Patents
化合物半导体晶片清洗方法 Download PDFInfo
- Publication number
- WO2012048534A1 WO2012048534A1 PCT/CN2011/001721 CN2011001721W WO2012048534A1 WO 2012048534 A1 WO2012048534 A1 WO 2012048534A1 CN 2011001721 W CN2011001721 W CN 2011001721W WO 2012048534 A1 WO2012048534 A1 WO 2012048534A1
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- WIPO (PCT)
- Prior art keywords
- wafer
- minutes
- hydrogen peroxide
- water
- deionized water
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02041—Cleaning
- H01L21/02043—Cleaning before device manufacture, i.e. Begin-Of-Line process
- H01L21/02052—Wet cleaning only
Definitions
- the present invention relates to a method of cleaning a compound semiconductor wafer, particularly a III-V compound such as a gallium arsenide (GaAs)-semiconductor wafer.
- a III-V compound such as a gallium arsenide (GaAs)-semiconductor wafer.
- GaAs III-V compounds Semiconductor materials represented by gallium arsenide (GaAs) III-V compounds (ie, compounds consisting of Group III and Group ⁇ V elements) due to their unique electrical properties, in satellite communications, microwave devices, laser devices, and luminescence There are a wide range of applications in the field of diodes and the like.
- Devices such as heterojunction bipolar transistors (HBTs), high electron mobility transistors (HEMTs), and LEDs need to be fabricated on high quality substrate surfaces by molecular beam epitaxy (MBE) or organometallic compound vapor phase epitaxy (MOCVD). Quantum well structure. As the fabrication process of semiconductor devices continues to improve, the device size becomes smaller and smaller, and the utilization efficiency becomes higher and higher. The quality of the semiconductor substrate, especially the quality of the wafer surface, has an increasingly greater influence on the reliability and stability of the device. .
- the cleaning step is the last in the wafer processing process and is the key to achieving a high quality surface.
- the goal is to remove the various residual materials from the previous process and obtain a fresh, clean surface that will provide the basis for subsequent production.
- the mature semiconductor silicon wafer cleaning technology which is developed by RCA (Radio Corporation of America) in 1970, ammonia, hydrogen peroxide and water (APM or SC-1) is still basically used.
- Gallium arsenide is a binary compound semiconductor, and its physical and chemical properties are quite different from those of a single crystalline silicon single crystal.
- the surface of gallium arsenide is composed of Ga and As atoms. Due to the different chemical properties of arsenic and gallium, the surface reaction characteristics are different.
- the natural oxide layer contains gallium dioxide (Ga 2 0 3 ) and arsenic trioxide (As 2 0 3 ). , arsenic pentoxide (As 2 O s ) and a small amount of elemental arsenic (As ).
- the commonly used SC-1 and SC-2 have a very obvious corrosive effect on gallium arsenide.
- the method of the present invention can improve the cleanliness, micro-roughness and uniformity of the wafer surface. detailed description
- the present invention provides a III-V compound semiconductor wafer cleaning method, which comprises the following steps:
- the method comprises the steps of:
- the wafer is treated with diluted ammonia, hydrogen peroxide and water at a temperature of C;
- the resistivity value of deionized water is 25.
- the value of C In the first step of the process of the invention (the wafer is treated with dilute aqueous ammonia, hydrogen peroxide and water at a temperature not higher than 20 ° C), the treatment is advantageously not higher than 20.
- the temperature of C is preferably carried out at a temperature not higher than 15 ° C, more preferably 5-15.
- the temperature of C is carried out.
- the treatment time is usually from 2 to 25 minutes, preferably from 3 to 20 minutes, more preferably from 5 to 18 minutes.
- the energy density of the megasonic wave is 0.001-0.003 W/mm 2 , preferably 0.0012-0.0022 W/mm 2 , based on the area of the wafer.
- the time of megasonic action can be the same as the time of processing the wafer with diluted ammonia, hydrogen peroxide and water systems, or longer or shorter than the time of processing the wafer with diluted ammonia, hydrogen peroxide and water systems, for example with diluted ammonia,
- the wafer is processed intermittently with megasonic waves during the time that the hydrogen peroxide and water systems process the wafer.
- the temperature of C is preferably not higher than 20.
- the temperature of C is more preferably 5-20.
- the temperature of C is treated with an oxidizing agent to form a uniform oxide layer on the surface of the wafer to improve the unevenness caused by the previous step.
- the oxidizing agent used in this step can be any conventional An oxidizing agent such as hydrogen peroxide, an organic peroxide (e.g., benzoyl peroxide) or ozone water.
- This step is preferably carried out by solution oxidation, for example using a 10% to 30% strength hydrogen peroxide solution.
- the treatment time is usually from 1 to 45 minutes, preferably from 3 to 30 minutes, more preferably from 5 to 15 minutes.
- This process can also be carried out in part or in full with megasonic technology.
- the megasonic wave has a wavelength in the range of 480-1000 kHz, preferably 600-850 kHz. Based on the single-sided area of the wafer, the energy density of the megasonic wave is
- the fifth step of the process of the invention treatment of the wafer with a dilute acid or dilute alkali solution
- it is usually at a temperature not higher than 30 ° C, preferably not higher than 20.
- the temperature of C more preferably at a temperature of 5-20 ° C, based on the characteristics that the gallium arsenide surface oxide can be dissolved in an acid or alkali solution, the dilute acid or a dilute alkali solution is used to dissolve the previously formed oxide layer to reveal a fresh GaAs surface.
- the dilute acid or dilute alkali solution may be, for example, a dilute solution of hydrochloric acid, hydrofluoric acid or nitric acid at a concentration of 0.1 to 12%, preferably 0.5 to 8%, or an aqueous solution having a concentration of 0.5 to 20%, preferably 1-15%. , a dilute solution of sodium hydroxide or potassium hydroxide.
- the treatment time is usually from 1 to 45 minutes, preferably from 3 to 30 minutes, more preferably from 5 to 15 minutes.
- This process can also be carried out in part or in full with megasonic technology.
- the megasonic wave has a wavelength in the range of 480 to 1000 kHz, preferably 600 to 850 kHz.
- the energy density of the megasonic wave is 0.001-0.003 W/mm 2 , preferably 0.0012-0.0022 W/mm 2 , based on the area of the wafer.
- steps 2, 4 and 6 of rinsing the wafer with deionized water are preferably carried out at a lower temperature, for example at a temperature not higher than 30 ° C, preferably at a temperature not higher than 25 ° C, more preferably It is carried out at a temperature of 8-20 °C.
- the rinsing time is from 1 to 15 minutes, preferably from 3 to 10 minutes.
- the deionized water used may, for example, have a resistivity of not less than 15 megohm cm.
- the megasonic wave has a wavelength in the range of 480-1000 kHz, preferably 600-850 kHz.
- the energy density of the megasonic action is from 0.001 to 0.003 W/mm 2 , preferably from 0.0012 to 0.0022 W/mm 2 , based on the area of one side of the wafer.
- features of the method of the present invention include: removal of major residues and foreign particles by low temperature and optional megasonic waves due to the use of a dilute aqueous ammonia: hydrogen peroxide: water system, thereby reducing excessive corrosion of the wafer surface; Through the reoxidation process after corrosion, the surface is more uniform.
- Wet cleaning station (including corrosion tank and quick drain)
- Wafer Rotary Dryer (Semitool Model SRD, USA) Wafer quality inspection method: Yamada glare (light is stronger than 100,000 Lux), wafer surface analyzer (KLA-TENCOR, USA 6220), atomic force microscope (AFM) American Digital Instrumen company NanoScope Ilia type) (vertical resolution 0.03 legs, analysis area 5 ⁇ 5 ⁇ ).
- Wafer to be cleaned 150.04mm (6 inch) GaAs wafer that has been rough and fine polished to a thickness of 650 ⁇ m.
- the surface of the wafer was inspected with a strong light, with visible particles and white mist.
- the surface microscopic roughness Ra 0.18 nm was examined by atomic force microscopy.
- One wafer was immersed in an aqueous solution containing megasonic waves (frequency 780 KHz, energy density 0.00125 W/mm 2 ) containing 0.3% NH 3 aqueous ammonia and 1.3% H 2 O 2 hydrogen peroxide at 10. Under C, it is processed for 5 minutes and the whole process uses megasonic waves.
- megasonic waves frequency 780 KHz, energy density 0.00125 W/mm 2
- the wafer is then placed in a rinse tank at 15. Under C, the surface of the wafer was rinsed with a resistivity of 17.5 M ⁇ cm of deionized water and rinsed with a fast-discharge spray for 3 minutes, using megasonic waves throughout.
- the wafer is then placed in a rinse tank at 15. Under C, the wafer surface was rinsed with a deionized water overflow rinse with a resistivity of 17.5 M ⁇ -cm for 3 minutes in combination with a fast-discharge spray, using megasonic waves throughout.
- the rinsed wafer was placed in a wafer rotary dryer and dried with hot nitrogen.
- the dried wafer was inspected with a glare lamp, a TENCOR 6220, and an atomic force microscope lamp.
- the wafer was immersed in an aqueous solution containing 0.5% NH 3 and 0.3% H 2 0 2 in the, at 20 ° C, for 10 minutes.
- the rinsed wafer is immersed in 20. C was treated in a saturated aqueous solution of benzoyl peroxide for 10 minutes.
- the rinsed wafer was immersed in a 5% HCl aqueous solution at 20. Under C, handle for 10 minutes.
- the rinsed wafer was placed in a wafer rotary dryer and dried with hot nitrogen.
- the wafer was placed in a rinse tank, and the surface of the wafer was rinsed with a deionized water overflow rinse having a resistivity of 17.5 M ⁇ .cm at 10 ° C for 3 minutes in combination with a fast discharge spray, using megasonic waves throughout.
- the rinsed wafer was immersed in a megasonic (frequency 700 KHz, energy density 0.0014 W/mm 2 ) 12% hydrogen peroxide solution at 20. Under C, handle for 5 minutes and use megasonic waves throughout.
- the wafer was then placed in a rinse tank, and the surface of the wafer was rinsed with a deionized water overflow rinse with a resistivity of 17.5 megohm-cm at 20 ° C for 5 minutes in combination with a fast-discharge spray. .
- the rinsed wafer was immersed in a megasonic (frequency 700 KHz, energy density 0.0014 W/mm 2 ) 10% aqueous ammonia solution at 10. Under C, handle for 10 minutes.
- the wafer was then placed in a rinse tank, and the surface of the wafer was rinsed with a deionized water overflow rinse with a resistivity of 17.5 megohm-cm at 20 ° C for 3 minutes in combination with a fast-discharge spray. .
- the rinsed wafer was placed in a wafer rotary dryer and dried with hot nitrogen.
- the dried wafer was inspected with a glare lamp, a TENCOR 6220, and an atomic force microscope lamp.
- the wafer is then placed in a rinse tank at 15. Under C, the wafer surface was rinsed with a deionized water overflow rinse with a resistivity of 17.5 M ⁇ -cm for 3 minutes in combination with a fast-discharge spray, using megasonic waves throughout.
- the rinsed wafer was immersed in a megasonic (frequency 680 KHz, energy density 0.0015 W/mm 2 ) 12% aqueous ammonia solution at 20. Under C, handle for 5 minutes.
- the wafer is then placed in a rinse tank at 15. Under C, the wafer surface was rinsed with a deionized water overflow rinse with a resistivity of 17.5 M ⁇ -cm for 5 minutes in combination with a fast-discharge spray, using megasonic waves throughout.
- the rinsed wafer was placed in a wafer rotary dryer and dried with hot nitrogen.
- the dried wafer was inspected with a glare lamp, a TENCOR 6220, and an atomic force microscope lamp.
- the surface of the wafer was inspected with a strong light to confirm that there were no visible particles and no white fog.
- the rinsed wafer was immersed in megasonic (frequency 800 KHz, energy density 0.0014 W/mm 2 ) 0 3 ozone water at 15 ppm. Under C, it is processed for 5 minutes and the whole process uses megasonic waves.
- megasonic frequency 800 KHz, energy density 0.0014 W/mm 2
- the wafer was then placed in a rinse tank, and the wafer surface was rinsed with a deionized water overflow rinse with a resistivity of 17.5 megohm-cm at 15 ° C for 3 minutes in combination with a fast-discharge spray. .
- the rinsed wafer was placed in a wafer rotary dryer and dried with hot nitrogen.
- the dried wafer was inspected with a glare lamp, a TENCOR 6220, and an atomic force microscope lamp.
- the surface of the wafer was inspected with a strong light to confirm that there were no visible particles and no white fog.
- the number of particles larger than 0.3 ⁇ m was 45 and the Haze value was 0.27 ppm.
- the surface microscopic roughness Ra 0.14 nm was examined by atomic force microscopy.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Cleaning Or Drying Semiconductors (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013533070A JP6088431B2 (ja) | 2010-10-15 | 2011-10-14 | 化合物半導体ウエハーのクリーニング方法 |
US13/879,173 US8691019B2 (en) | 2010-10-15 | 2011-10-14 | Process for cleaning a compound semiconductor wafer |
EP11831931.8A EP2629319B1 (en) | 2010-10-15 | 2011-10-14 | Process for cleaning compound semiconductor wafer |
Applications Claiming Priority (2)
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CN2010105138607A CN102064090B (zh) | 2010-10-15 | 2010-10-15 | 化合物半导体晶片清洗方法 |
CN201010513860.7 | 2010-10-15 |
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WO2012048534A1 true WO2012048534A1 (zh) | 2012-04-19 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/CN2011/001721 WO2012048534A1 (zh) | 2010-10-15 | 2011-10-14 | 化合物半导体晶片清洗方法 |
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Country | Link |
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US (1) | US8691019B2 (zh) |
EP (1) | EP2629319B1 (zh) |
JP (1) | JP6088431B2 (zh) |
CN (1) | CN102064090B (zh) |
WO (1) | WO2012048534A1 (zh) |
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Also Published As
Publication number | Publication date |
---|---|
JP2013541212A (ja) | 2013-11-07 |
EP2629319A4 (en) | 2015-01-14 |
CN102064090B (zh) | 2013-01-09 |
US20130276824A1 (en) | 2013-10-24 |
JP6088431B2 (ja) | 2017-03-01 |
US8691019B2 (en) | 2014-04-08 |
EP2629319A1 (en) | 2013-08-21 |
EP2629319B1 (en) | 2017-08-16 |
CN102064090A (zh) | 2011-05-18 |
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