JP2016192827A - Selecting device for reference solar battery, selecting method for reference solar battery and method of manufacturing solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide selecting device and method for a reference solar battery that can reduce evaluation error as compared with prior arts, and to provide a method of manufacturing a solar battery module that is evaluated with high precision by using a selected reference solar battery.SOLUTION: A light irradiation device for irradiating a solar battery with light is provided. The light irradiation device is capable of irradiating light under a reference irradiation condition, a first element irradiation condition, a second element irradiation condition, and a third element irradiation condition. In each solar battery, the product of the rate of short-circuit current under the first element irradiation condition, the rate of short-circuit current under the second element irradiation condition, and the rate of short-circuit current under the third element irradiation condition to short-circuit current under the reference irradiation condition is calculated. The average value of the products of the short-circuit current rates of plural solar batteries is compared with the product of the short-circuit current rates of each solar battery. A solar battery having the short-circuit rate product which is nearest to the average value is selected as a reference solar battery.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a reference solar cell sorting device used for adjustment of a solar simulator or the like. The present invention also relates to a method for selecting a reference solar cell. Furthermore, it is related with the manufacturing method of the solar cell module which adjusts a solar simulator with the selected reference | standard solar cell and evaluates a solar cell.

Conventionally, when solar cell modules are industrially mass-produced, for example, solar cell modules may be produced using different production lines at a plurality of bases. In addition, a plurality of production lines may be provided at a single base, and solar cell modules may be produced using different production lines.
In order to ensure the same quality for solar cell modules produced using different production lines such as these, the quality of the solar cell module that is a work-in-process of the solar cell module and that actually performs photoelectric conversion is the same It is necessary to evaluate with. In other words, when accurately determining the quality of the solar cell based on a uniform standard, it is necessary to determine the same conditions in any production line.

As a method for evaluating the quality of a solar cell, for example, there is a method of measuring photoelectric conversion characteristics by IV measurement of a solar cell.
Specifically, standard measurement conditions (hereinafter also referred to as STC conditions) of 25 ° C., air mass 1.5, 1000 W / m ² are formed by a solar simulator, and a solar cell manufactured under these conditions is subjected to IV measurement. Quality is evaluated from IV characteristics. The standard measurement conditions are adjusted by selecting a reference solar cell that represents the variation in relative spectral sensitivity of the manufactured solar cell and adjusting the irradiance using the reference solar cell. That is, in order to form a common standard measurement condition at each production site, it is necessary to select a reference solar cell with extremely close quality.

Conventionally, as a method for selecting the reference solar cell, there is a two-light source method according to JIS C8904-2.
In this two-light source method, light is irradiated to each solar cell to be selected using two stable light sources, and the ratio of the short-circuit current values at each light source is measured by each solar cell. And the average value of the ratio of the said short circuit current value of each solar cell and the ratio of the said short circuit current value of each solar cell are compared, and the solar cell close | similar to an average value is selected as a reference | standard solar cell.

JP 2006-135196 A

Incidentally, in recent years, multijunction solar cells in which three or more element cells having different relative spectral sensitivities are joined have been developed. This multi-junction solar cell can perform photoelectric conversion in a wide wavelength region by performing photoelectric conversion in each element cell, and can secure high conversion efficiency.
On the other hand, in the case of this multi-junction solar cell, photoelectric conversion is performed in each of the three or more element cells, so that the relative spectral sensitivity is likely to shift, and individual differences between solar cells are likely to increase. Therefore, if an appropriate reference solar cell is not selected, there is a possibility that a large evaluation error of the solar cell will occur.

In the case of the two light source method described above, the short-circuit current ratio between the two light sources is taken. However, in the case of a three-junction solar cell, the short circuit current is determined by the three element cells. For example, even if the performance of one element cell out of the three element cells is deviated from the average, it is selected as the reference solar cell. There is a fear. Therefore, there may be a case where a reference solar cell that truly represents a variation in relative spectral sensitivity of a group of solar cells that are a group to be measured cannot be selected.
If the solar simulator is adjusted using such a reference solar cell, the solar simulator may not be adjusted accurately and may not be able to meet common evaluation conditions. If the evaluation conditions are deviated, the evaluation of the solar cell as a product is greatly different depending on the production base, and there is a possibility that a solar cell module with stable quality cannot be manufactured.

  Accordingly, an object of the present invention is to provide a reference solar cell sorting apparatus and sorting method that can reduce evaluation errors as compared with the conventional art. Moreover, it aims at providing the manufacturing method of the solar cell module evaluated more accurately using the selected reference | standard solar cell.

In response to the above problems, the present inventor has tried to improve the sorting accuracy by applying the two light source method. That is, two light sources with different radiant energy were prepared in accordance with the maximum absorption wavelength corresponding to the maximum value of the relative spectral sensitivity of each element cell, and an attempt was made to select the reference solar cell from the short-circuit current ratio. .
Specifically, for the three-junction solar cell in which the top cell, middle cell, and bottom cell are stacked in this order from the light irradiation side, the relative spectral sensitivity of each element cell is measured, and the maximum value of each relative spectral sensitivity is obtained. Identify the corresponding maximum absorption wavelength. And two light which restricted the radiant energy according to the two element cells with the longest wavelength was prepared, and the short circuit current was measured using the two light. The reference solar cells were selected based on the short-circuit current ratio obtained from the measurement results.

However, although the selected reference solar cell has greatly improved the sorting accuracy as compared with the conventional two-light source method in which only two light sources are prepared, it has not been able to obtain a sufficient accuracy as expected.
Therefore, the present inventor selects the reference solar cell by increasing the types of light to be irradiated and increasing the number of measurement points, calculating the short-circuit current ratio in each light. It was considered that this would increase the sorting accuracy.

The invention according to claim 1, which is derived based on such consideration, is a reference solar cell sorting device that sorts a reference solar cell from a plurality of solar cells. It has at least three element cells having different maximum absorption wavelengths corresponding to the maximum value of sensitivity, and the three element cells are composed of a first element cell, a second element cell, and a third element cell, It has a light irradiation apparatus which irradiates light with respect to a solar cell, The said light irradiation apparatus can irradiate light on condition of any of following (1)-(4) at least, and with respect to each solar cell Light irradiation under one condition selected from the following (1) to (4), and in each solar cell, the following first element irradiation condition for the short-circuit current under the reference irradiation condition of irradiating light of a predetermined irradiance Short-circuit current ratio at 1st short The first short-circuit current calculated by calculating the current ratio, the second short-circuit current ratio as the short-circuit current ratio under the following second element irradiation condition, and the third short-circuit current ratio as the short-circuit current ratio under the following third element irradiation condition The product of the short-circuit current ratio obtained by multiplying the ratio, the second short-circuit current ratio, and the third short-circuit current ratio, and the average value of the products of the short-circuit current ratios in the plurality of solar cells, and the short-circuit current of each solar cell This is a reference solar cell sorting device that compares products of ratios and sorts solar cells having a short-circuit current ratio product closest to the average value as reference solar cells.
(1) A first element irradiation condition for irradiating light having a smaller radiation energy at the maximum absorption wavelength of the first element cell than the reference irradiation condition, and a radiant energy at the maximum absorption wavelength of the second element cell than the reference irradiation condition. A second element irradiation condition for irradiating light with a small value, and a third element irradiation condition for irradiating light having a smaller radiation energy at the maximum absorption wavelength of the third element cell than the reference irradiation condition.
(2) a first element irradiation condition for irradiating light having a larger radiation energy at the maximum absorption wavelength of the first element cell than the reference irradiation condition; and a radiation energy at the maximum absorption wavelength of the second element cell than the reference irradiation condition. A second element irradiation condition for irradiating light with a large current, and a third element irradiation condition for irradiating light having a larger radiation energy at the maximum absorption wavelength of the third element cell than the reference irradiation condition.
(3) Of the maximum absorption wavelengths of the three element cells, the first element irradiation condition for irradiating light with the smallest radiation energy at the maximum absorption wavelength of the first element cell and the maximum absorption wavelength of the second element cell A second element irradiation condition for irradiating light with low radiant energy and a third element irradiation condition for irradiating light with the lowest radiant energy at the maximum absorption wavelength of the third element cell.
(4) Among the maximum absorption wavelengths of the three element cells, the first element irradiation condition for irradiating light having the largest radiation energy at the maximum absorption wavelength of the first element cell and the maximum absorption wavelength of the second element cell A second element irradiation condition for irradiating light having a large radiation energy and a third element irradiation condition for irradiating light having the largest radiation energy at the maximum absorption wavelength of the third element cell.

According to the configuration of the present invention, unlike the conventional two-light source method, in each of the plurality of solar cells, the maximum value of the relative spectral sensitivity of each of the first element cell, the second element cell, and the third element cell is obtained. Light with increased or decreased radiant energy is prepared in accordance with the corresponding maximum absorption wavelength, and the product of the short-circuit current ratio is calculated for each solar cell. And the average value of the short circuit current ratio of the calculated solar cell is calculated, and it compares with the short circuit current ratio of each solar cell, and makes the nearest solar cell the reference solar cell.
In other words, each solar cell is irradiated with light under one common condition selected from (1) to (4), and the photoelectric of each of the first element cell, the second element cell, and the third element cell in each solar cell. Based on the conversion characteristics, the reference solar cell is selected based on the product of the short-circuit current ratio, which is a relative value, so that it can be selected according to a group of solar cells to be selected, compared to the conventional one. A reference solar cell with relative spectral sensitivity that is more average and representative of a group of solar cells can be selected.
Here, the conditions (1) to (4) will be further described.
The condition of (1) is that if the radiation energy at the maximum absorption wavelength of the first element cell, the second element cell, and the third element cell in the reference irradiation condition is α0, β0, and γ0, respectively, The radiation energy at the maximum absorption wavelength of the first element cell is α1 (<α0), and the second element irradiation condition is that the radiation energy at the maximum absorption wavelength of the second element cell is β1 (<β0). Is a condition in which the radiation energy at the maximum absorption wavelength of the second element cell is γ1 (<γ0).
The condition of (2) is that when the radiation energy at the maximum absorption wavelength of the first element cell, the second element cell, and the third element cell in the reference irradiation condition is α0, β0, and γ0, respectively, the first element irradiation condition is The radiant energy at the maximum absorption wavelength of the first element cell is α2 (> α0), and the second element irradiation condition is that the radiant energy at the maximum absorption wavelength of the second element cell is β2 (> β0). Is a condition in which the radiation energy at the maximum absorption wavelength of the second element cell is γ2 (> γ0).
The condition (3) is that if the radiant energy at the maximum absorption wavelength of the first element cell, the second element cell, and the third element cell is α, β, and γ, respectively, the first element irradiation condition is α3 <β3 and The condition of α3 <γ3 is satisfied, the second element irradiation condition is a condition of β4 <α4 and β4 <γ4, and the third element irradiation condition is a condition of γ5 <α5 and γ5 <β5.
The condition of (4) is that if the radiation energy at the maximum absorption wavelengths of the first element cell, the second element cell, and the third element cell are α, β, and γ, respectively, the first element irradiation condition is α6> β6 and The condition of α6> γ6 is satisfied, the second element irradiation condition is a condition of β7> α7 and β7> γ7, and the third element irradiation condition is a condition of γ8> α8 and γ8> β8.

The invention according to claim 2 is such that the solar cell is laminated in the order of the first element cell, the second element cell, and the third element cell from the light irradiation side, and the light irradiation device includes a light source, A limiting filter, which restricts the radiant energy preferentially at the maximum absorption wavelength of the second element cell, and allows the solar cell to pass through the limiting filter from a light source under the second element irradiation condition. The reference solar cell sorting device according to claim 1, wherein the light is irradiated with light.
Neka

“To squeeze the radiant energy” here means to squeeze the radiant energy at the maximum absorption wavelength of the transmitted light from the limiting filter to be smaller than the radiant energy at the maximum absorption wavelength of the incident light to the limiting filter. .
In addition, “squeezing radiant energy preferentially at the maximum absorption wavelength of an element cell” means that the radiant energy at the maximum absorption wavelength of a specific element cell is smaller than the radiant energy at the maximum absorption wavelength of other element cells. It means to narrow down the radiant energy.

  According to the configuration of the present invention, since the radiant energy is reduced using the limiting filter, an existing light source can be used, and light having a different irradiation energy in a specific wavelength region as compared with a case where a new light source is separately provided. Can be irradiated at low cost.

  The invention according to claim 3 is the reference solar cell according to claim 2, wherein the limiting filter has a transmittance of 20% to 80% at the maximum absorption wavelength of the second element cell. Sorting device.

According to the configuration of the present invention, the limiting filter has a transmittance of 20% to 80% at the maximum absorption wavelength of the second element cell. That is, in the second element irradiation condition, the light from the light source is focused to radiant energy of 20% to 80% by the limiting filter.
If it is this range, since radiant energy will not be restrict | limited too much, a change will not arise easily in the photoelectric conversion performance of the solar cell by the restriction | limiting of radiant energy. Further, since the amount of change in radiant energy is not too small, it is easy to separate from other element cells.

  According to a fourth aspect of the present invention, in the limiting filter, the transmittance at the maximum absorption wavelength of the second element cell is smaller than the transmittance at the maximum absorption wavelength of the first element cell. Alternatively, the reference solar cell sorting apparatus according to 3.

  According to the configuration of the present invention, the transmittance at the maximum absorption wavelength of the first element cell and the transmittance at the maximum absorption wavelength of the second element cell take different values, and the transmittance at the maximum absorption wavelength of the second element cell is Since it is smaller than the transmittance at the maximum absorption wavelength of the single element cell, it is easy to generate light whose radiant energy is preferentially reduced at the maximum absorption wavelength of the second element cell.

  Here, in the above-described invention, since each element cell is electrically connected in series, the short circuit current reflects the short circuit current of the lowest element cell in principle.

  Therefore, when the relative spectral sensitivity with respect to each absorption wavelength is graphed for each of the first element cell, the second element cell, and the third element cell, the invention according to claim 5 is configured such that the limiting filter is The radiant energy is preferentially reduced in the range from the wavelength corresponding to the intersection of the graph of the first element cell and the graph of the second element cell to the wavelength corresponding to the intersection of the graph of the second element cell and the third element cell. A reference solar cell sorting apparatus according to any one of claims 2 to 4.

  According to the configuration of the present invention, the range from the wavelength corresponding to the intersection of the graph of the first element cell and the graph of the second element cell to the wavelength corresponding to the intersection of the graph of the second element cell and the graph of the third element cell. Priority is given to radiant energy. That is, since the radiant energy is reduced in the wavelength range where the second element cell mainly senses light, the influence of the second element cell on the short-circuit current can be increased.

  The invention according to claim 6 is characterized in that the reference irradiation condition is any one of a first element irradiation condition, a second element irradiation condition, a third element irradiation condition, and a standard measurement condition. It is a sorting device of the standard solar cell in any one of -5.

According to the configuration of the present invention, the reference irradiation condition is one of the first element irradiation condition, the second element irradiation condition, the third element irradiation condition, and the standard measurement condition.
That is, in the above (1) and (2), the reference irradiation condition is the standard measurement condition, and in the above (3) and (4), the reference irradiation condition is the first element irradiation condition and the second element irradiation condition. , The third element irradiation condition, and the standard measurement condition.
For example, in (3) or (4), when the reference irradiation condition is the first element irradiation condition, the first short circuit that is the short circuit current ratio in the first element irradiation condition to the short circuit current in the first element irradiation condition The current ratio, the second short-circuit current ratio that is the short-circuit current ratio under the second element irradiation condition, and the third short-circuit current ratio that is the short-circuit current ratio under the third element irradiation condition are calculated. The product of the short-circuit current ratio obtained by multiplying the second short-circuit current ratio and the third short-circuit current ratio is calculated, and the average value of the products of the short-circuit current ratios in the plurality of solar cells is compared with the product of the short-circuit current ratios of the solar cells. Then, the solar cell having the product of the short circuit current ratio closest to the average value is selected as the reference solar cell.

  In the above-described invention, the reference irradiation condition may be any one of a first element irradiation condition, a second element irradiation condition, and a third element irradiation condition.

  According to the present invention, the reference solar cell can be selected by measuring under the three conditions of the first element irradiation condition, the second element irradiation condition, and the third element irradiation condition. The work efficiency may be improved.

  In the above-described invention, it is preferable to select a reference solar cell from 10 to 30 solar cells.

  According to the configuration of the present invention, the number of measurements is not too large while obtaining a certain level of accuracy.

  In the above-described invention, a sorting device that sorts a reference solar cell from 10 to 30 solar cells, the average value of the products of the short-circuit current ratios in the plurality of solar cells, and the solar cell It is preferable to compare the products of the short-circuit current ratios, and select 2 to 4 solar cells as reference solar cells in order from the average value.

  According to the configuration of the present invention, since 2 to 4 solar cells are selected as reference solar cells from 10 to 30 solar cells, the solar simulator can be adjusted at a plurality of locations.

The invention according to claim 7 is a reference solar cell selection method for selecting a reference solar cell from a plurality of solar cells, wherein each of the plurality of solar cells has a maximum absorption wavelength corresponding to a maximum value of relative spectral sensitivity. Have at least three element cells different from each other, and each of the three element cells includes a first element cell, a second element cell, and a third element cell, and irradiates light to the solar cell. Using the irradiation device, each solar cell is irradiated with light under one condition selected from the following (5) to (8), and each solar cell is irradiated with light having a predetermined irradiance. The first short-circuit current ratio as the short-circuit current ratio under the following first element irradiation condition, the second short-circuit current ratio as the short-circuit current ratio under the following second element irradiation condition, and the following third element irradiation condition with respect to the short-circuit current at Short-circuit current ratio at 3rd short A current ratio is calculated, a product of the calculated short-circuit current ratio obtained by multiplying the calculated first short-circuit current ratio, the second short-circuit current ratio, and the third short-circuit current ratio is calculated, and the product of the short-circuit current ratios in the plurality of solar cells. A solar cell having a product of the short-circuit current ratio closest to the average value is selected as a reference solar cell. Is the method.
(5) A first element irradiation condition for irradiating light having a smaller radiation energy at the maximum absorption wavelength of the first element cell than the reference irradiation condition, and a radiant energy at the maximum absorption wavelength of the second element cell than the reference irradiation condition. A second element irradiation condition for irradiating light with a small value, and a third element irradiation condition for irradiating light having a smaller radiation energy at the maximum absorption wavelength of the third element cell than the reference irradiation condition.
(6) A first element irradiation condition for irradiating light having a larger radiation energy at the maximum absorption wavelength of the first element cell than the reference irradiation condition, and a radiant energy at the maximum absorption wavelength of the second element cell than the reference irradiation condition. A second element irradiation condition for irradiating light with a large current, and a third element irradiation condition for irradiating light having a larger radiation energy at the maximum absorption wavelength of the third element cell than the reference irradiation condition.
(7) Of the maximum absorption wavelengths of the three element cells, the first element irradiation condition for irradiating light with the smallest radiant energy at the maximum absorption wavelength of the first element cell and the maximum absorption wavelength of the second element cell A second element irradiation condition for irradiating light with low radiant energy and a third element irradiation condition for irradiating light with the lowest radiant energy at the maximum absorption wavelength of the third element cell.
(8) Of the maximum absorption wavelengths of the three element cells, the first element irradiation condition for irradiating light having the largest radiation energy at the maximum absorption wavelength of the first element cell and the maximum absorption wavelength of the second element cell A second element irradiation condition for irradiating light having a large radiation energy and a third element irradiation condition for irradiating light having the largest radiation energy at the maximum absorption wavelength of the third element cell.

  According to the screening method of the present invention, each solar cell is irradiated with light under one common condition selected from (5) to (8), and the first element cell, the second element cell, and the first element of each solar cell are irradiated. Based on the photoelectric conversion characteristics of each of the three element cells, the reference solar cells are selected based on the product of the short-circuit current ratio, which is a relative value, so that a group of solar cells that are more subject to selection than in the past Therefore, a reference solar cell having a relative spectral sensitivity that is more average and representative of a group of solar cells can be selected.

  The invention according to claim 8 is a solar cell module manufacturing method using a reference solar cell selected by the reference solar cell selection method according to claim 7 and a light generator that generates light of a predetermined irradiance. The method includes a solar cell forming step of forming a solar cell, an illuminance adjustment step of adjusting an irradiance of light irradiated from the light generation device using the reference solar cell, and an illuminance adjustment step by the illuminance adjustment step. It is the manufacturing method of the solar cell module characterized by including the evaluation process which irradiates the light which adjusted A to the said solar cell, and evaluates the photoelectric conversion characteristic of a solar cell.

  According to the manufacturing method of the present invention, the irradiance of the light generator is adjusted based on the precisely adjusted reference solar cell in the illuminance adjustment step, so that the photoelectric conversion characteristics of the solar cell can be evaluated in the subsequent evaluation step. . Therefore, it is possible to manufacture a solar cell module having a small individual difference and maintaining a certain quality or higher.

According to the reference solar cell sorting apparatus and sorting method of the present invention, the evaluation error can be reduced as compared with the conventional case.
According to the method for manufacturing a solar cell module of the present invention, a solar cell module evaluated with higher accuracy can be manufactured.

It is a mimetic diagram of the sorting device of a 1st embodiment of the present invention. It is explanatory drawing of the limiting filter used for the sorting apparatus of FIG. 1, the upper figure is a graph showing the transmittance | permeability of a filter, and the lower figure is a graph showing the relative spectral sensitivity of each element cell of a solar cell. It is sectional drawing which showed typically the solar cell used as selection object, and hatching is abbreviate | omitted in order to make an understanding easy. 4 is a graph showing the relative spectral sensitivity of each element cell of a solar cell to be selected in Example 1.

  Hereinafter, embodiments of the present invention will be described in detail. In the following description, physical properties are based on standard conditions (25 ° C., 1 atm) unless otherwise specified.

The reference solar cell sorting apparatus 1 according to the first embodiment of the present invention includes a reference solar cell 100a serving as an index of the solar cell 100 to be commercialized from the solar cells 100 that are work-in-progress of the solar cell module 101. A sorting device for sorting.
The reference solar cell 100a is a solar cell specially calibrated from among a large number of solar cells 100, and is for adjusting the irradiance of a light generator such as a solar simulator.

  As shown in FIG. 1, the sorting device 1 includes a light source device 2, an adjustment filter 3, a light transmission member 5, a limiting filter 6, a stage 7, a spectral sensitivity measuring device 8, and a current / voltage measuring device 10. It has.

The light source device 2 is a light irradiation device that irradiates the solar cell 100 with light, and can irradiate the irradiation light as pulsed light having a light emission time of about 0.001 seconds to 0.1 seconds.
The light source device 2 is a light source that combines a plurality of lamps, and can adjust the irradiation light to a desired irradiance.
In the present embodiment, the light source device 2 is configured by combining a xenon lamp and a halogen lamp.

The adjustment filter 3 is a filter that brings light emitted from the light source device 2 closer to pseudo-sunlight that approximates sunlight. That is, the adjustment filter 3 is a filter that adjusts radiant energy in a desired wavelength region.
The adjustment filter 3 is not particularly limited as long as the spectrum of the irradiation light from the light source device 2 can be approximated to the spectrum of sunlight, and may be an air mass filter, or one or a plurality of shielding radiant energy in a specific wavelength region. The cut filter may be combined.

The light transmission member 5 is a transparent plate-like member, and is a member that transmits light from the light source device 2 side to the limiting filter 6 side.
The light transmission member 5 is not particularly limited as long as it has translucency, and an acrylic plate, a glass plate, or the like can be adopted.

  The limiting filter 6 is a filter that preferentially limits radiant energy (amount of light when viewed from the limiting filter 6 side) in a predetermined wavelength range. Specifically, the limiting filter 6 is a color filter that passes a specific wavelength range and blocks the specific wavelength range.

  The stage 7 is a base for fixing the solar cell 100 that is a light irradiation target, and can be fixed so that the light receiving surface faces the incident side.

  The spectral sensitivity measuring device 8 is a device that irradiates a solar cell with monochromatic light of constant energy and constant photons having no wavelength dependence, and measures the spectral sensitivity characteristics and quantum efficiency of each solar cell 100.

  The current-voltage measuring device 10 is a device that measures the current-voltage characteristics of the solar cell 100.

  The solar cell module 101 incorporates the solar cell 100 and has a wiring member, a frame, and the like attached to the solar cell 100.

  As shown in FIG. 2, the solar cell 100 is a solar cell including three element cells 125, 126, and 127 having different maximum absorption wavelengths corresponding to the maximum value of relative spectral sensitivity. That is, the element cells 125, 126, and 127 have different maximum peak positions when the relative spectral sensitivities with respect to the respective absorption wavelengths are plotted and graphed.

Specifically, as shown in FIG. 2, the first element cell 125 has a maximum peak on the low wavelength side, and the third element cell 127 has a maximum peak on the longer wavelength side than the first element cell 125. The second element cell 126 has a maximum peak between the first element cell 125 and the third element cell 127. That is, the graph of the relative spectral sensitivity of the first element cell 125 is shifted to the lower wavelength side than the graph of the relative spectral sensitivity of the second element cell 126, and the graph of the relative spectral sensitivity of the third element cell 127 is The relative spectral sensitivity graph of the two-element cell 126 is shifted to the higher wavelength side.
The maximum absorption wavelength λ1 corresponding to the maximum value of the relative spectral sensitivity of the first element cell 125 is 100 nm or more lower than the maximum absorption wavelength λ2 corresponding to the maximum value of the relative spectral sensitivity of the second element cell 126. The maximum absorption wavelength λ2 corresponding to the maximum value of the relative spectral sensitivity of the second element cell 126 is 100 nm or more lower than the maximum absorption wavelength corresponding to the maximum value of the relative spectral sensitivity λ3 of the third element cell 127.

The graph of the relative spectral sensitivity of the first element cell 125 and the graph of the relative spectral sensitivity of the second element cell 126 have an intersection A that intersects with each other.
The intersection A is an intersection of two adjacent element cells 125 and 126, which is higher in wavelength than the maximum absorption wavelength λ1 of the first element cell 125 and lower than the maximum absorption wavelength λ2 of the second element cell 126. On the wavelength side.
That is, the intersection A is a boundary point at which the dominant factor is switched between the first element cell 125 and the second element cell 126. On the wavelength side lower than the intersection A, the light absorption in the first element cell 125 does not occur. The light absorption in the second element cell 126 becomes dominant, and the light absorption in the second element cell 126 becomes more dominant than the light absorption in the first element cell 125 on the wavelength side higher than the intersection A.

In addition, the graph of the relative spectral sensitivity of the second element cell 126 and the graph of the relative spectral sensitivity of the third element cell 127 include an intersection B that intersects with each other.
The intersection B is an intersection of two adjacent element cells 126 and 127, which is higher in wavelength than the maximum absorption wavelength λ2 of the second element cell 126 and lower than the maximum absorption wavelength λ3 of the third element cell 127. On the wavelength side.
That is, the intersection point B is a boundary point where the dominant factor is switched between the second element cell 126 and the third element cell 127, and light absorption in the second element cell 126 is lower at the lower wavelength side than the intersection point B. The light absorption in the third element cell 127 becomes dominant, and the light absorption in the third element cell 127 becomes more dominant than the light absorption in the second element cell 126 on the wavelength side higher than the intersection B.

Furthermore, the graph of the relative spectral sensitivity of the first element cell 125 and the graph of the relative spectral sensitivity of the third element cell 127 have an intersection C that intersects with each other.
The intersection C is between the intersection A and the intersection B and is between the maximum absorption wavelength λ1 of the first element cell 125 and the maximum absorption wavelength λ3 of the third element cell 127.
The detailed laminated structure of the solar cell 100 will be described later for convenience of explanation.

  Next, a reference solar cell sorting method using the reference solar cell sorting apparatus 1 of the present embodiment will be described.

In the reference solar cell sorting method of the present embodiment, as a preparation for sorting the reference solar cell 100a, a predetermined limit filter 6 is selected from a plurality of types of limit filters 6 as shown in FIG. (Filter selection process).
Specifically, using one solar cell 100, the relative spectral sensitivity of each element cell 125, 126, 127 is measured, and the maximum absorption corresponding to the maximum value of the relative spectral sensitivity of each element cell 125, 126, 127. Each wavelength is calculated.
Then, the limiting filter 6 is installed on the light transmitting member 5, and a filter that preferentially limits the radiant energy in the wavelength region near the maximum absorption wavelength of the specific element cell is selected from the limiting filter 6. In other words, a filter having a small transmittance in the wavelength region near the maximum absorption wavelength of the specific element cell is selected from the limiting filters 6.

In the present embodiment, the limiting filter 6 is selected such that the radiant energy in the vicinity of the maximum absorption wavelength of the second element cell 126 is limited compared to the radiant energy in the vicinity of the maximum absorption wavelength of the other element cells 125 and 127. That is, as shown in FIG. 2, when the maximum absorption wavelengths at which the relative spectral sensitivities of the first element cell 125, the second element cell 126, and the third element cell 217 take peaks are λ1, λ2, and λ3. Then, a filter is selected that has a transmittance that is smaller than the transmittances at wavelengths λ1 and λ3 at the wavelength λ2 that is the restriction target.
In the present embodiment, from the viewpoint of more accurately obtaining the short-circuit current of each element cell 125, 126, 127, as shown in FIG. 2, in the waveform of the second element cell 126, the first element cell 125 and the second element In the wavelength range from the intersection A of the cell 126 to the intersection C of the second element cell 126 and the third element cell 127, a limiting filter that preferentially lowers the radiant energy is selected.

The limiting filter 6 to be selected preferably has a transmittance at a wavelength λ2 of 20% or more and more preferably 30% or more from the viewpoint of preventing a change in photoelectric conversion characteristics of the solar cell 100 to be irradiated. Preferably, it is 35% or more.
The limiting filter 6 to be sorted is preferably 80% or less, more preferably 70% or less, at a wavelength λ2, from the viewpoint of distinguishing the element cell to be restricted from other element cells. It is more preferably 65% or less, and particularly preferably 60% or less.
Further, the limiting filter 6 to be selected has a transmittance at a wavelength λ1 of 100% or less, preferably 90% or less, more preferably 85% or less, and further preferably 80% or less. .
The limiting filter 6 to be sorted has a transmittance at a wavelength λ3 of 100% or less, and preferably 90% or less.
In the limiting filter 6 to be selected, the difference between the transmittance at the wavelength λ2 and the transmittance at the wavelengths λ1 and λ3 is preferably 10% or more, and more preferably 20% or more.

  Subsequently, the reference solar cell 100a is selected from the plurality of solar cells 100 using the limiting filter 6 selected in the filter selection step (reference solar cell selection step).

In the reference solar cell sorting step, n solar cells are removed from a large number of solar cells by removing those having extremely different open voltage, short circuit current, curve factor, appearance, etc. from the average value of the solar cell group consisting of a large number of solar cells 100 in advance. The battery 100 is extracted at random (extraction process).
The number n of solar cells to be extracted is appropriately set depending on the number of reference solar cells to be selected, but is preferably 10 to 30.

  Thereafter, each of the extracted group of solar cells 100 is irradiated with light to measure current-voltage characteristics.

At this time, the short circuit current Isc is obtained for each solar cell 100 under the standard measurement conditions (air mass 1.5, 1000 W / m ² , 25 ° C.) (reference irradiation conditions).
In addition, the first light source device 2 preferentially narrows the radiant energy in the wavelength range near the maximum absorption wavelength corresponding to the maximum peak of the relative spectral sensitivity of the first element cell 125 over the standard measurement condition (reference irradiation condition). The short-circuit current I1 is obtained for each solar cell 100 under the element irradiation conditions. That is, under the first element irradiation condition, light having the smallest radiant energy is irradiated at the maximum absorption wavelength of the first element cell 125 among the maximum absorption wavelengths of the three element cells 125, 126, and 127. In the present embodiment, when the relative spectral sensitivity with respect to each absorption wavelength is graphed in each element cell 125, 126, 127, it corresponds to the rising point D from the low wavelength side of the graph corresponding to the first element cell 125. In the wavelength range from the wavelength to the wavelength corresponding to the intersection A with the graph of the second element cell 126, the light with the radiated energy is preferentially irradiated as compared with the other element cells 126 and 127.
Furthermore, in the second element irradiation condition in which the radiant energy is preferentially reduced by the limiting filter 6 in the wavelength region near the maximum absorption wavelength corresponding to the maximum peak of the relative spectral sensitivity of the second element cell 126 over the standard measurement condition, The short-circuit current I2 is obtained for each solar cell 100. That is, in the second element irradiation condition, light having the smallest radiant energy is irradiated at the maximum absorption wavelength of the second element cell 126 among the maximum absorption wavelengths of the three element cells 125, 126, and 127. In the present embodiment, when the relative spectral sensitivity for each absorption wavelength is graphed in each element cell 125, 126, 127, it corresponds to the intersection A between the graph of the first element cell 125 and the graph of the second element cell 126. In the wavelength range from the wavelength to the wavelength corresponding to the intersection B between the graph of the second element cell 126 and the graph of the third element cell 127, the radiant energy is preferentially reduced compared to the other element cells 125 and 126. Irradiate light.
And by the third element irradiation condition in which the radiation energy is preferentially reduced by the light source device 2 in the wavelength region near the maximum absorption wavelength corresponding to the maximum peak of the relative spectral sensitivity of the third element cell 127 over the standard measurement condition, The short-circuit current I3 is obtained for each solar cell 100. That is, under the third element irradiation condition, light having the smallest radiant energy is irradiated at the maximum absorption wavelength of the third element cell 127 among the maximum absorption wavelengths of the three element cells 125, 126, and 127. In the present embodiment, when the relative spectral sensitivity for each absorption wavelength is graphed in each element cell 125, 126, 127, it corresponds to the intersection B between the graph of the second element cell 126 and the graph of the third element cell 127. In the wavelength region from the wavelength to the wavelength corresponding to the rising point E from the long wavelength side of the third element cell 125, the light with the radiated energy is preferentially irradiated as compared with the other element cells 126 and 127.

Subsequently, each of the short-circuit current I1 under the first element irradiation condition, the short-circuit current I2 under the second element irradiation condition, and the short-circuit current I3 under the third element irradiation condition is divided by the short-circuit current Isc under the standard measurement condition. The first short-circuit current ratio (I1 / Isc) as the short-circuit current ratio under the one-element irradiation condition, the second short-circuit current ratio (I2 / Isc) as the short-circuit current ratio under the second-element irradiation condition, and the short-circuit current under the third element irradiation condition The third short-circuit current ratio (I3 / Isc) is calculated.
A product A (hereinafter also referred to as a product A of the short-circuit current ratio) is calculated by multiplying the short-circuit current ratio of the calculated first element irradiation condition, second element irradiation condition, and third element irradiation condition.

And the average value Ra of the product A of the short circuit current ratio of the n solar cells 100 is calculated, and the product Ra of the short circuit current ratio of each solar cell 100 is compared with the average value Ra of the product of the short circuit current ratio. One to four solar cells 100 are selected as reference solar cells 100a in order from the average value.
In this embodiment, the solar cell 100 that takes the product of the short-circuit current ratio closest to the average value is selected as the reference solar cell 100a.

  Then, the manufacturing method of the solar cell module 101 is demonstrated. In particular, the solar cell evaluation process, which is one of the features of this embodiment, will be described with emphasis, and the remaining processes will be briefly described since they are the same as in the prior art.

First, a solar cell formation process is implemented.
Specifically, the transparent insulating substrate 102 is introduced into a CVD apparatus, and the transparent electrode layer 103 is formed (transparent electrode layer forming step).

  When the transparent electrode layer forming step is completed, each element cell 125, 126, 127 is formed by a CVD apparatus to form the photoelectric conversion layer 105 (photoelectric conversion layer forming step).

When the photoelectric conversion layer forming step is completed, the back electrode layer 106 is formed on the substrate on which the photoelectric conversion layer 105 is formed by a sputtering method, a vacuum evaporation method, or the like (back electrode layer forming step).
The above is the solar cell forming step.

The irradiance of the solar simulator (light generating device) is adjusted using the reference solar cell 100a selected by the sorting device 1 described above (illuminance adjustment step).
And the solar cell 100 formed at the above-mentioned solar cell formation process is evaluated using the solar simulator by which irradiance was adjusted by the illumination intensity adjustment process (evaluation process).
In this evaluation step, a solar cell module 101 is manufactured by connecting a wiring member such as a tab wire to a member that satisfies a predetermined condition and attaching a frame or the like as necessary.

  Finally, the solar cell 100 recommended as a selection target will be described.

  As shown in FIG. 3, the solar cell 100 is obtained by laminating a transparent electrode layer 103, a photoelectric conversion layer 105 including element cells 125, 126, and 127 and a back electrode layer 106 on a transparent insulating substrate 102. .

The transparent insulating substrate 102 is a substrate having transparency and insulation, and is a support substrate that supports each layer.
The transparent insulating substrate 102 is not particularly limited as long as it has transparency and insulating properties. For example, a glass substrate or a transparent resin substrate can be used.
The transparent insulating substrate 102 may be a flexible substrate having flexibility.

The transparent electrode layer 103 is a conductive layer having transparency and conductivity.
The transparent electrode layer 103 is not particularly limited as long as it has electrical conductivity and translucency. For example, a transparent conductive metal such as indium tin oxide (ITO) or zinc oxide (ZnO ₂ ). Organic conductive materials such as oxides and graphene sheets, and conductive metal thin films such as silver, aluminum, and copper can be employed.
The transparent electrode layer 103 may have a single layer structure or a multilayer structure.

  As shown in FIG. 3, the photoelectric conversion layer 105 includes a first element cell 125, a second element cell 126, and a third element cell 127 stacked from the transparent electrode layer 103 side (light incident side). It is configured. That is, the solar cell 100 is a three-junction solar cell in which three element cells 125, 126, and 127 are joined.

  The first element cell 125 functions as a top cell of the photoelectric conversion layer 105 and is an amorphous silicon photoelectric conversion unit.

  The first element cell 125 includes a p-type amorphous semiconductor layer 130, an i-type amorphous semiconductor layer 131, and an n-type amorphous semiconductor layer 132.

The p-type amorphous semiconductor layer 130 is a layer that functions as a p-type semiconductor, for example, a p-type amorphous silicon carbide layer.
The i-type amorphous semiconductor layer 131 is a layer that functions as an i-type semiconductor (substantially intrinsic semiconductor), and is, for example, an i-type amorphous silicon layer.
The n-type amorphous semiconductor layer 132 is a layer that functions as an n-type semiconductor, for example, an n-type amorphous silicon layer.

The second element cell 126 functions as a middle cell of the photoelectric conversion layer 105 and is an amorphous germanium photoelectric conversion unit.
The second element cell 126 is a photoelectric conversion unit including an i-type amorphous silicon germanium semiconductor layer 136.
The second element cell 126 includes a p-type amorphous semiconductor layer 135, an i-type amorphous silicon germanium semiconductor layer 136, and an n-type crystalline semiconductor layer 137.

The p-type amorphous semiconductor layer 135 is a layer that functions as a p-type semiconductor, for example, a p-type amorphous silicon layer.
The i-type amorphous silicon germanium semiconductor layer 136 is a layer that functions as an i-type semiconductor, for example, an i-type amorphous silicon germanium layer.
The n-type crystalline semiconductor layer 137 is a layer that functions as an n-type semiconductor, for example, an n-type crystalline silicon layer.

The third element cell 127 functions as a bottom cell of the photoelectric conversion layer 105 and is a crystalline silicon photoelectric conversion unit.
The third element cell 127 includes a p-type crystalline semiconductor layer 140, an i-type crystalline semiconductor layer 141, and an n-type crystalline semiconductor layer 142.
The p-type crystalline semiconductor layer 140 is a layer that functions as a p-type semiconductor, for example, a p-type crystalline silicon layer.
The i-type crystalline semiconductor layer 141 is a layer that functions as an i-type semiconductor, for example, an i-type crystalline silicon layer.
The n-type crystalline semiconductor layer 142 is a layer that functions as an n-type semiconductor, for example, an n-type crystalline silicon layer.

The back electrode layer 106 is an electrode layer that forms a pair with the transparent electrode layer 103 and functions as an electrode.
The back electrode layer 106 is not particularly limited as long as it has conductivity. For example, metals such as aluminum, silver, gold, copper, platinum, and chromium, metal alloys, and metal composites can be used.
Note that the back electrode layer 106 may have a multilayer structure. For example, the back electrode layer 106 may have a multilayer structure of a transparent conductive oxide layer and a metal layer.

  According to the reference solar cell sorting apparatus 1 of the first embodiment, since the light is adjusted using the limiting filter 6, it can be manufactured at a lower cost than when a new light source is provided.

  According to the reference solar cell sorting method of the first embodiment, the irradiation light is adjusted based on the peak positions of the relative spectral sensitivities of the element cells 125, 126, and 127, so that compared to the conventional two-light source method. The reference solar cell 100a can be selected with high accuracy.

In the first embodiment described above, when selecting the reference solar cell 100a, the short circuit current Isc of the standard measurement condition is calculated, and the first element irradiation condition, the second element irradiation condition with respect to the short circuit current Isc of the standard measurement condition, However, the present invention is not limited to this, and the reference for taking the ratio may not be the short-circuit current Isc of the standard measurement condition. Any short-circuit current may be used as long as it is linked to the individual difference.
A recommended specific example will be described as a second embodiment.

  Hereinafter, the reference solar cell sorting method according to the second embodiment of the present invention will be described.

  In the reference solar cell sorting method of the second embodiment, in the same manner as the reference solar cell sorting method of the first embodiment, as a preparation for sorting the reference solar cell 100a in advance, from among a plurality of types of limiting filters 6, A predetermined limiting filter 6 is selected (filter selection step).

  Subsequently, the reference solar cell 100a is selected from the plurality of solar cells 100 using the limiting filter 6 selected in the filter selection step (reference solar cell selection step).

  In the reference solar cell sorting step, first, as in the first embodiment, n solar cells 100 are extracted from the solar cell 100 group.

  Thereafter, each of the extracted group of solar cells 100 is irradiated with light to measure current-voltage characteristics.

At this time, the light source device 2 is under the first element irradiation condition in which the radiant energy is preferentially reduced in the wavelength region near the maximum absorption wavelength corresponding to the peak of the relative spectral sensitivity of the first element cell 125 than the standard measurement condition. The short-circuit current I1 is obtained for each solar cell 100. That is, under the first element irradiation condition, light having the smallest radiant energy is irradiated at the maximum absorption wavelength of the first element cell 125 among the maximum absorption wavelengths of the three element cells 125, 126, and 127.
Further, the short-circuit current under the second element irradiation condition in which the radiant energy is preferentially reduced by the limiting filter 6 in the wavelength region near the maximum absorption wavelength corresponding to the relative spectral sensitivity peak of the second element cell 126 over the standard measurement condition. I2 is obtained for each solar cell 100.
That is, in the second element irradiation condition, light having the smallest radiant energy is irradiated at the maximum absorption wavelength of the second element cell 126 among the maximum absorption wavelengths of the three element cells 125, 126, and 127.
Then, the light source device 2 is short-circuited under the third element irradiation condition in which the radiant energy is preferentially reduced in the wavelength range near the maximum absorption wavelength corresponding to the relative spectral sensitivity peak of the third element cell 127 over the standard measurement condition. The current I3 is obtained for each solar cell 100.
That is, under the third element irradiation condition, light having the smallest radiant energy is irradiated at the maximum absorption wavelength of the third element cell 127 among the maximum absorption wavelengths of the three element cells 125, 126, and 127.

Subsequently, the short-circuit current I1 under the first element irradiation condition, the short-circuit current I2 under the second element irradiation condition, and the short-circuit current I3 under the third element irradiation condition are respectively converted into the short-circuit current I1, the short-circuit current I2, and the short-circuit current. The ratio of short circuit currents J1, J2, J3 is calculated by dividing by any one of I3, and the product B (J1 × J2 × J3) is calculated.
For example, when dividing by the short-circuit current I1, the first short-circuit current ratio J1 is I1 / I1, the second short-circuit current ratio J2 is I2 / I1, and the third short-circuit current ratio J3 is I3 / I1.
For example, when dividing by the short-circuit current I2, the first short-circuit current ratio J1 is I1 / I2, the second short-circuit current ratio J2 is I2 / I2, and the third short-circuit current ratio J3 is I3 / I2.
For example, when dividing by the short-circuit current I3, the first short-circuit current ratio J1 is I1 / I3, the second short-circuit current ratio J2 is I2 / I3, and the third short-circuit current ratio J3 is I3 / I3.

Then, the average value Rb of the products of the short-circuit current ratios of the n solar cells 100 is calculated, the product R of the short-circuit current ratios of the solar cells 100 is compared with the average value Rb of the products of the short-circuit current ratios, and One to four solar cells 100 are selected as reference solar cells 100a in order from the average value.
In this embodiment, the solar cell 100 that takes the product of the short-circuit current ratio closest to the average value is selected as the reference solar cell 100a.

  According to the reference solar cell selection method of the second embodiment, the reference solar cell 100a can be selected without obtaining the short-circuit current Isc under the standard measurement conditions.

In the above-described embodiment, the radiation energy at the maximum absorption wavelength of each element cell is reduced and reduced in any of the first element irradiation condition, the second element irradiation condition, and the third element irradiation condition. However, the present invention is not limited to this, and the radiant energy at the maximum absorption wavelength of each element cell may be increased.
For example, the short-circuit current I1 is set for each sun under the first element irradiation condition in which the radiant energy is preferentially increased in the wavelength region near the maximum absorption wavelength corresponding to the relative spectral sensitivity peak of the first element cell 125 over the standard measurement condition. Under the second element irradiation condition obtained by the battery 100 and preferentially increasing the radiant energy in the wavelength region near the maximum absorption wavelength corresponding to the peak of the relative spectral sensitivity of the second element cell 126 over the standard measurement condition, the short circuit current I2 Is obtained by each solar cell 100, and in the third element irradiation condition in which the radiant energy is preferentially increased in the wavelength region near the maximum absorption wavelength corresponding to the peak of the relative spectral sensitivity of the third element cell 127 over the standard measurement condition, You may obtain | require the short circuit current I3 with each solar cell 100. FIG.
That is, in the first element irradiation condition, among the maximum absorption wavelengths of the three element cells 125, 126, and 127, light having the largest radiation energy is irradiated at the maximum absorption wavelength of the first element cell 125. Then, among the maximum absorption wavelengths of the three element cells 125, 126, and 127, light having the largest radiation energy is irradiated at the maximum absorption wavelength of the second element cell 126. Under the third element irradiation condition, the three element cells 125 are irradiated. 126, 127 may be irradiated with light having the largest radiation energy at the maximum absorption wavelength of the third element cell 127.

  In the above-described embodiment, the radiant energy is limited using the limiting filter 6 when setting the second element irradiation condition. However, the present invention is not limited to this, and also when setting the other element irradiation conditions. The radiant energy may be limited using the limiting filter 6.

  In the above-described embodiment, the radiant energy is limited using the limiting filter 6 when setting the second element irradiation condition, but the present invention is not limited to this, and the second element is adjusted by adjusting the light source device 2. Irradiation conditions may be used.

In the above-described embodiment, the case of the solar battery 100 including the three element cells 125, 126, and 127 has been described. However, the present invention is not limited to this, and the sun including four or more element cells. The above-described sorting method can be applied even to a battery.
In the case of a solar cell including four or more element cells, the selection may be performed under the element irradiation conditions according to the three element cells as in the above embodiment, or the same number of elements as the number of element cells. You may sort according to irradiation conditions.

  In the above-described embodiment, one reference solar cell is selected from one group of solar cells, but the present invention is not limited to this, and a plurality of reference solar cells may be selected.

  In the above-described embodiment, the sorting device 1 and the solar simulator (light generation device) are separate bodies, but the present invention is not limited to this, and the sorting device 1 may be used as a solar simulator.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

  Specific reference examples of the present invention and the reference solar cell selection procedure of the comparative example and the evaluation results thereof will be described.

Example 1
In the sorting method according to the first embodiment, first, 50 solar cells 100 including the first element cell 125, the second element cell 126, and the third element cell 127 are prepared, and 15 solar cells 100 are extracted therefrom. did.
In a separate process, the relative spectral sensitivity of each of the element cells 125, 126, and 127 was measured for the solar cell 100, and the maximum absorption wavelength that took the maximum relative spectral sensitivity of each of the element cells 125, 126, and 127 was calculated. The maximum absorption wavelengths of the element cells 125, 126, and 127 were 460 nm, 650 nm, and 800 nm, respectively, as can be seen from FIG.

Subsequently, each of the extracted 15 solar cells 100 is irradiated with light under the following four conditions (a) to (d) to measure current-voltage characteristics, and the short-circuit current under each condition is measured. Calculated.
(A) Standard measurement conditions (air mass 1.5, 1000 W / m ² , 25 ° C., wavelength 460 nm, wavelength 650 nm, and radiation energy at wavelength 800 nm are X joule, Y joule, and Z joule, respectively)
(B) First element irradiation condition (radiant energy at a wavelength of 460 nm is 0.8 X Joule)
(C) Second element irradiation condition (radiant energy at a wavelength of 650 nm is 0.8 YJ)
(D) Third element irradiation condition (radiant energy at a wavelength of 800 nm is 0.8 Z joule)

Then, each of the short-circuit current I1 under the first element irradiation condition, the short-circuit current I2 under the second element irradiation condition, and the short-circuit current I3 under the third element irradiation condition is divided by the short-circuit current Isc under the standard measurement condition. The short-circuit current ratio (I1 / Isc) under the element irradiation conditions, the short-circuit current ratio (I2 / Isc) under the second element irradiation conditions, and the short-circuit current ratio (I3 / Isc) under the third element irradiation conditions were calculated and calculated. The product A was calculated by multiplying the short-circuit current ratio of the first element irradiation condition, the second element irradiation condition, and the third element irradiation condition.
The average value Ra of the product A of the short-circuit current ratios of the 15 solar cells 100 is calculated, and the average value Ra of the product of the short-circuit current ratios is compared with the product A of the short-circuit current ratios of the solar cells 100 to obtain the closest value. The solar cell 100 was selected as the reference solar cell 100a.

(Comparative Example 1)
The screening method of the reference solar cell of Comparative Example 1 was the same except that the measurement under the second element irradiation condition was not performed in the screening procedure of the reference solar cell of Example 1.
That is, the current-voltage characteristics are measured by irradiating light under standard measurement conditions, first element irradiation conditions, and third element irradiation conditions to each of the 15 solar cells 100 that are the same as in Example 1. The short circuit current under the conditions was calculated.
Then, the short-circuit current I1 under the first element irradiation condition and the short-circuit current I3 under the third element irradiation condition are respectively divided by the short-circuit current Isc under the standard measurement condition, and the short-circuit current ratio of the first element irradiation condition and the third element The short-circuit current ratio of the irradiation conditions was calculated, and the product was calculated by multiplying the calculated short-circuit current ratios of the first and third element irradiation conditions.

  Table 1 shows the sorting results of Example 1 and Comparative Example 1.

In Example 1, as indicated by bold letters in Table 1, the average value R is 0.94, so the sample No. having the same value (0.94) is used. 1 and no. 2 becomes the reference solar cell 100a.
On the other hand, in Comparative Example 1, as shown in bold letters in Table 1, since the average value R is 0.98, the sample No. having the same value (0.98) is used. 5 becomes the reference solar cell 100a.

[Photoelectric conversion characteristics evaluation]
Using the reference solar cells selected in Example 1 and Comparative Example 1, the irradiance of the three solar simulators was adjusted, and the standard measurement conditions (air mass 1.5) were re-applied to the 15 solar cells 100 used for the selection. , 1000 W / m ² , 25 ° C.), and the deviation from the average output value under each standard measurement condition was calculated. The results are shown in Table 2.

  As shown in Table 2, when adjusted with the reference solar cell selected in Example 1, the error between each solar simulator was 0.2%, whereas the reference selected in Comparative Example 1 When adjusted with solar cells, the error between each solar simulator was 1%. From this, it was found that in Example 1, the solar simulator can be adjusted with higher accuracy than in Comparative Example 1.

DESCRIPTION OF SYMBOLS 1 Sorting device 2 Light source device 6 Limit filter 100 Solar cell 100a Reference solar cell 125 First element cell 126 Second element cell 127 Third element cell I1, I2, I3, Isc Short circuit current J1 First short circuit current ratio J2 Second short circuit Current ratio J3 Third short-circuit current ratio A Short-circuit current ratio product Ra Short-circuit current ratio product average B Short-circuit current product Rb Short-circuit current product average

Claims (8)

In a reference solar cell sorting device for sorting a reference solar cell from a plurality of solar cells,
Each of the plurality of solar cells has at least three element cells having different maximum absorption wavelengths corresponding to the maximum relative spectral sensitivity,
The three element cells are composed of a first element cell, a second element cell, and a third element cell.
Having a light irradiation device for irradiating light to the solar cell;
The light irradiation device can irradiate light at least under any of the following conditions (1) to (4),
Each solar cell is irradiated with light under one condition selected from the following (1) to (4),
In each solar cell, the first short-circuit current ratio as the short-circuit current ratio under the following first element irradiation condition and the following second element irradiation condition with respect to the short-circuit current under reference irradiation conditions for irradiating light with a predetermined irradiance A second short-circuit current ratio, which is a short-circuit current ratio, and a third short-circuit current ratio, which is a short-circuit current ratio under the following third element irradiation conditions, are calculated, and the calculated first short-circuit current ratio, second short-circuit current ratio, and third short-circuit current are calculated. Calculate the product of the short-circuit current ratio multiplied by the ratio,
The product of the short-circuit current ratio of the plurality of solar cells and the product of the short-circuit current ratio of each solar cell are compared, and a solar cell having a product of the short-circuit current ratio closest to the average value is used as a reference solar cell. A reference solar cell sorting apparatus characterized by sorting.
(1) A first element irradiation condition for irradiating light having a smaller radiation energy at the maximum absorption wavelength of the first element cell than the reference irradiation condition, and a radiant energy at the maximum absorption wavelength of the second element cell than the reference irradiation condition. A second element irradiation condition for irradiating light with a small value, and a third element irradiation condition for irradiating light having a smaller radiation energy at the maximum absorption wavelength of the third element cell than the reference irradiation condition.
(2) a first element irradiation condition for irradiating light having a larger radiation energy at the maximum absorption wavelength of the first element cell than the reference irradiation condition; and a radiation energy at the maximum absorption wavelength of the second element cell than the reference irradiation condition. A second element irradiation condition for irradiating light with a large current, and a third element irradiation condition for irradiating light having a larger radiation energy at the maximum absorption wavelength of the third element cell than the reference irradiation condition.
(3) Of the maximum absorption wavelengths of the three element cells, the first element irradiation condition for irradiating light with the smallest radiation energy at the maximum absorption wavelength of the first element cell and the maximum absorption wavelength of the second element cell A second element irradiation condition for irradiating light with low radiant energy and a third element irradiation condition for irradiating light with the lowest radiant energy at the maximum absorption wavelength of the third element cell.
(4) Among the maximum absorption wavelengths of the three element cells, the first element irradiation condition for irradiating light having the largest radiation energy at the maximum absorption wavelength of the first element cell and the maximum absorption wavelength of the second element cell A second element irradiation condition for irradiating light having a large radiation energy and a third element irradiation condition for irradiating light having the largest radiation energy at the maximum absorption wavelength of the third element cell. The solar cell is laminated in the order of the first element cell, the second element cell, the third element cell from the light irradiation side,
The light irradiation device has a light source and a limiting filter,
The limiting filter preferentially restricts the radiant energy at the maximum absorption wavelength of the second element cell,
2. The reference solar cell sorting apparatus according to claim 1, wherein, under the second element irradiation condition, the solar cell is irradiated with light through the limiting filter from a light source.   3. The reference solar cell sorting apparatus according to claim 2, wherein the limiting filter has a transmittance of 20% to 80% at the maximum absorption wavelength of the second element cell.   4. The reference solar cell according to claim 2, wherein the limiting filter has a transmittance at a maximum absorption wavelength of the second element cell smaller than a transmittance at a maximum absorption wavelength of the first element cell. 5. Sorting device.   When the relative spectral sensitivity with respect to each absorption wavelength is graphed for each of the first element cell, the second element cell, and the third element cell, the limiting filter includes the graph of the first element cell and the second element cell. 5. The radiant energy is preferentially reduced in a range from a wavelength corresponding to the intersection of the graphs to a wavelength corresponding to the intersection of the graphs of the second element cell and the third element cell. The reference solar cell sorting apparatus according to claim 1.   6. The reference according to claim 1, wherein the reference irradiation condition is any one of a first element irradiation condition, a second element irradiation condition, a third element irradiation condition, and a standard measurement condition. Solar cell sorting device. In a reference solar cell selection method for selecting a reference solar cell from a plurality of solar cells,
Each of the plurality of solar cells has at least three element cells having different maximum absorption wavelengths corresponding to the maximum relative spectral sensitivity,
The three element cells are composed of a first element cell, a second element cell, and a third element cell.
Using a light irradiation device that irradiates light to the solar cell, each solar cell is irradiated with light under one condition selected from the following (5) to (8),
In each solar cell, the first short-circuit current ratio as the short-circuit current ratio under the following first element irradiation condition and the following second element irradiation condition with respect to the short-circuit current under reference irradiation conditions for irradiating light with a predetermined irradiance A second short-circuit current ratio, which is a short-circuit current ratio, and a third short-circuit current ratio, which is a short-circuit current ratio under the following third element irradiation conditions, are calculated, and the calculated first short-circuit current ratio, second short-circuit current ratio, and third short-circuit current are calculated. Calculate the product of the short-circuit current ratio multiplied by the ratio,
The product of the short-circuit current ratio of the plurality of solar cells and the product of the short-circuit current ratio of each solar cell are compared, and a solar cell having a product of the short-circuit current ratio closest to the average value is used as a reference solar cell. A method for sorting reference solar cells, comprising sorting.
(5) A first element irradiation condition for irradiating light having a smaller radiation energy at the maximum absorption wavelength of the first element cell than the reference irradiation condition, and a radiant energy at the maximum absorption wavelength of the second element cell than the reference irradiation condition. A second element irradiation condition for irradiating light with a small value, and a third element irradiation condition for irradiating light having a smaller radiation energy at the maximum absorption wavelength of the third element cell than the reference irradiation condition.
(6) A first element irradiation condition for irradiating light having a larger radiation energy at the maximum absorption wavelength of the first element cell than the reference irradiation condition, and a radiant energy at the maximum absorption wavelength of the second element cell than the reference irradiation condition. A second element irradiation condition for irradiating light with a large current, and a third element irradiation condition for irradiating light having a larger radiation energy at the maximum absorption wavelength of the third element cell than the reference irradiation condition.
(7) Of the maximum absorption wavelengths of the three element cells, the first element irradiation condition for irradiating light with the smallest radiant energy at the maximum absorption wavelength of the first element cell and the maximum absorption wavelength of the second element cell A second element irradiation condition for irradiating light with low radiant energy and a third element irradiation condition for irradiating light with the lowest radiant energy at the maximum absorption wavelength of the third element cell.
(8) Of the maximum absorption wavelengths of the three element cells, the first element irradiation condition for irradiating light having the largest radiation energy at the maximum absorption wavelength of the first element cell and the maximum absorption wavelength of the second element cell A second element irradiation condition for irradiating light having a large radiation energy and a third element irradiation condition for irradiating light having the largest radiation energy at the maximum absorption wavelength of the third element cell. A method of manufacturing a solar cell module using a reference solar cell selected by the method of selecting a reference solar cell according to claim 7 and a light generator that generates light of a predetermined irradiance,
A solar cell forming step of forming a solar cell;
An illuminance adjustment step of adjusting the irradiance of light irradiated from the light generator using the reference solar cell;
The manufacturing method of the solar cell module characterized by including the evaluation process which irradiates the light which adjusted the irradiance by the said illumination intensity adjustment process to the said solar cell, and evaluates the photoelectric conversion characteristic of a solar cell.

Images