WO2012090359A1

WO2012090359A1 - Pseudo reference cell and pseudo reference cell system

Info

Publication number: WO2012090359A1
Application number: PCT/JP2011/005178
Authority: WO
Inventors: 宜弘西川
Original assignee: コニカミノルタセンシング株式会社
Priority date: 2010-12-28
Filing date: 2011-09-14
Publication date: 2012-07-05
Also published as: JPWO2012090359A1; JP5561378B2

Abstract

A pseudo reference cell (30) of the present invention is provided with a plurality of photovoltaic elements (13, 22) having combined spectral sensitivity set equal to the spectral sensitivity of a solar cell to be measured, said photovoltaic elements having different spectral sensitivity characteristics. A pseudo reference cell system of the present invention is provided with the pseudo reference cell. Consequently, the pseudo reference cell (30) has spectral sensitivity characteristics equivalent to spectral sensitivity which a reference cell for the solar cell to be measured desirably has, and is capable of maintaining a physically stable state for a relatively long period of time. The pseudo reference cell system is capable of computing a short-circuit current of the pseudo reference cell (30).

Description

Pseudo reference cell and pseudo reference cell system

The present invention relates to a pseudo reference cell (pseudo reference cell) for evaluating solar cells.
cell) and a pseudo reference cell system using the pseudo reference cell.

In recent years, solar cells have become widespread and are intensely competing between manufacturers or products. In addition, many types of compositions such as single crystal silicon, amorphous silicon, thin film silicon, and organic compounds have been developed.

Since such a solar cell has an inherent spectral sensitivity characteristic due to the material and structure, its photoelectric conversion characteristic greatly depends on the spectral irradiance of irradiation light for performance evaluation. Therefore, in order to fairly evaluate the photoelectric conversion efficiency of these solar cells, IEC60904 (IEC; International Electrotechnical Commission; International Electrotechnical Commission) and JISC 8905 to C8991 (JIS; Japanese Industrial Standards) Defined in For solar cell performance measurement, a solar simulator having a spectral irradiance L (λ) approximated to the spectral irradiance (= S (λ)) of the reference sunlight under the internationally agreed standard test conditions Often used indoors.

This solar simulator has machine differences between manufacturers and between the same manufacturers. For this reason, even if it is a solar cell with the same spectral sensitivity characteristic, if a solar cell is measured with a different solar simulator, the electric power generation amount of a solar cell will differ.

Therefore, the measurer, for example, sends a solar cell as a sample to the National Institute of Advanced Industrial Science and Technology (= a national or similar organization that has an internationally standardized reference solar spectrum in Japan). And request the measurement. Accordingly, these institutions obtain the short-circuit current Isc in the natural sunlight AM1.5, 100 mW / cm ² of the sample using a high approximate solar simulator that is close to the reference sunlight as long as it is owned, and the measured value (= A) is described and returned to the measurer who is the client.

In response to this, the measurer uses the returned sample as the company's reference cell for adjusting the light quantity of the solar simulator. That is, the measurer irradiates the reference cell with the irradiation light of the solar simulator, and adjusts the amount of light of the solar simulator so that the short-circuit current Isc becomes the measurement value A. Then, the measurer measures the characteristics of the solar cell (of the product to be inspected) to be actually measured. As described above, it is difficult to accurately reproduce the spectrum of the reference sunlight, but this is a technique for adjusting the solar simulators of each company as much as possible.

Incidentally, since the characteristics of the silicon crystal solar cell are relatively stable, a reference cell capable of maintaining a stable state for a long time can be easily obtained. On the other hand, in the case of a thin-film silicon-based solar cell, a stable state cannot be maintained for a long time due to changes in physical properties such as light degradation and heat recovery. There is also the influence of light soaking of the solar cell itself. For this reason, a reference cell made of a thin film silicon solar cell lacks stability of the calibration value, and reproducibility of the light amount adjustment result of the solar simulator is poor.

In JIS C8933 and the like, in the case of a thin-film silicon-based solar cell, a pseudo-reference cell in which an optical filter is pasted on a silicon crystal-based cell with stable characteristics in order to overcome such instability of the reference cell. To adjust the amount of solar simulator light.

Therefore, a proposal has been made to select a pseudo cell using amorphous silicon as the above-described thin-film silicon-based reference cell (see Patent Document 1). In this pseudo cell, the film thickness of the amorphous silicon layer is changed to match the relative spectral sensitivity characteristic with that of the solar cell to be measured.

However, the pseudo cell disclosed in Patent Document 1 cannot obtain a stable pseudo cell sufficient for calibration as a reference because the amorphous silicon layer itself is physically unstable. On the other hand, since the spectral sensitivity of silicon is insensitive in the wavelength range longer than 1100 nm, it has a sensitivity of 1100 nm or more such as a thin film solar cell made of CIS (CuInSe ₂ ) or CIGS (Cu (In, Ga) Se ₂ ). A pseudo cell cannot be created.

JP 2006-147755 A

The present invention has been made in view of the above-described circumstances, and its purpose is to maintain a stable state for a relatively long period of time with a spectral sensitivity characteristic equivalent to that of a solar cell to be measured. It is an object of the present invention to provide a pseudo cell that can be obtained, a pseudo reference cell that is a reference cell, and a pseudo reference cell system that can determine a short-circuit current using the pseudo cell.

The pseudo reference cell and the pseudo reference cell system according to the present invention include a plurality of photovoltaic elements having different spectral sensitivity characteristics, wherein the combined spectral sensitivity is set to be equal to the spectral sensitivity of the solar cell to be measured. ing. For this reason, the pseudo reference cell according to the present invention has a spectral sensitivity characteristic equivalent to a spectral sensitivity desired as a reference cell of a solar cell to be measured, and can maintain a physically stable state for a relatively long period of time. The pseudo reference cell system can determine the short circuit current of the pseudo reference cell.

The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

It is a block diagram which shows the structure of the pseudo reference cell system concerning embodiment. It is a figure for demonstrating the pseudo reference cell which is a component of the pseudo reference cell system shown in FIG. It is a figure which shows the spectral sensitivity of a CIS type solar cell and a crystalline Si type solar cell. It is a figure which shows the spectral sensitivity of the CIS type solar cell, the pseudo reference cell, the Si element, the InGaAs element, and the spectral transmittance of the optical filter. It is a figure which shows the spectral sensitivity of a pseudo reference cell and a CIS solar cell. It is a flowchart for demonstrating the short circuit current calculation process by this embodiment. It is a flowchart for demonstrating light quantity adjustment of the solar simulator by a normal reference | standard cell.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted suitably. Further, in this specification, when referring generically, it is indicated by a reference symbol without a suffix, and when referring to an individual configuration, it is indicated by a reference symbol with a suffix.

<Embodiment>
Normally, in the light amount adjustment of the solar simulator, IV (current-voltage) measurement of a reference cell (including a pseudo cell) is performed, but in the pseudo reference cell system according to the present embodiment, only a short-circuit current is measured. . That is, when adjusting the amount of light of the solar simulator, the adjustment is made only with the short-circuit current, so only the short-circuit current needs to be known, and this pseudo reference cell system is specialized in the short-circuit current measurement function.

In this pseudo reference cell system, a pseudo reference cell that covers the spectral sensitivity wavelength range of the solar cell to be measured and can maintain a physically stable state for a long period of time is used.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a pseudo reference cell system 100 according to the embodiment, and FIG. 2 is a diagram for explaining a pseudo reference cell 30 constituting the pseudo reference cell system 100 shown in FIG. .

First, the pseudo reference cell 30 shown in FIG. 2 will be described. 2A is a front view of the pseudo reference cell 30, that is, a diagram showing a surface that receives pseudo sunlight, and FIG. 2B is a cross-sectional view of the pseudo reference cell 30, that is, its structure. FIG.

The pseudo reference cell 30 includes a plurality of photovoltaic elements. The pseudo reference cell 30 of the present embodiment is configured by, for example, two solar cells (light receiving sensors) of the first light receiving unit 10 and the second light receiving unit 20.

The first light receiving unit 10 includes a cover glass 11, an optical filter 12, and an InGaAs (indium gallium arsenide) element 13. The InGaAs element 13 converts light energy into electric energy by the photovoltaic effect and outputs the light energy. It is an example of the photovoltaic element which performs. The cover glass 11, the optical filter 12, and the InGaAs element 13 are laminated in this order from the light receiving surface side.

The second light receiving unit 20 includes a cover glass 21 and an Si element 22, and the Si element 22 is another example of the photovoltaic element. The cover glass 21 and the Si element 22 are laminated in this order from the light receiving surface side. The spectral sensitivity characteristic of the InGaAs element 13 and the spectral sensitivity characteristic of the Si element 22 are different from each other, as will be described later.

When each of the first light receiving unit 10 and the second light receiving unit 20 receives simulated sunlight from the solar simulator 1, the first light receiving unit 10 and the second light receiving unit 20 photoelectrically convert the photovoltaic effect and output a voltage by IV conversion.

Further, the pseudo reference cell 30 is a pseudo standard cell of a solar cell using CIS, that is, a cell having a spectral sensitivity substantially equal to a spectral sensitivity desired for a standard cell of a CIS solar cell to be measured.

As shown in FIG. 2 (B), the first light receiving unit 10 is a light receiving element in which an optical filter 12 is pasted on an InGaAs element 13 in a housing and the top is covered with a cover glass 11 for protection. is there. This optical filter 12 is for making the spectral sensitivity characteristic of the 1st light-receiving part 10 into desired spectral sensitivity. The optical filter 12 only needs to be a filter that can transmit a desired wavelength (for example, a bandpass filter, a cutoff filter, or the like), and is, for example, an absorption optical filter or an interference optical filter.

On the other hand, the second light receiving unit 20 is a light receiving element in which a Si (silicon) element 22 is covered with a cover glass 21 for protection.

CIS solar cells absorb light energy for a wider range of wavelengths than crystalline Si solar cells.

FIG. 3 is a diagram showing the spectral sensitivity of a solar cell using CIS (CIS solar cell) and the spectral sensitivity of a solar cell using crystalline Si (crystalline Si solar cell). As shown in FIG. 3, the spectral sensitivity (dashed line) of the CIS type solar cell has a sensitivity from about 300 nm to about 1300 nm, while the spectral sensitivity (dashed line) of the crystalline Si type solar cell is about 300 nm to about 1300 nm. The sensitivity is only up to about 1200 nm. Therefore, in the pseudo cell using the crystalline Si type solar cell, the spectral sensitivity of the CIS type solar cell cannot be created no matter what optical filter is used.

Therefore, in the pseudo reference cell 30 of the present embodiment, the wavelength range of the spectral sensitivity is expanded by adding another light receiving element having sensitivity even with respect to the wavelength at which the crystalline Si is not sensitive.

Here, the spectral sensitivity of the Si element 22 is P1 (λ), the spectral sensitivity of the InGaAs element 13 is P2 (λ), and the weighting coefficient (loading coefficient) of the Si element 22 is K1 (λ) (for example, 92. 4%), and the spectral transmittance P (λ) of the pseudo reference cell 30 can be obtained using the following equation (1).
P (λ) = K1 (λ) * P1 (λ) + K2 (λ) * P2 (λ) (1)

The weighting coefficient K1 is a design value for adjusting to the desired combined spectral sensitivity. In this embodiment, the weighting coefficient K1 is the same value for all wavelengths, but is changed for each wavelength. May be.

In the present embodiment, for simplicity of explanation, the spectral transmittance K2 of the optical filter 12 is the InGaAs element 13 in the wavelength band in which the Si element 22 has no sensitivity among the wavelengths in which the CIS solar cell has sensitivity. Is set to perform photoelectric conversion.

FIG. 4 shows the spectral sensitivity CIS (solid line) of the CIS solar cell, the spectral sensitivity P (λ) of the pseudo reference cell 30 (short dashed line;...), The spectral sensitivity P1 (λ) of the Si element 22 (dashed line). FIG. 4 is a diagram showing the spectral sensitivity P2 (λ) (two-dot chain line) of the InGaAs element 13 and the spectral transmittance K2 (λ) (long broken line; ————) of the optical filter 12.

CIS type solar cells have sensitivity in the wavelength range of about 300 nm to about 1350 nm (see CIS). On the other hand, the Si element 22 of the pseudo reference cell 30 has sensitivity in a wavelength range of about 300 nm to about 1200 nm (see P1) and does not have sensitivity in a wavelength range of about 1200 nm to about 1350 nm. Therefore, the wavelength range of about 1200 nm to about 1350 nm is supplemented by the InGaAs element 13 having sensitivity in this range. The InGaAs element 13 has sensitivity in the wavelength range of about 780 nm to about 1700 nm (see P2). In view of this, the InGaAs element 13 compensates for the sensitivity in the range necessary for the pseudo reference cell 30, that is, in the wavelength range of about 1200 nm to about 1350 nm, and considers the spectral sensitivity of the crystalline Si type solar cell 22, and has a wavelength of about 950 nm to about 950 nm. An optical filter 12 that transmits light in the range of 1350 nm is used (see K2).

When the spectral sensitivity P1 (λ) of the Si element 22 and the spectral sensitivity P2 (λ) of the InGaAs element 13 filtered by the optical filter 12 having the spectral transmittance K2 (λ) are combined, this combined spectral sensitivity is pseudo-referenced. The spectral sensitivity P (λ) of the cell 30 is obtained.

FIG. 5 is a diagram showing the spectral sensitivity P (λ) of the pseudo reference cell 30 and the spectral sensitivity CIS of the standard cell of the solar cell using CIS. That is, the pseudo reference cell 30 has a spectral sensitivity (dashed line) substantially equal to the spectral sensitivity (dashed line) desired as a standard cell of a solar cell using the CIS that is a solar cell to be measured. Become.

Here, if the spectrum mismatch error of the pseudo reference cell 30 is, for example, −0.4%, the JIS requirement ± 1% or less is satisfied, so there is a practical problem in adjusting the solar simulator 1. There will be no.

Spectral mismatch error MM is defined as Eref (λ) as the spectral irradiance of the reference solar light, Emes (λ) as the spectral irradiance of the solar simulator used for measuring the solar cell, When the desired spectral sensitivity is Sref (λ) and the spectral sensitivity of the pseudo reference cell 30 is P (λ), the following equation (2) is obtained. In FIG. 5, CIS corresponds to Sref (λ).
MM = (∫Eref (λ) * Sref (λ) dλ * ∫Emes (λ) * P (λ) dλ) / (∫Emes (λ) * Sref (λ) dλ * ∫Eref (λ) * P (λ Dλ) (2)

Thus, by using the InGaAs element 13 and the optical filter 12 in addition to the Si element 22, the pseudo reference cell 30 having a spectral sensitivity close to that of the CIS solar cell can be created.

In addition, the said Formula (1) is a type | formula which calculates | requires the spectral sensitivity of the pseudo reference cell 30 of embodiment, You may use three or more photovoltaic elements, In that case, the spectral sensitivity P ( λ) is obtained by the following equation (3) when the spectral sensitivity of each photovoltaic element is Pi (λ) and the spectral transmittance of the optical filter attached to each photovoltaic element is Ki (λ). It is done.
P (λ) = ΣKi (λ) * Pi (λ) (3)
However, Σ is the sum of i. By using this equation (3), the combined spectral sensitivity characteristic when a plurality of photovoltaic elements are used is obtained.

In the embodiment, the pseudo reference cell 30 is configured by combining the second light receiving unit 20 including the Si element 22 and the first light receiving unit 10 including the optical filter 12 and the InGaAs element 13. For example, a plurality of light receiving parts not using an optical filter may be used, or a plurality of light receiving parts using an optical filter may be used. In addition to the InGaAs element, other photovoltaic elements may be used. For example, a photovoltaic element using Ge (germanium), a thermopile, or the like may be used.

Next, the pseudo reference cell system 100 will be described with reference to FIG. The pseudo reference cell system 100 includes a pseudo reference cell 30, an A / D conversion unit 40, a calculation control unit 50, a calibration value storage unit 60, a communication unit 70, a display unit 80, and an integrating sphere 90. .

The pseudo reference cell 30 is, for example, a pseudo reference cell illustrated in FIG. 2 and includes a first light receiving unit 10 and a second light receiving unit 20. For convenience of explanation, it is described that only a part of the light receiving surface is in contact with the integrating sphere 90, but in actuality, it is installed at an appropriate position according to the integrating sphere 90, and the entire surface of the light receiving surface of the pseudo reference cell 30. It faces the integrating sphere 90.

The calibration value storage unit 60 is a memory that stores in advance calibration values for correcting variations in sensitivity of the first light receiving unit 10 and the second light receiving unit 20.

The integrating sphere 90 plays a role of guiding light of the same amount to each sensor by spatially mixing the light introduced from the solar simulator 1 by the diffuse reflection surface in the sphere.

The pseudo reference cell 30 includes a plurality of light receiving elements, and in the example illustrated in FIGS. 1 and 2, the first light receiving unit 10 and the second light receiving unit 20 that are arranged in parallel with each other. When light is received from the solar simulator 1, the parts of the solar simulator 1 that are measured by the respective light receiving units are different, and are affected by the spatial non-uniformity of the light quantity of the solar simulator. For this reason, by receiving the pseudo sunlight through the integrating sphere 90 by each light receiving unit, the amount of light of the solar simulator 1 measured by each solar cell becomes uniform, and the dependence of the arrangement position is eliminated. Is possible. Therefore, the pseudo reference cell system 100 having such a configuration can perform measurement with higher accuracy.

The A / D conversion unit 40 amplifies each voltage output from the first light receiving unit 10 and the second light receiving unit 20 and converts each analog value into each digital value.

The calculation control unit 50 includes the values of the voltages output from the A / D conversion unit 40 and the calibration values of the first light receiving unit 10 and the second light receiving unit 20 stored in advance in the calibration value storage unit 60. From this, the short circuit current Isc of the pseudo reference cell 30 is calculated.

The voltage value of the first light receiving unit 10 output from the A / D conversion unit 40 is A1, the voltage value of the second light receiving unit 20 is A2, the calibration value of the first light receiving unit 10 is C1, and the second When the calibration value of the light receiving unit 20 is C2, the short circuit current Isc is obtained by using the following equation (4).
Isc = C1 * A1 + C2 * A2 (4)
The calibration value C1 is a calibration value for the first light receiving unit 10 including the calibration value of the optical filter 12.

The communication unit 70 is an interface for outputting predetermined data to a device outside the pseudo reference cell system 100. For example, the communication unit 70 is a USB (Universal Serial Bus) interface or the like.

The display unit 80 is a display device or the like for displaying the short-circuit current Isc calculated by the calculation control unit 50.

The pseudo reference cell system 100 having such a configuration can be configured using, for example, a computer such as a personal computer, and the arithmetic control unit 50 described above can be installed in the computer by executing software in which a method of calculating a short-circuit current is executed. Functionally configured. In addition to the calculation control unit 50, one or more of the A / D conversion unit 40, the calibration value storage unit 60, the communication unit 70, and the display unit 80 illustrated in FIG. 1 may be configured by the computer.

Next, the operation of the pseudo reference cell system 100 will be described with reference to FIG. FIG. 6 is a flowchart for explaining a process in which the pseudo reference cell system 100 calculates the short circuit current Isc of the pseudo reference cell 30. FIG. 7 is a flowchart for explaining the light amount adjustment of the solar simulator by a normal reference cell.

Normally, when adjusting the solar simulator 1 using the reference cell, the user irradiates the reference cell 2 with simulated sunlight from the solar simulator 1 as shown in FIG. 7 (S1, S2), and the reference cell 2 is short-circuited. The current is measured by the current voltmeter 4 (S3). And the light quantity of the solar simulator 1 is adjusted so that the measured short circuit current may become the same as the short circuit current measured by public institutions, such as National Institute of Advanced Industrial Science and Technology.

On the other hand, in this embodiment, the user irradiates the simulated reference cell system 100 with simulated sunlight from the solar simulator 1, and the simulated reference cell system 100 calculates the short-circuit current and displays it on the display unit 80. Then, the light quantity of the solar simulator 1 is adjusted so that the displayed short-circuit current Isc is the same as the short-circuit current measured by the public engine.

More specifically, as shown in FIG. 1, the pseudo reference cell system 100 is set to receive the irradiation light of the solar simulator 1, and the solar simulator 1 is turned on to start illumination.

The first light receiving unit 10 and the second light receiving unit 20 that have received irradiation light from the solar simulator 1 via the integrating sphere 90 perform photoelectric conversion, respectively, and output voltages. Each of these output voltages is amplified by the A / D conversion unit 40, and each value A1, A2 of each voltage is obtained (step S10). The values A1 and A2 of these voltages are output to the arithmetic control unit 50.

The arithmetic control unit 50 reads out the calibration values C1 and C2 from the calibration value storage unit 60 (step S11), and from the values A1 and A2 of the voltages input from the A / D conversion unit 40, the equation (4) Is used to calculate the short-circuit current Isc (step S12).

The calculation control unit 50 transmits the calculated short-circuit current Isc to the display unit 80 and displays it on the display unit 80 (step S13).

In the present embodiment, the pseudo reference cell 30 has the first light receiving unit 10 and the second light receiving unit 20 arranged side by side, but the light receiving element of the first light receiving unit 10 and the light receiving element of the second light receiving unit 20 May be used as a pseudo reference cell. In this case, the integrating sphere 90 may be omitted.

Further, although the method of making the light uniform with the integrating sphere 90 has been described, the light may be received by the semicircular dome-shaped diffused light receiving sphere and guided to the light receiving portion of the pseudo reference cell.

This specification discloses various modes of technology as described above, and the main technologies are summarized below.

A pseudo reference cell according to an aspect includes a plurality of light receiving units each having a photovoltaic element that converts light energy into electrical energy by a photovoltaic effect and outputs the energy, and having different spectral sensitivity characteristics. The combined spectral sensitivity obtained by combining the outputs of the power elements is set to be equal to the (relative) spectral sensitivity of the solar cell to be measured.

According to such a configuration, it is possible to realize a desired spectral sensitivity by combining photovoltaic elements having different spectral sensitivities. Therefore, in a pseudo reference cell having a spectral sensitivity substantially equal to the spectral sensitivity of the solar cell to be measured. Thus, it is possible to provide a relatively stable pseudo reference cell. Here, the pseudo reference cell refers to a pseudo reference cell and a multi-junction type pseudo reference element cell.

In another aspect, in the above-described pseudo reference cell, a wavelength sensitivity region of another photovoltaic element exists outside the wavelength sensitivity region of the one of the plurality of photovoltaic elements. However, the wavelength sensitivity regions which are the respective spectral sensitivity characteristics overlap at least partially.

According to such a configuration, since the predetermined wavelength range includes different photovoltaic elements, by combining a plurality of photovoltaic elements, a pseudo reference cell having sensitivity to the desired wavelength range as a reference cell can be obtained. It becomes possible to provide.

In another aspect, in the above-described pseudo reference cell, one or a plurality of light receiving units (photovoltaic elements) of the plurality of light receiving units (photovoltaic elements) may include the combined spectral sensitivity. An optical filter that transmits only the wavelength range corresponding to the spectral sensitivity of the photovoltaic element is provided on the light receiving surface side of the photovoltaic element. In the above-described pseudo reference cell, preferably, the optical filter is an absorption optical filter. Alternatively, in the above-described pseudo reference cell, preferably, the optical filter is an interference optical filter.

According to such a configuration, since the optical filter is provided on the light receiving surface side of the photovoltaic element, it is possible to use the spectral sensitivity in a desired wavelength range among the spectral sensitivities of the photovoltaic element.

Moreover, the pseudo reference cell system according to another aspect calculates a short-circuit current of the pseudo reference cell by using any one of the pseudo reference cells described above and the current output from each of the plurality of photovoltaic elements. And an arithmetic unit.

According to the pseudo reference cell system having such a configuration, for example, a short circuit current for adjusting a solar simulator can be obtained using a pseudo reference cell having a spectral sensitivity substantially equal to a desired spectral sensitivity as a reference cell. It becomes possible.

In another aspect, in the above-described pseudo reference cell system, the pseudo reference cell system further includes a storage unit that stores a calibration constant for correcting the spectral sensitivity of each of the plurality of photovoltaic elements, and the calculation unit includes: The short circuit current of the pseudo reference cell is calculated using the current output from each of the plurality of photovoltaic elements and the calibration constant stored in the storage unit.

According to such a configuration, the output current can be calibrated for each photovoltaic element, so that a more accurate short-circuit current can be obtained.

In another aspect, the above-described pseudo reference cell system further includes a display unit that displays the short circuit current of the pseudo reference cell calculated by the arithmetic unit.

According to such a configuration, since the obtained short circuit current can be displayed on a display or the like, the user can easily know the short circuit current of the pseudo reference cell.

In another aspect, the above-described pseudo reference cell system further includes an output unit that outputs the short circuit current of the pseudo reference cell calculated by the arithmetic unit to the outside of the pseudo reference cell system.

According to such a configuration, since the obtained short-circuit current can be output to another device, other processing, for example, light amount adjustment of the solar simulator 1 is automatically performed based on the short-circuit current of the pseudo reference cell. Is possible.

In another aspect, in the above-described pseudo reference cell system, the pseudo reference cell receives irradiation light via an integrating sphere.

According to such a configuration, each photovoltaic element is irradiated with pseudo-sunlight having the same illuminance, so that it is possible to obtain a short-circuit current that does not depend on the arrangement position of each photovoltaic element.

This application is based on Japanese Patent Application No. 2010-291759 filed on Dec. 28, 2010, the contents of which are included in this application.

In order to express the present invention, the present invention has been properly and fully described through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. It is interpreted that it is included in

According to the present invention, a pseudo reference cell for evaluating a solar cell and a pseudo reference cell system using the pseudo reference cell can be provided.

Claims

The light energy is converted into electric energy by the photovoltaic effect and output, and includes a plurality of light receiving units having photovoltaic elements having different spectral sensitivity characteristics,
Each of the spectral sensitivities of the plurality of light receiving units is set so that a combined spectral sensitivity obtained by combining them is equal to a spectral sensitivity of a solar cell to be measured.
Among the plurality of photovoltaic elements, there is a wavelength sensitivity area of another photovoltaic element outside the wavelength sensitivity area of one photovoltaic element, and at least one wavelength sensitivity area as each spectral sensitivity characteristic is present. The pseudo reference cell according to claim 1, wherein the pseudo reference cells overlap each other.
One or more light receiving units of the plurality of light receiving units receive an optical filter that transmits only a wavelength range corresponding to a spectral sensitivity of the photovoltaic element among the combined spectral sensitivities. The pseudo reference cell according to claim 1, wherein the pseudo reference cell is provided on a surface side.
The pseudo reference cell according to claim 3, wherein the optical filter is an absorption optical filter.
The pseudo reference cell according to claim 3, wherein the optical filter is an interference optical filter.
A pseudo reference cell according to claim 1;
A pseudo reference cell system comprising: an arithmetic unit that calculates a short-circuit current of the pseudo reference cell using currents output from the plurality of photovoltaic elements.
A storage unit storing a calibration constant for correcting the spectral sensitivity of each of the plurality of photovoltaic elements;
The arithmetic unit calculates a short-circuit current of the pseudo reference cell using currents output from the plurality of photovoltaic elements and calibration constants stored in the storage unit. 7. The pseudo reference cell system according to 6.
The pseudo reference cell system according to claim 6, further comprising a display unit that displays a short circuit current of the pseudo reference cell calculated by the arithmetic unit.
The pseudo reference cell system according to claim 6, further comprising an output unit that outputs the short circuit current of the pseudo reference cell calculated by the arithmetic unit to the outside of the pseudo reference cell system.
The pseudo reference cell system according to claim 6, wherein the pseudo reference cell receives irradiation light through an integrating sphere.