CN117353660B - Multi-junction battery spectral responsivity test method and device - Google Patents
Multi-junction battery spectral responsivity test method and device Download PDFInfo
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Abstract
The invention relates to a method and a device for testing spectral responsivity of a multi-junction battery, belonging to the field of solar battery testing, wherein the method comprises the following steps: irradiating the light source to the incident slit through collimation and focusing; reflecting the light to the grating through the collimating mirror for dispersion; focusing through a focusing mirror, and reflecting and conveying to a digital micro-mirror array; and loading, switching and sending picture data coded by different wavelengths through a control unit, controlling a digital micromirror array to simultaneously output direct-current bias light and alternating-current excitation light at a preset frequency, synchronously irradiating the direct-current bias light and the alternating-current excitation light on the tested multi-junction laminated battery, and finally outputting a response photocurrent signal of the tested sub-junction to obtain a spectral responsivity curve of the tested sub-junction. The invention outputs the DC adjustable bias light and AC adjustable monochromatic light simultaneously, realizes that the space is coincided and irradiated on the surface of the tested device, and realizes the flexible, efficient and high-precision multi-junction battery spectral responsivity test.
Description
Technical Field
The invention belongs to the technical field of solar cell testing, and particularly relates to a multi-junction cell spectral responsivity testing method and device.
Background
At present, the solar cell is approaching to the SQ theoretical limit efficiency of the single junction cell more and more, and the photoelectric response spectrum range of any solar cell designed by adopting a single semiconductor material is too narrow relative to the solar spectrum, and only a certain range of light energy in the solar spectrum can be effectively converted into electric energy, so that the photoelectric conversion efficiency of the solar cell is restricted. The multi-junction laminated batteries with double junctions, triple junctions and the like can stack semiconductor materials with different forbidden bandwidths, respectively absorb incident light with different wavelength ranges, the energy band of the top-layer battery is highest, and the energy bands of the top-layer battery are reduced downwards in sequence, so that photons with high energy are absorbed by the battery with large energy band at the upper layer, photons with low energy are absorbed by the battery at the lower layer, and the photoelectric conversion efficiency is improved.
The rapid development of multi-junction tandem solar cells has raised the requirements for cell conversion efficiency testing. The monolithic multi-junction cell is often stacked on a substrate by adopting a semiconductor epitaxial growth technology, different junctions are connected in series through tunnel junctions, and the whole multi-junction cell is only provided with two terminals, so that the junction junctions are not easy to separate, the optical characteristics and the electrical characteristics of PN junctions in the whole testing process are mutually influenced, and a spectrum response testing system different from a single junction solar cell needs to be developed.
The patent number 201510312471.0 discloses a chopping monochromator and a quantum effect detector, which have the function of monochromator, can also chop through the opening and closing of a digital micromirror, and have the chopping modulation function. However, the invention is directed to single junction cell testing and does not contemplate that multi-junction cell testing requires a beam of bias light that switches spectral range and intensity multiple times. Because the light with different wavelengths has different output directions after passing through the grating element and the digital micromirror device, the problem of spatial consistency of the output of different wavelengths and spectral ranges cannot be directly ensured, and the variation of the output directions of monochromatic light with different wavelengths and broad spectrum light can be caused, so that the error of the spectral responsivity test of the photoelectric device is caused.
The invention patent with the application number 201810651960.2 discloses a rapid testing system and a rapid testing method for the external quantum efficiency of a solar cell based on frequency division multiplexing. However, since a large number of micromirrors are used for frequency division multiplexing, the method cannot output high-intensity bias light and excitation light at the same time, and cannot realize high-efficiency high-precision low-cost test of the multi-junction battery, aiming at the energy and spectral range of bias light which outputs custom spectral range and intensity.
In the prior art, the spectral responsivity test of the multi-junction battery needs an adjustable monochromatic light source as excitation light, a grating monochromator, an acousto-optic adjustable filter and the like as a light splitting unit, alternating illumination is generated through a chopper at the same time to generate alternating electric signals, but each single junction solar cell of the multi-junction solar cells connected in series has different spectral response distribution, when monochromatic light with a certain wavelength is irradiated on the surface of the multi-junction battery, only one cell can be activated and spectral response is generated, other cells are not activated, the whole short-circuit current output is zero, and the spectral response measurement cannot be realized. Testing of multi-junction cells also requires reasonable optical biasing techniques. When testing different photocell units, the irradiance distribution of the bias light also needs to be changed to meet the specified illuminance requirement. Taking a solar cell of a three-junction photocell unit as an example, the prior art needs to introduce three groups of direct current bias light, and the response spectrum range is selected through an optical filter, so that the bias irradiation requirement of each junction photocell unit is met.
In addition, when spectral responsivity is tested, the tested sub-battery needs to be kept in a short circuit state, and the working voltage of the tested sub-battery is shifted due to the action of bias light. Taking the bottom cell test of a single-chip three-junction cell as an example, the whole cell is kept at a low current level of the bottom cell due to the limiting effect of series current, the output voltages of other two cells are not zero, and the output voltage of the bottom cell is neither zero nor in a short circuit state. In order to put the bottom cell and the entire cell in a short circuit state, it is also necessary to apply a bias voltage to maximize the output current of the bottom cell while the entire cell output voltage is zero.
In the bias light technology based on the optical filters in the prior art, a plurality of optical filters are required to be arranged in a system, and by taking the test of a three-junction battery as an example, exciting light uses a xenon lamp light source split by a grating spectrometer as an adjustable monochromatic light source, and an alternating current mode is realized by using a chopper and a phase-locked amplifier. In the aspect of bias light, corresponding spectrum matching is realized by selecting different optical filters after beam splitting. A first junction test, selecting a long-pass filter; the second junction test, choose to use the short-pass and long-pass filter; a short-pass filter is selected for the third test. The spectral response interval often needs to be updated continuously in the device development process, which also means that the filter needs to be reselected. The existing bias light technology based on multi-junction battery test is also a method based on an optical filter, the spectral response range of a device cannot be matched very conveniently, and time and labor are wasted and the accuracy is not enough. The above solution makes the test system too complex and bulky and the maintenance costs are also high.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a multi-junction battery spectral responsivity testing method and device, and simultaneously output direct-current adjustable bias light and alternating-current adjustable monochromatic light, so as to realize space overlapping irradiation on the surface of a tested device and realize flexible, efficient and high-precision multi-junction battery spectral responsivity testing.
In one aspect, the invention discloses a multi-junction battery spectral responsivity test method, which comprises the following steps:
s2, using a steady-state broad-spectrum light source with high energy density as a light source, and irradiating the light source to an incident crack through collimation and focusing;
s3, reflecting the light from the incident slit to the grating through the collimating mirror, and dispersing through the grating;
s4, focusing the light from the grating through a focusing mirror, and reflecting and conveying the light to a digital micro-mirror array;
Step S5, loading, switching and sending picture data coded by different wavelengths through a control unit, and controlling the digital micro-mirror array to simultaneously output direct-current bias light and alternating-current excitation light at a preset frequency, so that the digital micro-mirror array projects light beams with specific spectral distribution and light source modulation frequency;
s6, projecting the alternating current excitation light and the direct current bias light into a light path collimation light equalizer and then synchronously irradiating the alternating current excitation light and the direct current bias light on a tested multi-junction laminated cell;
Step S7, loading preset bias voltage on the tested multi-junction laminated battery, transmitting signals obtained through the positive electrode and the negative electrode of the battery to a pre-amplifier, outputting the signals to a phase-locked amplifier, obtaining average signals of a plurality of periods through integration time by the phase-locked amplifier, and finally outputting response photocurrent signals of the tested sub-junction under a certain monochromatic excitation light;
And S8, switching the wavelength and the light intensity of the adjustable monochromatic light by sequentially switching the picture data encoded by different wavelengths, and obtaining a spectral responsivity curve of the measured sub-junction under the adjustable monochromatic light.
Further, before step S2, the method further includes:
Step S1, testing spectral response characteristics of a single-piece single-junction battery of each sub-junction, and respectively determining the spectral range of direct current bias light and the response light intensity of each tested sub-junction of the multi-junction laminated battery to be tested and the spectral range of alternating current excitation light and the response light intensity according to test results.
Further, the method further comprises: and adjusting the entrance slit according to the parameters of the grating, and changing the size of the light spot irradiated on the digital micromirror array by adjusting the slit width of the entrance slit.
Further, the picture data comprises a digital code corresponding to direct current bias light, or a digital code corresponding to alternating current excitation light, or both the digital code corresponding to direct current bias light and the digital code corresponding to alternating current excitation light;
and in the step S5, alternating current excitation light and direct current bias light are obtained through loading and switching the picture data.
In another aspect, the invention discloses a multi-junction cell spectral responsivity test device, comprising: a light source unit and a grating micro-mirror array dimming module; wherein,
The light source unit is used for providing a basic light source for the grating micro-mirror array dimming module;
The grating micro-mirror array dimming module is used for simultaneously outputting direct current bias light with a spectrum range and adjustable monochromatic alternating current excitation light, and comprises:
an entrance slit for adjusting to generate different slit widths, the spectral resolution of light from the light source unit being adjusted based on the different slit widths;
A collimator mirror for reflecting light from the entrance slit to the grating;
A grating for dispersing light passing through the entrance slit;
The focusing mirror is used for focusing the light rays from the grating and reflecting and conveying the light rays to the digital micro-mirror array;
The control unit is used for loading, switching and sending picture data coded by different wavelengths, and controlling the digital micromirror array to simultaneously output direct current bias light and alternating current excitation light at a preset frequency; the picture data comprises a digital code corresponding to direct current bias light or a digital code corresponding to alternating current excitation light or both the digital code corresponding to the direct current bias light and the digital code corresponding to the alternating current excitation light;
the digital micro mirror array is used for carrying out digital optical processing on the light rays from the focusing mirror, outputting light beams with specific spectral distribution and light source modulation frequency, and outputting direct current bias light and alternating current excitation light as test light sources for measuring the multi-junction laminated battery.
Further, the light source unit is a steady-state broad spectrum light source with high energy density.
Further, the incident slit is a rectangular adjustable slit, and the width of the slit is adjustable within the range of 20um-3mm.
Further, the method further comprises the following steps: a multi-junction stacked cell; the multi-junction stacked cell comprises a single junction cell or a multi-junction stacked cell.
Further, the method further comprises the following steps:
And the signal detection unit is electrically connected with the multi-junction laminated battery unit and is used for detecting the electric signals of the multi-junction laminated battery unit.
Further, the signal detection unit comprises a bias voltage source, a preamplifier, a lock-in amplifier and a data acquisition module which are electrically connected in sequence; wherein,
The bias voltage source is electrically connected with the multi-junction laminated battery cell and is used for providing bias voltage;
The preamplifier is used for carrying out current-voltage gain with a certain coefficient on the obtained photocurrent signal and converting the current-voltage gain into a voltage signal;
a phase-locked amplifier for separating the alternating current signal from the signal output from the pre-amplifier,
And the signal acquisition module is used for acquiring the test signal to obtain the spectrum response signal of the tested sub-junction of the multi-junction laminated battery unit.
The invention has the following beneficial effects:
The method and the device can output bias light beams with certain spectral range and intensity and adjustable monochromatic light beams according to the requirements of the sub-junction to be detected of the single-chip multi-junction battery, realize the spatial consistency of output light with different wavelengths by utilizing a dodging light path, and then realize the accurate test of the spectral responsivity of the multi-junction battery by utilizing a bias light power supply and a test circuit. The spectrum can be changed according to different device structures and spectral response characteristics of devices, and the spectrum is used as a test light source of a multi-junction battery test system, so that the multi-junction battery test system has strong compatibility and innovation. According to the invention, the simultaneous output of monochromatic light and bias light with a certain spectral range is realized through a single step, and meanwhile, the accurate test of the spectral responsivity of the multi-junction battery is realized by utilizing a dodging light path, a bias light power supply and a test circuit. Compared with a traditional bias light system based on an optical filter, the multi-junction battery testing system has the advantages that the testing system is greatly simplified, and the maintenance cost is reduced.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views. It is apparent that the drawings in the following description are only some of the embodiments described in the embodiments of the present invention, and that other drawings may be obtained from these drawings by those of ordinary skill in the art.
FIG. 1 is a flow chart of a method for testing spectral responsivity of a multi-junction battery according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a multi-junction battery spectral responsivity test device according to an embodiment of the present invention;
Fig. 3 is a schematic diagram of a digital micromirror array loading image according to an embodiment of the present invention.
Reference numerals:
a light source unit; 21, an entrance slit; 22, a collimating mirror; a 23 grating; 24, focusing mirror; 25, a digital micromirror array; 26, an optical path collimation homogenizer; 27, a control unit; 31, a bias voltage source; 32, a pre-amplifier; 33, phase-locked amplification; 34, a data acquisition module; 4, a multi-junction laminated cell unit; 5, digital coding of direct current bias light; and 6, digital coding of alternating-current excitation light.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are obtained by a person skilled in the art based on the embodiments of the present application, fall within the scope of protection of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type, and are not limited to the number of objects, such as the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
The invention provides a multi-junction battery spectral responsivity test method and device, which adopts an automatic control dimming system based on grating dispersion and digital micromirror array light splitting as a multi-junction battery spectral responsivity test light source, can output direct-current adjustable bias light and alternating-current adjustable monochromatic light at the same time, can realize simultaneous output of a plurality of beams of light with adjustable output spectrum and adjustable modulation frequency aiming at the spectral response characteristics of different device structures and devices, and irradiates the surfaces of tested devices in a space superposition manner, and realizes flexible, efficient and high-precision multi-junction battery spectral responsivity test on the basis of bias voltage and a lock-in amplifier.
Method embodiment
The invention discloses a multi-junction battery spectral responsivity test method. Specifically, as shown in fig. 1, the method includes steps S1 to S8.
Step S1, testing spectral response characteristics of a single-piece single-junction battery of each sub-junction, and respectively determining the spectral range of direct current bias light and the response light intensity of each tested sub-junction of the multi-junction laminated battery to be tested and the spectral range of alternating current excitation light and the response light intensity according to test results.
And S2, utilizing a steady-state broad-spectrum light source with high energy density as a light source, and irradiating the light source to an incident crack through collimation and focusing.
Preferably, the light source unit 1 is a steady-state broad spectrum light source of high energy density, such as a high-power xenon lamp light source or a laser-driven white light source.
Illustratively, the entrance slit is a rectangular adjustable slit with a slit width adjustable in the range of 20um-3mm.
And S3, reflecting the light from the incident slit to the grating through the collimating mirror, and dispersing through the grating.
And S4, focusing the light from the grating through a focusing mirror, and reflecting and conveying the light to the digital micro-mirror array.
Preferably, the entrance slit is adjusted according to the parameters of the grating, and the size of the light spot irradiated on the digital micromirror array is changed by adjusting the slit width of the entrance slit.
And S5, loading, switching and sending picture data coded by different wavelengths through a control unit, and controlling the digital micro-mirror array to simultaneously output direct-current bias light and alternating-current excitation light at a preset frequency, so that the digital micro-mirror array projects light beams with specific spectral distribution and light source modulation frequency.
Specifically, different columns of the dmd correspond to different wavelengths and the number of rows correspond to the intensity of the wavelengths. The digital micromirror array outputs different spectral distributions and intensities by adjusting different column intervals and row intervals.
The control unit adjusts the number of columns of the single-color light occupied micro mirrors by controlling the digital micro mirror array to realize the resolution and the intensity adjustment of the output light.
Specifically, the control unit loads picture data of different resolutions at a certain frequency, and controls rows and columns of the digital micromirror array based on the picture data.
Illustratively, after the digital micromirror array front-end circuit receives the picture data, the rotation angle of each micromirror on the micromirror is controlled by the encoding order of the micromirror array.
The picture data comprises a digital code corresponding to direct current bias light or a digital code corresponding to alternating current excitation light or both a digital code corresponding to direct current bias light and a digital code corresponding to alternating current excitation light.
For example, when alternating current excitation light of 100Hz and steady dc bias light are required, pictures are required to be loaded at 100Hz, as shown in fig. 3, the left picture of fig. 3 shows the digital code 5 corresponding to the dc bias light for 90ms, and the right picture of fig. 3 shows the digital code 5 of the dc bias light and the digital code 6 of the alternating current excitation light simultaneously for 10ms, and the time interval between switching of the two pictures is negligible. And by analogy, the alternating current excitation light of 100Hz and the steady direct current bias light are obtained through loading and switching of the picture data.
Steady-state dc bias light, bias voltage effects: for the test of the spectral responsivity of the multi-junction laminated battery, the spectral responsivity of each junction needs to be tested independently, an adjustable monochromatic light source is often needed to be used as alternating current excitation light of a tested sub-junction, and when the spectral responsivity is tested, as different junctions of the multi-junction battery are combined in series through tunnel junctions, in order to keep the channel state of the battery, the tested sub-battery needs to keep a short circuit state, and direct current bias light with certain intensity needs to be applied to the non-tested sub-junction. And the working voltage of the sub-battery to be tested is shifted due to the effect of the direct current bias light. Taking the bottom cell test of a single-chip three-junction cell as an example, the whole cell is kept at a low current level of the bottom cell due to the limiting effect of series current, the output voltages of other two cells are not zero, and the output voltage of the bottom cell is neither zero nor in a short circuit state. In order to put the bottom cell and the entire cell in a short circuit state, it is also necessary to apply a bias voltage to maximize the output current of the bottom cell while the entire cell output voltage is zero. In order to separate the excitation signal from the bias light and bias voltage signals, it is often necessary that the ac excitation light produce an ac signal and that the dc bias light and bias voltage produce a dc signal.
Direct current bias light selection: after the spectral responses of the sub-junctions are obtained in step S1, the digital micromirror array is controlled to select probe light that does not respond to the sub-junction under test, and the dc bias light is selected to have a spectral range as wide as possible in order to use the energy of the broadband light source as much as possible. Taking a three-junction battery as an example, a broadband light source which does not respond to the first-junction battery but responds to the second-junction battery and the third-junction battery is selected as direct-current bias light when the first-junction battery is tested, and meanwhile alternating-current excitation light which only responds to the first-junction battery is selected. This is achieved by adjusting the column and row intervals of the loaded picture.
As shown in fig. 2, after being dispersed by the grating 23, a light color band with a certain spectral width passes through the focusing mirror 24 and is focused on a gray part pixel (gray arrow represents an adjustable monochromatic light beam with a certain spectral width) on the digital micro-mirror array 25, and as mentioned above, the digital micro-mirror array 25 realizes that a light beam with a certain spectral distribution and light intensity is simultaneously output as direct current bias light of an unmeasured sub-junction and alternating current excitation light modulated by a certain frequency through loading pictures.
And S6, projecting the alternating current excitation light and the direct current bias light into a light path collimation homogenizer and then synchronously irradiating the alternating current excitation light and the direct current bias light on the tested multi-junction laminated cell.
And S7, loading preset bias voltage on the tested multi-junction laminated battery, transmitting signals obtained through the positive electrode and the negative electrode of the battery to a pre-amplifier, outputting the signals to a phase-locked amplifier, obtaining average signals of a plurality of periods through a certain integration time of the phase-locked amplifier, and finally outputting response photocurrent signals of the tested sub-junction under a certain monochromatic excitation light.
And S8, switching the wavelength and the light intensity of the adjustable monochromatic light by sequentially switching pictures with different wavelength codes, and obtaining a spectral responsivity curve of the measured sub-junction under the adjustable monochromatic light.
Taking a three-junction battery as an example, applying direct current bias light and adjustable monochromatic light of a first/second/third junction respectively to obtain the spectral responsivity curve of each sub-junction of the multi-junction battery.
Device embodiment
In another embodiment of the present invention, a multi-junction battery spectral responsivity test device is disclosed, as shown in fig. 2, comprising a light source unit 1 and a grating micromirror array dimming module.
And the light source unit 1 is used for providing a basic light source for the grating micro-mirror array dimming module.
Preferably, the light source unit 1 is a steady-state broad spectrum light source of high energy density, such as a high-power xenon lamp light source or a laser-driven white light source.
The grating micro-mirror array dimming module is used for simultaneously outputting direct current bias light with a spectrum range and adjustable monochromatic alternating current excitation light, and comprises:
An entrance slit 21 for adjusting the generation of different slit widths, based on which the spectral resolution of the light from the light source unit 1 is adjusted.
Illustratively, the entrance slit 21 is a rectangular adjustable slit with a slit width adjustable in the range of 20um-3mm.
A collimator mirror 22 for reflecting light from the entrance slit 21 to the grating 23.
And a grating 23 for dispersing the light passing through the entrance slit 21.
A focusing mirror 24 for focusing the light from the grating 23 and reflecting the light to a digital micromirror array 25.
The control unit 27 loads, switches and transmits the picture data encoded by different wavelengths, and controls the digital micromirror array 25 at a preset frequency to simultaneously output the dc bias light and the ac excitation light, so that the digital micromirror array 25 projects a light beam with a specific spectral distribution and a light source modulation frequency.
Specifically, the control unit 27 loads picture data of different resolutions at a certain frequency, and controls the rows and columns of the digital micromirror array 25 based on the picture data to achieve resolution and intensity adjustment of the output light.
The digital micromirror array 25 is used for performing digital optical processing on the light from the focusing mirror 24, outputting a light beam with specific spectral distribution and light source modulation frequency, and outputting direct current bias light and alternating current excitation light as test light sources for accurately measuring the multi-junction laminated cell.
And the optical path collimation homogenizer 26 is used for synchronously irradiating the alternating current excitation light and the direct current bias light on the tested multi-junction laminated cell.
Illustratively, the digital micromirror array is mainly composed of a two-dimensional micromirror array, and 50-130 tens of thousands of micromirrors are gathered on a CMOS silicon substrate on each device. Each micro-lens represents one pixel, and the conversion speed can reach 1 KHz-1 MHz. Each lens is about 10 μm in size and can be adjusted in direction and angle. The hinge rotating device is arranged below the CMOS silicon substrate, and the rotation of the micro lens is controlled by a digital driving signal and can be automatically controlled and driven by a program. When the digital signal is written, the hinge rotation device rotates, and the lens also rotates. When the lens is in an open state, the lens is inclined by 12 degrees, and the incident light is turned to the main projection direction; when in the off state, the lens is tilted by-12 °, turning the incident light in the other direction. The storage unit under each lens is addressed by the addressing motor through binary plane signals, so that the time for keeping each lens on/off is controlled.
The digital micromirror array 25 can reflect the required light and absorb the unnecessary light by the program control, and can not only adjust the spectrum range of the output light but also adjust the spectrum shape of the output by adjusting the number of the on-state light of the micromirrors at each spectrum band position by the organic cooperation with other elements. Through the digital micromirror array 25, each lens switch and switch frequency can be independently adjusted, a light beam with specific spectral distribution and light source modulation frequency can be output, and direct current bias light and alternating current excitation light can be simultaneously output as a test light source of the multi-junction battery, so that accurate measurement is realized.
Further, the multi-junction cell spectral responsivity test device further comprises a signal detection unit and a multi-junction laminated cell unit 4.
The signal detection unit is electrically connected to the multi-junction laminated battery cell 4, and is configured to detect an electrical signal of the multi-junction laminated battery cell 4.
The multi-junction stacked cell 4 is a cell to be tested and may be a single junction cell or a multi-junction cell. Preferably, the multi-junction stacked cell 4 is a monolithic multi-junction cell.
Further, the signal detection unit includes a bias voltage source 31, a preamplifier 32, a lock-in amplifier 33 and a data acquisition module 34 electrically connected in sequence.
Wherein, the bias voltage source 31 is electrically connected with the multi-junction laminated cell 4 and is used for providing bias voltage; the preamplifier 32 is configured to perform a current-voltage gain with a certain coefficient on the obtained photocurrent signal, and convert the current-voltage gain into a voltage signal; the signal of the pre-amplifier 32 is further input to a lock-in amplifier 33 to separate an alternating current signal, and a signal acquisition module 34 is used for acquiring a circuit of a test signal to obtain a spectral response signal of a tested sub-junction of the tested multi-junction laminated battery.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.
Claims (10)
1. A method for testing spectral responsivity of a multi-junction cell, comprising:
s2, using a steady-state broad-spectrum light source with high energy density as a light source, and irradiating the light source to an incident crack through collimation and focusing;
s3, reflecting the light from the incident slit to the grating through the collimating mirror, and dispersing through the grating;
s4, focusing the light from the grating through a focusing mirror, and reflecting and conveying the light to a digital micro-mirror array;
Step S5, loading, switching and sending picture data coded by different wavelengths through a control unit, and controlling the digital micro-mirror array to simultaneously output direct-current bias light and alternating-current excitation light at a preset frequency, so that the digital micro-mirror array projects light beams with specific spectral distribution and light source modulation frequency;
s6, projecting the alternating current excitation light and the direct current bias light into a light path collimation light equalizer and then synchronously irradiating the alternating current excitation light and the direct current bias light on a tested multi-junction laminated cell;
Step S7, loading preset bias voltage on the tested multi-junction laminated battery, transmitting signals obtained through the positive electrode and the negative electrode of the battery to a pre-amplifier, outputting the signals to a phase-locked amplifier, obtaining average signals of a plurality of periods through integration time by the phase-locked amplifier, and finally outputting response photocurrent signals of the tested sub-junction under a certain monochromatic excitation light;
And S8, switching the wavelength and the light intensity of the adjustable monochromatic light by sequentially switching the picture data encoded by different wavelengths, and obtaining a spectral responsivity curve of the measured sub-junction under the adjustable monochromatic light.
2. The method for testing the spectral responsivity of a multi-junction cell according to claim 1, further comprising, prior to step S2:
Step S1, testing spectral response characteristics of a single-piece single-junction battery of each sub-junction, and respectively determining the spectral range of direct current bias light and the response light intensity of each tested sub-junction of the multi-junction laminated battery to be tested and the spectral range of alternating current excitation light and the response light intensity according to test results.
3. The method of testing the spectral responsivity of a multi-junction cell of claim 1, further comprising: and adjusting the entrance slit according to the parameters of the grating, and changing the size of the light spot irradiated on the digital micromirror array by adjusting the slit width of the entrance slit.
4. The method for testing the spectral responsivity of a multi-junction cell according to claim 1, wherein the method comprises the following steps: the picture data comprises a digital code corresponding to direct current bias light or a digital code corresponding to alternating current excitation light or both the digital code corresponding to the direct current bias light and the digital code corresponding to the alternating current excitation light;
and in the step S5, alternating current excitation light and direct current bias light are obtained through loading and switching the picture data.
5. A multi-junction cell spectral responsivity test device, comprising: a light source unit and a grating micro-mirror array dimming module; wherein,
The light source unit is used for providing a basic light source for the grating micro-mirror array dimming module;
The grating micro-mirror array dimming module is used for simultaneously outputting direct current bias light with a spectrum range and adjustable monochromatic alternating current excitation light, and comprises:
an entrance slit for adjusting to generate different slit widths, the spectral resolution of light from the light source unit being adjusted based on the different slit widths;
A collimator mirror for reflecting light from the entrance slit to the grating;
A grating for dispersing light passing through the entrance slit;
The focusing mirror is used for focusing the light rays from the grating and reflecting and conveying the light rays to the digital micro-mirror array;
The control unit is used for loading, switching and sending picture data coded by different wavelengths, and controlling the digital micromirror array to simultaneously output direct current bias light and alternating current excitation light at a preset frequency; the picture data comprises a digital code corresponding to direct current bias light or a digital code corresponding to alternating current excitation light or both the digital code corresponding to the direct current bias light and the digital code corresponding to the alternating current excitation light;
the digital micro mirror array is used for carrying out digital optical processing on the light rays from the focusing mirror, outputting light beams with specific spectral distribution and light source modulation frequency, and outputting direct current bias light and alternating current excitation light as test light sources for measuring the multi-junction laminated battery.
6. The multi-junction cell spectral responsivity test apparatus of claim 5, wherein said light source unit is a high energy density steady state broad spectrum light source.
7. The multi-junction cell spectral responsivity test device of claim 5, wherein said entrance slit is a rectangular adjustable slit with a slit width adjustable in the range of 20um-3mm.
8. The multi-junction cell spectral responsivity test apparatus of claim 5, further comprising: a multi-junction stacked cell; the multi-junction stacked cell comprises a single junction cell or a multi-junction stacked cell.
9. The multi-junction cell spectral responsivity test apparatus of claim 8, further comprising:
And the signal detection unit is electrically connected with the multi-junction laminated battery unit and is used for detecting the electric signals of the multi-junction laminated battery unit.
10. The multi-junction battery spectral responsivity test device according to claim 9, wherein the signal detection unit comprises a bias voltage source, a preamplifier, a lock-in amplifier and a data acquisition module which are electrically connected in sequence; wherein,
The bias voltage source is electrically connected with the multi-junction laminated battery cell and is used for providing bias voltage;
The preamplifier is used for carrying out current-voltage gain with a certain coefficient on the obtained photocurrent signal and converting the current-voltage gain into a voltage signal;
the phase-locked amplifier is used for separating an alternating current signal from a signal output by the pre-amplifier;
and the signal acquisition module is used for acquiring the test signal to obtain the spectrum response signal of the tested sub-junction of the multi-junction laminated battery unit.
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