KR100991986B1 - Solar cell - Google Patents

Abstract

A solar cell is disclosed. The first photoelectric conversion layer absorbs the incident sunlight and converts it into an electrical signal. The second photoelectric conversion layer is disposed at the front end of the first photoelectric conversion layer on the path of sunlight, and absorbs the incident sunlight to convert it into an electrical signal. The light collecting device is disposed between the first photoelectric conversion layer and the second photoelectric conversion layer on the path of the solar light, and focuses the sunlight so that the sunlight passing through the second photoelectric conversion layer is directed toward the first photoelectric conversion layer. According to the present invention, the photovoltaic layer disposed at the front of the condenser on the traveling path of the solar light absorbs sunlight having a short wavelength, and the photoelectric conversion layer disposed at the rear end absorbs the sunlight having a long wavelength, thereby generating heat. Is relaxed. In addition, it is possible to absorb the sunlight re-incident after scattering, it is possible to improve the efficiency, and less absorption of chromatic aberration because only a specific wavelength band is absorbed in each photoelectric conversion layer.

Solar cell, turndem, condenser, chromatic aberration

Description

Solar cell {Solar cell}

The present invention relates to a solar cell, and more particularly, to a light concentrating solar cell.

Recently, interest in renewable energy is increasing due to global environmental problems, depletion of fossil energy, waste disposal of nuclear power generation, and location selection due to the construction of new power plants. Among them, research on solar power generation as a pollution-free energy source Development is underway at home and abroad.

A solar cell is a semiconductor device that converts solar energy directly into electrical energy. The solar cell has a junction between a p-type semiconductor and an n-type semiconductor, and its basic structure is similar to that of a diode.

When solar light is irradiated to a solar cell having a structure in which p-type semiconductors and n-type semiconductors having different electrical properties are bonded to each other, electron-hole pairs are generated by light energy, and electrons and holes move. Therefore, electromotive force is generated by a photovoltaic effect in which current flows across the n-type semiconductor layer and the p-type semiconductor layer, and the current flows to a load connected to the outside.

Specifically, when light is incident on the solar cell from outside, the valence band electrons of the p-type semiconductor are excited to the conduction band by the incident light energy. The excited electrons generate one electron-hole pair inside the p-type semiconductor. The electrons in the electron-hole pair are transferred to the n-type semiconductor by an electric field existing between the p-n junctions to supply current to the outside.

1 is a view showing a schematic structure of a conventional focusing solar cell.

Referring to FIG. 1, the conventional light collecting solar cell 100 includes a photoelectric conversion layer 140 formed between two electrodes 120 and 130 and a light collecting device 110 that focuses sunlight. The sunlight is collected by the light collecting device 110 and is incident on the photoelectric conversion layer 140 as shown by an arrow denoted by reference numeral 150.

As described above, since the conventional solar cell 100 absorbs sunlight of all wavelengths in one photoelectric conversion layer 140, there is a problem in that the surface temperature is increased to decrease the efficiency of the solar cell. In the conventional light collecting solar cell 100, the photoconversion layer 140 absorbs only the sunlight vertically incident on the light collecting device 110 and converts the light into an electrical signal. You will not be able to absorb the sunlight that reenters. Since the solar light scattered by the atmosphere and re-incident is about 7%, there is a problem that the efficiency is inevitably deteriorated. In addition, the conventional condensing solar cell 100 focuses all of the sunlight from ultraviolet to infrared solar cells of a certain area, so that a large area of solar cells is required to prevent chromatic aberration, which is a price or There is a problem that adversely affects the efficiency.

The technical problem to be solved by the present invention is to provide a solar cell with improved heat efficiency and chromatic aberration, and absorbed scattered sunlight.

In order to solve the above technical problem, a solar cell according to the present invention includes a first photoelectric conversion layer for absorbing the incident sunlight and converts it into an electrical signal; A second photoelectric conversion layer disposed at a front end of the first photoelectric conversion layer on a path of sunlight to absorb incident sunlight and convert it into an electrical signal; And a solar cell configured to be disposed between the first photoelectric conversion layer and the second photoelectric conversion layer on a path of the solar light, and to condense the sunlight to pass through the second photoelectric conversion layer toward the first photoelectric conversion layer. A light collecting device.

According to the present invention, the photoelectric conversion layer disposed at the front end of the condenser on the path of sunlight absorbs sunlight having a short wavelength, and the long wavelength of the photoelectric conversion layer disposed at the rear end of the condenser on the path of sunlight. Having absorbs sunlight. Therefore, heat generation is alleviated as compared with the conventional condensing solar cell that focuses and absorbs sunlight having all wavelengths. Accordingly, the reliability of the solar cell can be improved, and the degradation of the efficiency of the open circuit voltage is alleviated.

In addition, the photoelectric conversion layer disposed at the front end of the condenser on the path of sunlight absorbs unfocused sunlight and thus absorbs sunlight incident at an arbitrary angle. Therefore, it is possible to absorb the sunlight that is reincident after scattering, thereby improving the efficiency. In addition, since only a specific wavelength band is absorbed in each photoelectric conversion layer, less chromatic aberration occurs. Therefore, the solar cell according to the present invention has a higher efficiency in the same area than the conventional condensing solar cell. In addition, since the light collecting device is mainly made of glass, polymer solar cells, dye-sensitized solar cells, and silicon solar cells can be easily implemented, and solar cells can be manufactured using relatively inexpensive Ge substrates.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a solar cell according to the present invention. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you.

2 is a view schematically showing the structure of a first preferred embodiment of a solar cell according to the present invention.

2, the solar cell 200 having the structure of the first embodiment includes a first lower electrode 220, a first photoelectric conversion layer 230, a first upper electrode 240, a light collecting device 210, The second lower electrode 250, the second photoelectric conversion layer 260, and the second upper electrode 270 are provided. The sunlight is sequentially incident on the second photoelectric conversion layer 260, the light collecting device 210, and the first photoelectric conversion layer 240, as indicated by arrows indicated by reference numeral 280.

The first lower electrode 220 is made of a conductive material such as gold (Au) and platinum (Pt).

The first photoelectric conversion layer 230 is formed on the first lower electrode 220 and absorbs the incident light into an electrical signal. The first photoelectric conversion layer 230 may include a plurality of cells that absorb incident light and convert the incident light into an electrical signal, and may be formed in a turndem structure. And the wavelength of the light absorbed by the cell disposed above (arranged in front of the path of sunlight travel) of the plurality of cells is shorter than the wavelength of light absorbed by the cell disposed below (located by the rear end of the path of sunlight travel). Each cell may be formed as much as possible. That is, light of a short wavelength is absorbed in a cell disposed at a position where sunlight is incident first, and a light of a relatively long wavelength is absorbed in a cell disposed below. An example of the photoelectric conversion layer 230 having such a turndem structure is illustrated in FIG. 3.

Referring to FIG. 3, the photoelectric conversion layer 230 includes a plurality of cells 310 and 370 and tunnel junction layers 320 and 360. The lower cell 310 has a form in which a p-GaAs layer 311, an n ⁺ -GaAs layer 312 and an n ⁺ -AlGaAs layer 313 are sequentially stacked. The upper cell 370 is formed by sequentially stacking the p-InGaP layer 371, the n ⁺ -InGaP layer 372, and the n ⁺ -AlInP layer 373. The tunnel junction layers 320 and 360 have a form in which n ⁺⁺ -GaAs layers 321 and 361 and p ⁺⁺ -GaAs layers 322 and 362 are sequentially stacked. The cells formed in the middle are formed slightly differently from the upper cell 370 and the lower cell 310 in order to lengthen the wavelength band of the absorbing light toward the lower part.

The first upper electrode 240 is formed on the first photoelectric conversion layer 230, and like the first lower electrode 220, is formed of a conductive material such as gold (Au) and platinum (Pt). An antireflective coating layer (not shown) may be formed on the first photoelectric conversion layer 230.

The light collecting device 210 is disposed above the first upper electrode 240 and focuses the light so that the incident light is directed toward the first photoelectric conversion layer 230. To this end, the light collecting device 210 may be provided with a light focusing means such as a lens.

The second lower electrode 250 is formed on the light collecting device 210 and is made of a conductive material. The second lower electrode 250 may be formed of a transparent conductive material such as indium tin oxide (ITO) in order to transmit sunlight well.

The second photoelectric conversion layer 260 is formed on the second lower electrode 250 and absorbs the incident light into an electrical signal. As indicated by the arrow 280, sunlight is first incident on the second photoelectric conversion layer 260, and light that is not absorbed by the second photoelectric conversion layer 260 is incident on the first photoelectric conversion layer 230. Accordingly, in order to alleviate heat generation of the solar cell 200, the second photoelectric conversion layer 260 absorbs sunlight having a short wavelength, and the first photoelectric conversion layer 230 has sunlight having a medium wavelength and a long wavelength. It is desirable to allow absorption. In general, in the case of a polymer solar cell or a dye-sensitized solar cell, a glass substrate is used, and the second photoelectric conversion layer 260 is a light concentrating device made of a transparent solid solid such as glass or polymethyl methcrylate (PMMA), which is easy to mold. Since it is formed on the 210, the second photoelectric conversion layer 260 may be easily formed.

The second photoelectric conversion layer 260 may have a plurality of cells that absorb the incident light and convert the incident light into an electrical signal like the first photoelectric conversion layer 230, and may have a turndem structure. And the wavelength of the light absorbed by the cell disposed above (arranged in front of the path of sunlight travel) of the plurality of cells is shorter than the wavelength of light absorbed by the cell disposed below (located by the rear end of the path of sunlight travel). Each cell may be formed as much as possible. That is, light of a short wavelength is absorbed in a cell disposed at a position where sunlight is incident first, and a light of a relatively long wavelength is absorbed in a cell disposed below. In this case, like the first photoelectric conversion layer 230, the second photoelectric conversion layer 260 may have a structure shown in FIG. 3.

The second upper electrode 270 is formed on the second photoelectric conversion layer 260 and is made of a conductive material. Like the second lower electrode 250, the second upper electrode 270 may be formed of a transparent conductive material such as ITO in order to transmit sunlight well. An antireflective coating layer (not shown) may be formed on the second photoelectric conversion layer 260.

As in the first embodiment, since the second photoelectric conversion layer 260 formed on the light collecting device 210 absorbs unfocused sunlight, the second photoelectric conversion layer 260 absorbs all the sunlight that is incident at an arbitrary angle. Therefore, since the sunlight which is scattered in the air and then re-incident is absorbed through the second photoelectric conversion layer 260, the efficiency can be improved.

In the second photoelectric conversion layer 260, only the sunlight having a relatively short wavelength is absorbed, and in the first photoelectric conversion layer 230, only the sunlight having a relatively long wavelength is absorbed. The heat generation at 230 is greatly alleviated. Conventional light-converging solar cells focus and absorb sunlight having all wavelengths, and thus the photoelectric conversion layer becomes a high temperature state. In the first embodiment, the first photoelectric conversion layer 230 has a short wavelength. Since the solar light is not focused, heat generation can be alleviated, thereby improving the reliability of the solar cell. In addition, since degradation of the open circuit voltage is alleviated, efficiency deterioration is also alleviated.

In general, it is impossible to remove chromatic aberration generated when solar light passes through the light collecting device. Therefore, in the conventional light-condensing solar cell, the condensed light can be obtained by increasing the area of the photoelectric conversion layer to exhibit a certain level or more efficiency. . However, in the case of the first embodiment, since the first photoelectric conversion layer 230 and the second photoelectric conversion layer 260 absorb only the sunlight of a specific wavelength band, less chromatic aberration occurs. Therefore, compared with the conventional condensing solar cell, even if the photoelectric conversion layer of the same area is formed, higher efficiency can be obtained. And since the light collecting device is mainly made of glass, polymer solar cells, dye-sensitized solar cells, and silicon solar cells can be easily implemented, and solar cells can be manufactured using relatively inexpensive Ge substrates.

4 is a view schematically showing the structure of a second preferred embodiment of a solar cell according to the present invention.

Referring to FIG. 4, the solar cell 400 having the structure of the second embodiment includes a first lower electrode 420, a first photoelectric conversion layer 430, a first upper electrode 425, a light collecting device 410, The second lower electrode 440, the second photoelectric conversion layer 450, the second upper electrode 445, the auxiliary condenser 415, the third lower electrode 460, the third photoelectric conversion layer 470, and the second Three upper electrodes 465 are provided. And the sunlight is the third photoelectric conversion layer 470, the auxiliary light collecting device 415, the second photoelectric conversion layer 450, the light collecting device 410 and the first photoelectric conversion layer 430 as shown by the arrow indicated by reference number 480 ) Are sequentially entered.

The first lower electrode 420, the first photoelectric conversion layer 430, the first upper electrode 425, the condenser 410, and the second lower electrode 440 provided in the solar cell having the structure of the second embodiment. The second photoelectric conversion layer 450 and the second upper electrode 445 may include the first lower electrode 220, the first photoelectric conversion layer 230, and the first upper portion of the solar cell 200 according to the first embodiment. The electrode 240, the light collecting device 210, the second lower electrode 250, the second photoelectric conversion layer 260, and the second upper electrode 270, respectively, correspond to each other.

The auxiliary light collecting device 415 is disposed above the second upper electrode 445 and focuses the light so that the incident light is directed toward the second photoelectric conversion layer 450. To this end, the auxiliary light collecting device 415 may be provided with a light focusing means such as a lens.

The third lower electrode 460 is formed on the auxiliary light collecting device 415 and is made of a conductive material. The third lower electrode 460 may be formed of a transparent conductive material such as ITO like the second upper electrode 445 and the second lower electrode 440 to transmit sunlight well.

The third photoelectric conversion layer 470 is formed on the third lower electrode 460 and absorbs the incident light into an electrical signal. As indicated by the arrow 480, sunlight is first incident on the third photoelectric conversion layer 470, and light that is not absorbed by the third photoelectric conversion layer 470 is incident on the second photoelectric conversion layer 450. Light that is not absorbed into the second photoelectric conversion layer 450 and the third photoelectric conversion layer 470 is incident on the first photoelectric conversion layer 430. Accordingly, in order to alleviate heat generation of the solar cell 400, the third photoelectric conversion layer 470 absorbs sunlight having a short wavelength, and the second photoelectric conversion layer 450 absorbs sunlight having a medium wavelength. In the first photoelectric conversion layer 430, it is preferable to allow sunlight having a long wavelength to be absorbed. Since the auxiliary condenser 415 is also generally made of glass, like the second photoelectric conversion layer 450, the third photoelectric conversion layer 470 may be easily formed on the auxiliary condenser 415. In this case, like the second photoelectric conversion layer 450, the third photoelectric conversion layer 470 may include a plurality of cells having different wavelength bands.

The third upper electrode 465 is formed on the third photoelectric conversion layer 470 and is made of a conductive material. Like the third lower electrode 460, the third upper electrode 465 may be formed of a transparent conductive material such as ITO in order to transmit sunlight well.

In the case of the second embodiment, compared with the first embodiment, one condenser 415 is further provided, and one photoelectric conversion layer 470 is further formed on the condenser 415. Therefore, the overall effect is similar to that of the solar cell 200 of the first embodiment described above, but one light concentrator 415 and one photoelectric conversion layer 470 are further provided, so that the heat generation relaxation, chromatic aberration relaxation effect, etc. It will appear bigger.

5 is a view schematically showing the structure of a third preferred embodiment of the solar cell according to the present invention.

Referring to FIG. 5, the solar cell 500 having the structure of the third embodiment includes a first upper electrode 540, a first photoelectric conversion layer 530, a first lower electrode 520, a light collecting device 510, The second lower electrode 550, the second photoelectric conversion layer 560, and the second upper electrode 570 are provided. The sunlight is sequentially incident on the second photoelectric conversion layer 560, the light collecting device 510, and the first photoelectric conversion layer 530, as indicated by arrows indicated by reference numeral 580.

The first upper electrode 540 is made of a conductive material such as gold (Au) and platinum (Pt). In the case of the third embodiment, since sunlight is incident from the lower side of the first photoelectric conversion layer 530 as indicated by the arrow 580, the electrode disposed at the front end as the upper electrode and the electrode disposed at the rear end are disposed on the traveling path of the sunlight. Is referred to as the lower electrode. In other words, the electrode under the first photoelectric conversion layer 530 is referred to as the upper electrode, and the electrode above the lower electrode is referred to as the lower electrode.

The first photoelectric conversion layer 530 is formed on the first upper electrode 540 and absorbs the incident light and converts the incident light into an electrical signal. Since the first photoelectric conversion layer 530 has a similar main role and configuration to the first photoelectric conversion layer 230 provided in the solar cell 200 of the first embodiment, the structure of the first photoelectric conversion layer 530 may be defined as follows. Corresponds to the first photoelectric conversion layer 230 provided in the solar cell 200 of the first embodiment.

The first lower electrode 520 is formed on the first photoelectric conversion layer 530 and, like the first upper electrode 540, is made of a conductive material such as gold (Au) or platinum (Pt). An antireflection coating layer (not shown) may be formed below the first photoelectric conversion layer 530.

The light concentrator 510 is disposed below the first upper electrode 540 and includes a reflector for focusing light so that incident light is reflected to the first photoelectric conversion layer 230.

The second lower electrode 550 is formed on a reflector provided in the light collecting apparatus 510 and is made of a conductive material. The second lower electrode 550 may be formed of a transparent conductive material such as ITO to transmit sunlight well.

The second photoelectric conversion layer 560 is formed on the second lower electrode 550, and absorbs the incident light into an electrical signal. The second photoelectric conversion layer 560 has a similar main role and configuration to the second photoelectric conversion layer 260 included in the solar cell 200 of the first embodiment.

The second upper electrode 570 is formed on the second photoelectric conversion layer 560 and is made of a conductive material. Like the second lower electrode 550, the second upper electrode 570 may be formed of a transparent conductive material such as ITO to transmit sunlight well. An antireflective coating layer (not shown) may be formed on the second photoelectric conversion layer 560.

In the solar cell 500 of the third embodiment, the light concentrating device 510 is disposed below the first photoelectric conversion layer 530, except that the focusing means of the solar light is not a lens but a reflector. Compared with the solar cell 200, the overall effect is similar to that of the solar cell 200 of the first embodiment. That is, since the unfocused sunlight is incident on the second photoelectric conversion layer 560, the sunlight that is re-incident after scattering in the atmosphere is incident to increase the efficiency of the solar cell 500. In addition, since the second photoelectric conversion layer 560 absorbs sunlight having a relatively short wavelength and the first photoelectric conversion layer 530 absorbs sunlight having a relatively long wavelength, deterioration and chromatic aberration are alleviated as described above. The effect of is implemented.

6 is a view schematically showing a structure of a fourth preferred embodiment of a solar cell according to the present invention.

Referring to FIG. 6, the solar cell 600 having the structure of the fourth embodiment includes the first lower electrode 620, the first photoelectric conversion layer 630, the first upper electrode 625, and the light collecting devices 610 and 615. ), Second lower electrodes 640 and 660, second photoelectric conversion layers 650 and 670, and second upper electrodes 645 and 665. The sunlight is sequentially incident on the second photoelectric conversion layers 650 and 670, the light collecting devices 610 and 615, and the first photoelectric conversion layer 630, as indicated by arrows indicated by reference numeral 680.

The first lower electrode 620, the first photoelectric conversion layer 630, and the first upper electrode 625 may include the first lower electrode 220 and the first photoelectric conversion layer provided in the solar cell 200 according to the first embodiment. Correspond to the first and second upper electrodes 230 and 240, respectively.

The light concentrators 610 and 615 are disposed above the first upper electrode 625 and reflect light to reflect the incident light in a path indicated by reference numeral 680 to the first photoelectric conversion layer 630. It is provided.

The second lower electrodes 640 and 660 are formed on reflecting plates provided in the light collecting apparatuses 610 and 615 and are made of a conductive material. The second lower electrodes 640 and 660 may be formed of a transparent conductive material such as ITO to transmit sunlight well.

The second photoelectric conversion layers 650 and 670 are formed on the second lower electrodes 640 and 660 and absorb the incident light to convert the incident light into electrical signals. Since the second photoelectric conversion layers 650 and 670 have a similar role and structure as those of the second photoelectric conversion layer 260 included in the solar cell 200 of the first embodiment, the second photoelectric conversion layers 650 and 670 are similar. The structure of corresponds to the first photoelectric conversion layer 260 provided in the solar cell 200 of the first embodiment.

The second upper electrodes 645 and 665 are formed on the second photoelectric conversion layers 650 and 670 and are made of a conductive material. Like the second lower electrodes 640 and 660, the second upper electrodes 645 and 665 may be formed of a transparent conductive material such as ITO in order to transmit sunlight well. An antireflective coating layer (not shown) may be formed on the second photoelectric conversion layers 650 and 670.

In the solar cell 600 of the fourth embodiment, the means for focusing the sunlight through the light collecting devices 610 and 615 is not a lens but a reflector, and only the arrangement of the light collecting devices 610 and 615 is different. Compared with the solar cell 200 of the first embodiment, the overall effect is similar to that of the solar cell 200 of the first embodiment. That is, since the unfocused sunlight is incident on the second photoelectric conversion layers 650 and 670, sunlight that is incident again after scattering in the atmosphere is incident to increase the efficiency of the solar cell 600. In addition, since the second photoelectric conversion layers 650 and 670 absorb sunlight having a relatively short wavelength, and the first photoelectric conversion layer 630 absorbs sunlight having a relatively long wavelength, deterioration mitigation as described above. The effect of mitigation of chromatic aberration is realized. However, since the solar cell 600 of the fourth embodiment has an advantage of focusing a wider range of sunlight than the solar cell 200 of the first embodiment, the solar cell 600 of the first embodiment can be compared with the solar cell 200 of the first embodiment. When you have greater efficiency.

6 illustrates a case in which two light collecting devices 610 and 615 are respectively installed on the upper left side and the upper right side of the first upper electrode 625, but the present invention is not limited thereto. Similar effects exist when only one light collecting device is installed and when three or more light collecting devices are disposed above the first upper electrode 625. In addition, a light collecting device having a reflecting plate formed in an annular shape above the first upper electrode 625 has a similar effect. In addition, the solar cell 600 of the fourth embodiment includes a central concentrator (not shown) and a central concentrator for condensing sunlight incident on the first photoelectric conversion layer 630 without passing through the concentrators 610 and 615. The effect is similar when the center further includes a central photoelectric conversion layer (not shown) formed thereon. In this case, the central light collecting means and the central photoelectric conversion layer correspond to the light converging device 210 and the second photoelectric conversion layer 260 provided in the solar cell 200 of the first embodiment.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific preferred embodiments described above, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

1 is a view schematically showing a structure of a conventional light collecting solar cell.

2 is a view schematically showing the structure of a first preferred embodiment of a solar cell according to the present invention.

3 is a view showing an example of a photoelectric conversion layer in the solar cell according to the present invention.

4 is a view schematically showing the structure of a second preferred embodiment of a solar cell according to the present invention.

5 is a view schematically showing the structure of a third preferred embodiment of the solar cell according to the present invention.

6 is a view schematically showing a structure of a fourth preferred embodiment of a solar cell according to the present invention.

Claims (13)

A first photoelectric conversion layer absorbing the incident sunlight and converting the incident sunlight into an electrical signal; A second photoelectric conversion layer disposed at a front end of the first photoelectric conversion layer on a path of sunlight to absorb incident sunlight and convert it into an electrical signal; And The light condensing is disposed between the first photoelectric conversion layer and the second photoelectric conversion layer on the path of sunlight, and focuses the sunlight to pass through the second photoelectric conversion layer toward the first photoelectric conversion layer. A device; A wavelength of light absorbed by the second photoelectric conversion layer is shorter than a wavelength of light absorbed by the first photoelectric conversion layer, and an area of the second photoelectric conversion layer is larger than an area of the first photoelectric conversion layer. battery. The method of claim 1, The light collecting device includes a lens disposed above the first photoelectric conversion layer and configured to focus the sunlight passing through the second photoelectric conversion layer to face the first photoelectric conversion layer. . The method of claim 1, The light collecting device is disposed below the first photoelectric conversion layer, and includes a reflector for reflecting sunlight passing through the second photoelectric conversion layer toward the first photoelectric conversion layer. . The method of claim 1, The light collecting device includes a solar cell disposed above the first photoelectric conversion layer and having a reflector to reflect the sunlight passing through the second photoelectric conversion layer toward the first photoelectric conversion layer. . delete The method according to any one of claims 1 to 4, The first photoelectric conversion layer is a solar cell, characterized in that provided with a plurality of cells to absorb the incident light and convert it into an electrical signal. The method of claim 6, The wavelength of light absorbed in the cell disposed in the front of the progress path of the sunlight of the plurality of cells is shorter than the wavelength of light absorbed in the cell disposed in the rear end of the path of the sunlight. The method according to any one of claims 1 to 4, The second photoelectric conversion layer is a solar cell, characterized in that provided with a plurality of cells to absorb the incident light and convert it into an electrical signal. The method of claim 8, The wavelength of light absorbed in the cell disposed in the front of the progress path of the sunlight of the plurality of cells is shorter than the wavelength of light absorbed in the cell disposed in the rear end of the path of the sunlight. The method according to any one of claims 1 to 4, A pair of first electrodes formed on both sides of the first photoelectric conversion layer; And And a pair of second electrodes formed on both sides of the second photoelectric conversion layer, respectively. The pair of second electrodes is a solar cell, characterized in that made of a transparent conductive material. The method of claim 2, A third photoelectric conversion layer disposed at a front end of the second photoelectric conversion layer on a path of sunlight to absorb incident sunlight and convert it into an electrical signal; And It is disposed between the second photoelectric conversion layer and the third photoelectric conversion layer on the path of sunlight, and assists to focus the sunlight so that the sunlight passing through the third photoelectric conversion layer toward the second photoelectric conversion layer. And a light collecting device, wherein the wavelength of light absorbed by the third photoelectric conversion layer is shorter than the wavelength of light absorbed by the second photoelectric conversion layer. delete The method of claim 11, A pair of first electrodes formed on both sides of the first photoelectric conversion layer; A pair of second electrodes formed on both sides of the second photoelectric conversion layer; And And a pair of third electrodes formed on both sides of the third photoelectric conversion layer, respectively. The second electrode and the third electrode is a solar cell, characterized in that made of a transparent conductive material.

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