KR101160933B1 - Dye-sensitized solar cell with elongated photonic way - Google Patents

Abstract

Dye-sensitized solar cells with a long optical path are disclosed.

A dye-sensitized solar cell according to the present invention includes a first substrate provided with a polymer resin disposed to face each other and a second substrate having a plurality of bubbles so as to have a high reflectance including diffusion reflectance;

It includes a plurality of metal oxide layer provided on the first substrate, a large specific surface area for the photochemical reaction, and chemically adsorbed to the metal oxide layer, the dye layer which can supply the excited electrons Semiconductor electrodes;

A counter electrode disposed to face the semiconductor electrode, the counter electrode being formed in a predetermined pattern on a lower portion of the second substrate so that electrons generated by the semiconductor electrode are energized; And

An electrolyte solution interposed between the semiconductor electrode and the counter electrode and capable of supplying electrons to the dye layer by an oxidation-reduction reaction, comprising: a variety of types of modules for mounting an outer wall of a building or a solar cell While having a flexible (flexible) characteristics according to the increase in the photovoltaic conversion efficiency by lengthening the path of sunlight incident into the solar cell.

Description

Dye-sensitized solar cell with elongated photonic way

1 is a schematic view showing the structure of a conventional conventional dye-sensitized solar cell.

2 is a view showing the driving principle of the dye-sensitized solar cell according to an embodiment of the present invention.

3 is a partial cross-sectional view showing a dye-sensitized solar cell according to another embodiment of the present invention.

4 is a partially enlarged cross-sectional view of a dye-sensitized solar cell according to another embodiment of the present invention.

5 is a partially enlarged cross-sectional view of a dye-sensitized solar cell according to another embodiment of the present invention.

6 is a partially enlarged view showing a counter electrode of a dye-sensitized solar cell according to another embodiment of the present invention.

7 is a graph measuring the reflectance of sunlight when the average particle diameter of the bubbles of the dye-sensitized solar cell according to another embodiment of the present invention is 50㎛.

8 is a graph showing the reflectance of sunlight when the average particle diameter of the bubbles of the dye-sensitized solar cell according to another embodiment of the present invention is 75㎛.

9 is a graph showing the reflectance of sunlight when the average particle diameter of the bubbles of the dye-sensitized solar cell according to another embodiment of the present invention is 100㎛.

10 is a graph measuring the reflectance of sunlight when the average particle diameter of the bubbles of the dye-sensitized solar cell is 125 µm in order to compare with the examples according to FIGS. 7, 8 and 9 of the present invention.

FIG. 11 is a graph measuring reflectance of sunlight when the average particle diameter of the bubbles of the dye-sensitized solar cell is 150 µm in order to compare with the examples according to FIGS. 7, 8, and 9 of the present invention.

The present invention relates to a dye-sensitized solar cell with a long optical path, and more particularly, has a flexible characteristic according to various forms of a module for mounting an outer wall of a building or a solar cell, and the solar incident into the solar cell. The present invention relates to a dye-sensitized solar cell that increases the path of light to increase photoelectric conversion efficiency.

Since the development of the dye-sensitized nanoparticle titanium dioxide (Anatase structure) solar cell in 1991 by Michael Gratzel of the Swiss National Lausanne Institute of Advanced Technology (EPFL), much work has been done in this area. Dye-sensitized solar cells have the potential to replace conventional amorphous silicon solar cells because they have lower manufacturing cost and higher energy conversion efficiency than conventional p-n type solar cells. Unlike silicon solar cells, dye-sensitized solar cells are photoelectrochemical solar cells whose main components are dye molecules capable of absorbing visible light to generate electron-hole pairs, and transition metal oxides that transfer the generated electrons. .

1 is an explanatory view showing the operation principle of a conventional dye-sensitized solar cell, when the sunlight is absorbed by the metal oxide electrode 11 chemically adsorbed on the surface of the dye layer (not shown) in the dye layer bottom state In the excited state, the electrons transition to form an electron-hole pair, and the excited electrons (e ⁻ ) are injected into the conduction band (Ecb) of the metal oxide. The electrons injected into the metal oxide electrode 11 are transferred to the transparent conductive film 10 in contact with the metal oxide electrode through an interparticle interface, and the external circuit or load 140 connected to the transparent conductive film 10 is transferred. Through the counter electrode 13 and the closed circuit is formed. An oxidation-reduction electrolyte solution 12 is injected between the counter electrode 13 and the metal oxide electrode 11 so that electrons supplied from the metal oxide electrode 11 to an external circuit or load are insufficient. It is supplied from (12) and returned to its original state.

Since the energy conversion efficiency of the solar cell is proportional to the amount of electrons generated by light absorption, the amount of dye molecules must be increased to generate a large amount of electrons, but the optical path of the solar light incident into the solar cell is increased. It must be long so that excited electrons can continuously flow into the conduction band of the metal oxide. In order to increase the light path of the solar light, the remaining solar light, which is not used for photoelectric conversion, in the solar cell does not escape to the outside, and must be repeatedly reflected in the solar cell and used for photoelectric conversion.

In order to solve this problem, a plurality of technologies are provided in which the counter electrode 13 is disposed to face the metal oxide electrode 11 and the front surface is coated. However, the counter electrode disposed on the front surface has a limit in reflectance and reflects according to the incident angle of sunlight. Therefore, there is a problem that the photoelectric conversion efficiency is affected by the incident angle of sunlight.

Meanwhile, as the necessity of a solar cell added with a flexible characteristic to match various shapes of an outer wall of a building or a module on which a solar cell is mounted increases, a number of technologies such as Korean Patent Publication No. 0499271 have been disclosed. Only the technique of improving the reflectivity by the metal electrode as a counter electrode is disclosed, and also there existed a problem that the photoelectric conversion efficiency by low reflectance falls.

Therefore, the technical problem to be achieved by the present invention is to have a flexible (flexible) characteristics according to various types of modules for mounting the outer wall of the building or the solar cell, while increasing the path of the solar light incident into the solar cell to increase the photoelectric conversion efficiency It is to provide a dye-sensitized solar cell to increase.

The present invention to achieve the above technical problem,

A second substrate having a plurality of bubbles such that a first substrate made of a polymer resin disposed to face each other and a reflectance including diffusion reflectance are high;

It includes a plurality of metal oxide layer provided on the first substrate, a large specific surface area for the photochemical reaction, and chemically adsorbed to the metal oxide layer, the dye layer which can supply the excited electrons Semiconductor electrodes;

A counter electrode disposed to face the semiconductor electrode, the counter electrode being formed in a predetermined pattern on a lower portion of the second substrate so that electrons generated by the semiconductor electrode are energized; And

An electrolyte solution capable of supplying electrons to the dye layer by an oxidation-reduction reaction interposed between the semiconductor electrode and the counter electrode provides a dye-sensitized solar cell including a long optical path.

In addition, the bubble may be provided to protrude to the inside of the second substrate or the surface.

In addition, the bubble may have an average particle diameter of 100 μm or less, and the diffusion reflectance may be 90% or more.

The counter electrode may be provided in a plurality of stripe shapes or grid patterns.

In addition, the first substrate and the second substrate may have a planar shape having a flexible characteristic.

A conductive buffer layer may be further provided between the counter electrode and the second substrate to achieve electrical and physical stability for stacking the counter electrode and the second substrate.

An antireflection layer may be further provided below the first substrate, and the antireflection layer may be smaller than the refractive index of the first substrate.

Hereinafter, the present invention will be described in more detail.

Dye-sensitized solar cell according to the present invention has a flexible (flexible) characteristics according to the various forms of the outer wall of the building or the module for mounting the solar cell, while increasing the photovoltaic conversion efficiency by lengthening the path of sunlight incident into the solar cell There is a characteristic to let.

Although the present invention will be described with reference to the accompanying drawings, embodiments of the present invention illustrated in the following may be modified in many different forms, the scope of the present invention is not limited to the embodiments described in the following.

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. In the drawings, the size or thickness of films or regions is exaggerated for clarity.

First, Figure 2 is a view showing the principle of the solar cell according to the present invention, referring to Figure 2, the application of the principle of photosynthesis, when sunlight is irradiated photons (photon) is first absorbed in the dye, the dye material itself of E _g that can overcome the energy band gap (E _g) When the above energy is absorbed, the electrons existing in the valence band are converted into the excited state, and transition to the electron conduction band.

The transitioned electrons move to the metal oxide electrode and then to the external circuit. The dye is oxidized after the electrons are transferred to the electron conduction band, but the electrons are received from the electrolyte solution and reduced to their original state.

3 is a cross-sectional view showing a dye-sensitized solar cell according to an embodiment of the present invention.

Referring to FIG. 3, the dye-sensitized solar cell according to the present invention includes a first substrate 200 and a second substrate 250 facing each other, and sequentially on the surface facing the second substrate of the first substrate, transparency. The semiconductor layer 220 is provided on the entire layer 210 and an upper portion thereof. In addition, a counter electrode 240 is provided on a surface of the second substrate 250 facing the first substrate 200.

In addition, an internal space 230 is provided between the semiconductor electrode 220 and the counter electrode 240 to fill the electrolyte solution in which the oxidation-reduction reaction occurs. In addition, the first and second substrates 200 and 250 need to be sealed. To this end, a sealing unit (not shown) is provided along the outer ends of the first and second substrates 200 and 250. Such a seal may be formed of a thermoplastic polymer film.

Meanwhile, the first substrate 200 is made of polyethersulphone (PES), polyacrylate (PAR, polyacrylate), polyether imide (PEI, polyetherimide), polyethylene naphthalate (PEN, polyethyelenen napthalate), polyethylene terephthalate (PET, polyethyeleneterepthalate), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose tri acetate (TAC), cellulose acetate propionate (cellulose It may be composed of a polymer-based resin containing at least one of acetate propinonate (CAP), but it does not need to be particularly limited within the range of high transmittance in order to transmit sunlight to increase photoelectric conversion efficiency.

In addition, the second substrate 250 may use a highly reflective plastic material in order to minimize the loss of sunlight incident into the solar cell through the first substrate. In particular, the second substrate 250 may include a plurality of bubbles having an average particle diameter of 100 μm or less therein. It is artificially subjected to a foaming process so as to have a high reflectance including diffusion reflectance of external light. Preferably, polyether sulfone (PES), polyacrylate (PAR, polyacrylate), polyether imide (PEI, polyetherimide), polyethylene naphthalate (PEN, polyethyelenen napthalate), polyethylene terephthalate (PET, polyethyeleneterepthalate), In polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose triacetate (TAC), cellulose acetate propinonate (CAP) It includes a plurality of bubbles artificially foamed by applying a thermal or mechanical method to the polymer resin including at least one, and reflects the incident sunlight to the internal space 230, to drive the solar cell with a small light loss Can be very effective.

In addition, the bubble may be formed inside the second substrate, of course, may be provided to protrude to the top of the surface of the second substrate, where the diffuse reflection occurs in the convexly protruding portion.

In addition, the bubbles formed on the second substrate is preferably configured to have an average particle diameter of 100㎛ or less, if the average particle diameter of the bubbles exceeds 100㎛ there is a problem that the surface roughness becomes non-uniform, rather the reflectivity is lowered.

On the other hand, the surface of the second substrate is formed by a plurality of bubbles protruding, the solar light incident into the solar cell is reflected by this protruding shape. The higher the reflectance of the second substrate having the concave-convex surface is, the more effective the diffusion reflectance is preferably at least 90%.

In general, the reflectivity of the metals used as the counter electrode is difficult to exceed 90%, and the reflectance rapidly drops near the red wavelength. As a result, the reflectance is high and there is no problem that the reflectance is reduced near the red wavelength.

In addition, the second substrate according to the present invention is diffusely reflected by the above-described protruding surface and has a diffusion reflectivity of 90% or more. Here, the diffuse reflectance refers to the ratio of diffused light to incident light on the surface and the brightness of the surface color. Normally, the measurement is performed at a horizontal angle of 0 degrees with an incident angle of 45 degrees with respect to the normal of the surface. This can be confirmed through FIGS. 7 to 9. 7 is an average particle diameter of the bubble of the dye-sensitized solar cell according to another embodiment of the present invention is 50㎛, Figure 8 is an average particle diameter of the bubble of the dye-sensitized solar cell according to another embodiment of the present invention is 75㎛ In the case of Figure 9 is a graph measuring the reflectance of sunlight when the average particle diameter of the bubble of the dye-sensitized solar cell according to another embodiment of the present invention is 100㎛.

7, 8 and 9, by using a polyethylene terephthalate (PET, polyethyeleneterepthalate) as a second substrate to prepare the average particle diameter of the bubble 50㎛, 75㎛, 100㎛ respectively to measure the diffuse reflectance for each As a graph, the results of the measurement in the visible region (400 nm ~) show that the diffuse reflectances of about 97%, 96%, and 95% are observed for each, and there is no drop in reflectance even in the red wavelength region. have. On the other hand, when the average particle diameter of the bubbles exceeds 100㎛ can be seen by comparing the diffusion reflectance with the size of the bubble of the dye-sensitized solar cell according to the present invention. 10 is in accordance with FIGS. 7, 8 and 9 of the present invention when the average particle diameter of the bubbles of the dye-sensitized solar cell is 125 µm for comparison with the examples according to FIGS. 7, 8 and 9 of the present invention. In order to compare with an Example, when the average particle diameter of the bubble of a dye-sensitized solar cell is 150 micrometers, it is a graph which measured the reflectance of sunlight.

10 and 11, the polyethylene terephthalate (PET, polyethyeleneterepthalate) as a second substrate is prepared by the average particle diameter of the bubble 125㎛, 150㎛, respectively, the diffusive reflectance for each graph is measured Approximate 89% and 86% diffuse reflectance is shown. This indicates that the reflectance is reduced when the average particle diameter of the bubbles of the second substrate of the dye-sensitized solar cell according to the present invention is exceeded.

Meanwhile, sunlight passing through the first substrate is irradiated to a dye layer (not shown) chemically adsorbed on the surface of the semiconductor electrode 220. The dye layer is chemically transitioned from the ground state to the excited state by irradiated sunlight, and the electrons in the excited state are supplied to an external circuit or load through the semiconductor electrode.

In addition, the dye layer may be composed of a variety of dyes, including ruthenium (Ru) complex can be made of a material that can absorb visible light, ruthenium (Ru) is an element belonging to the platinum group can make many organic metal complexes. Element.

In addition, it is a matter of course that any one can be used as long as it is a dye that can improve efficiency by improving long-wavelength absorption in sunlight and emit electrons efficiently. In addition, the dye layer may be provided with organic dyes having various colors, rich in materials, and inexpensive. For example, cuemarine (pheophorbide a), a kind of porphyrin (porphyrin) and the like can be used alone or mixed with Ru complex.

On the other hand, semiconductor electrodes include titanium (Ti) oxide, zirconium (Zr) oxide, strontium (Sr) oxide, zinc (Zn) oxide, indium (In) oxide, iridium (Yr) oxide, lanthanum (La) oxide, vanadium ( V) oxide, molybdenum (Mo) oxide, tungsten (W) oxide, tin (Sn) oxide, niobium (Nb) oxide, magnesium (Mg) oxide, aluminum (Al) oxide, scandium (Sc) oxide, gallium (Ga) ), Indium (In) oxide and SrTi oxide may be composed of one or two or more composites.

Meanwhile, an empty space called an inner space 230 is provided between the semiconductor electrode 220 and the counter electrode 240, and the electrolyte solution is injected therein. Since the oxidation-reduction reaction occurs in the electrolyte solution, the dye layer receives electrons from the electrolyte solution again. The electrolyte solution filled in the internal space 230 may be a mixture of tetrapropylammonium iodide, iodine (I ₂ ), ethylene carbonate, ethylene carbonate, acetonitrile, and the like. . In addition, various materials may be used within the range in which electrons may be supplied to the dye layer by redox reaction.

Meanwhile, a conductive buffer layer may be further provided between the second substrate and the counter electrode. This can be explained through FIG. 4. Figure 4 is an enlarged cross-sectional view of a part of the dye-sensitized solar cell according to another embodiment of the present invention, the detailed description of the same or similar matters of the dye-sensitized solar cell described in FIG.

Referring to FIG. 4, a conductive buffer layer 345 is interposed between the second substrate 350 and the counter electrode 340. It corresponds to part A in FIG. This is because the counter electrode 340 may be formed of a thin film, and the adhesion between the counter electrode 340 and the second substrate 350, which is such a thin film, may be improved, and electrical contact resistance may be reduced. In order to provide a conductive buffer layer 345, the term electrical means a resistive component in particular. When the counter electrode is formed of a thin film, the surface resistance value is high, so that the conductive buffer layer 345 is laminated. This is to compensate for the resistance value.

Examples of the material used as the conductive buffer layer 345 include indium tin oxide (ITO), indium zinc oxide (IZO), indium oxide (In ₂ O ₃ ), tin dioxide, and fluorine-doped indium tin oxide (FTO). There is no need to specifically limit within the range that can maintain the adhesion and improve the electrical properties. The conductive buffer layer 345 may be formed by a method such as sputtering, chemical vapor deposition (CVD), evaporation, thermal oxidation, and electrochemical anodization. have.

In addition, a counter electrode 340 is stacked below the conductive buffer layer 345. The counter electrode 340 may use platinum (Pt) or a noble metal material, and the higher the reflectance, the longer the optical path of the sunlight transmitted to the internal space (FIGS. 2 and 230), and thus, the efficiency is high. Can be.

Here, the counter electrode 340 may be provided in various patterns, and may be formed over the entire lower surface of the second substrate 350. Also, the counter electrode 340 may be formed through the second substrate having high reflectivity. Various characteristic patternings are possible to lengthen the optical path.

6A and 6B are partially enlarged views of a dye-sensitized solar cell according to another embodiment of the present invention. Referring to FIG. 6A, it can be seen that the counter electrode 540a is formed in a stripe pattern, and the diffuse reflectance is higher than that of the sunlight incident into the solar cell is reflected by the stripe counter electrode 540a. It is more effective for the photoelectric conversion to reflect from the second substrate having a high reflectance, including. Here, a second substrate (not shown) is provided below the counter electrode 540a to make the optical path longer by reflection and diffusion reflection.

6B, the counter electrode 540b is provided in a lattice pattern. While electrically connected to each other in an orthogonal shape for conduction of electricity, grooves are formed regularly, and the sunlight irradiated through the grooves can be reflected by the second substrate. Of course, although not shown in the lower portion of the groove is provided with a second substrate according to the present invention.

On the other hand, Figure 5 is an enlarged view of a portion of the dye-sensitized solar cell according to another embodiment of the present invention.

Referring to FIG. 5, unlike FIG. 3, a portion corresponding to B in FIG. 3 is further provided with an anti-reflection layer 405 under the first substrate 400. The refractive index of the antireflection layer 405 is preferably lower than the refractive index of the first substrate 400. According to the classical optical principle, a medium having a large refractive index is called a dense medium, and when light propagates from the dense medium to a small medium, all the light is reflected at the boundary surface above a certain critical angle, thereby using this principle. Not only the light incident to the dye-sensitized solar cell according to the present invention can be reflected by the second substrate and absorbed by the dye, but also the unabsorbed light is reflected back at the interface between the first substrate and the anti-reflection layer and absorbed by the dye. Can be. As a result, the sunlight incident into the solar cell per unit time is effectively used to improve the photoelectric conversion efficiency. For example, polyetherimide (PEI) is 1.66, polyethyelenen napthalate (PEN) is 1.5 to 1.75, polyethylene terephthalate (PET) is 1.575 to 1.65, and polyimide is 1.64. To 1.67, polycarbonate (PC) is 1.586, cellulose triacetate (TAC) is 1.48,

The cellulose acetate propinonate (CAP) is known to have 1.475. When the polyethylene terephthalate (PET, polyethyeleneterepthalate) is used as the second substrate, the antireflective layer has a lower refractive index than that of cellulose triacetate. TAC), cellulose acetate propinonate (CAP) and the like can be used.

Hereinafter, an embodiment of the dye-sensitized solar cell with a long optical path according to the present invention will be described. However, it is not limited to the present invention within the same or equivalent range by the above-described production examples.

Example 1

First, as a transition metal oxide to form a metal oxide layer, a dispersion is prepared in which titanium oxide is distributed in an average particle size of about 5 to 15 nm. Next, the titanium oxide dispersion was coated on polyethylene terephthalate (PET) having a thickness of 300 μm and a size of 2 cm × 2 cm as a first substrate by using a screen printing method. Here, in the polyethylene terephthalate, before coating the titanium oxide, cellulose tri acetate is laminated to form an antireflection layer, and indium tin oxide (ITO) is laminated in a sputtering manner to form a semiconductor electrode. IR) dried at 150 ° C. for 10 minutes in a drying furnace (manufactured by Eugene Co., Ltd., Korea) to form a metal oxide layer. Next, 0.3mM Ru (4,4'-dicarboxy-2,2'-bipyridine) ₂ (NCS) ₂ dye was coated on the metal oxide layer at 150 ° C. in an Infrared (IR) drying furnace. Dried over minutes. Next, as a second substrate having a large number of bubbles of 50 μm, indium tin oxide was laminated on the polyethylene terephthalate (PET) having a thickness of 300 μm and a size of 2 cm × 2 cm under the above conditions, followed by a sputtering method. By forming a counter electrode with platinum (Pt) having a surface resistance of less than 0.5 ohm. When platinum is sputtered, the counter electrodes are stacked in a lattice pattern using a mask having a plurality of holes in a lattice shape. Next, the conductive tape was heated and pressed to the point where each of the first substrate and the second substrate was about 3 mm from one end in the opposite direction. Next, SURLYNs having a thickness of about 60 μm are disposed to face each other in order to seal the first and second substrates, and the conductive tapes are disposed in opposite directions by about 3 mm apart from each other by the distance between the conductive tapes. (Trade name, manufactured by Du Pont) was placed along the peripheral edge of the first substrate and the second substrate, and thermally crimped for about 9 seconds at about 100 degrees to seal the first substrate and the second substrate. Next, fine holes were drilled using a drill of about 0.75 mm diameter for injection of the electrolyte solution. The micropores contain an electrolyte solution in which 21.928 g of tetrapropylammonium iodide and 1.931 g of I ₂ are dissolved in a solvent consisting of 80% ethylene carbonate and 20% acetonitrile. Injected. An electrolyte solution was injected through the micropores, and the micropores were blocked using SURLYN described above to manufacture a dye-sensitized solar cell.

Example 2

As a second substrate having a large number of bubbles of 75㎛ was carried out in the same manner as in Example 1 except that indium tin oxide was laminated on polyethylene terephthalate (PET) having a thickness of 300㎛ and 2cm × 2cm Dye-sensitized batteries were prepared.

Example 3

A second substrate having a large number of bubbles having a thickness of 100 μm was carried out in the same manner as in Example 1 except that indium tin oxide was laminated on polyethylene terephthalate (PET) having a thickness of 300 μm and a size of 2 cm × 2 cm. Dye-sensitized batteries were prepared.

Comparative Example 1

 A second substrate having a large number of bubbles of 125 µm was carried out in the same manner as in Example 1 except that indium tin oxide was laminated on polyethylene terephthalate (PET) having a thickness of 300 µm and a size of 2 cm × 2 cm. Dye-sensitized batteries were prepared.

Comparative Example 2

As a second substrate having a large number of bubbles of 150㎛ was carried out in the same manner as in Example 1 except that indium tin oxide was laminated on polyethylene terephthalate (PET) having a thickness of 300㎛ and 2cm × 2cm Dye-sensitized batteries were prepared.

Test Example 1

The reflectance of the second substrates used in the dye-sensitized solar cells prepared in Examples 1 to 3 and Comparative Examples 1 and 2 was measured. 7, 8 and 9, by using a polyethylene terephthalate (PET, polyethyeleneterepthalate) as a second substrate to prepare the average particle diameter of the bubble 50㎛, 75㎛, 100㎛ respectively to measure the diffuse reflectance for each As a graph, the results of the measurement in the visible region (400 nm ~) show that the diffusive reflectances of about 97%, 96%, and 95% are observed for each of them, and there is no drop in reflectance even in the red wavelength region. . On the contrary, it can be confirmed through Comparative Examples 1 and 2 that the average particle diameter of the bubble exceeds 100 μm, and FIG. 10 shows that the average particle diameter of the bubble of the second substrate manufactured by Comparative Example 1 is 125 μm. 11 shows that the reflectances of the comparative examples 1 and 2 are 89% and 86%, respectively, as a result of measuring reflectance when the average particle diameter of the bubbles of the second substrate manufactured by Comparative Example 2 is 150 µm. It is showing. Therefore, it can be seen that the above Examples 1 to 3 show excellent diffusion reflectance, so that the photoelectric conversion efficiency of the dye-sensitized solar cell is excellent.

Dye-sensitized solar cell according to the present invention has a flexible (flexible) characteristics according to the various forms of the outer wall of the building or the module for mounting the solar cell, while increasing the photovoltaic conversion efficiency by lengthening the path of sunlight incident into the solar cell It is effective to let.

Claims (8)

A second substrate having a plurality of bubbles such that a first substrate made of a polymer resin disposed to face each other and a reflectance including diffusion reflectance are high; It includes a plurality of metal oxide layer provided on the first substrate, a large specific surface area for the photochemical reaction, and chemically adsorbed to the metal oxide layer, the dye layer which can supply the excited electrons Semiconductor electrodes; A counter electrode disposed to face the semiconductor electrode, the counter electrode being formed in a predetermined pattern on a lower portion of the second substrate so that electrons generated by the semiconductor electrode are energized; And And an electrolyte solution interposed between the semiconductor electrode and the counter electrode to supply electrons to the dye layer by an oxidation-reduction reaction. The method of claim 1, The bubble is a dye-sensitized solar cell with a long optical path, characterized in that the bubble protrudes in the interior of the second substrate or above. The method of claim 1, The bubble is a dye-sensitized solar cell with a long optical path, characterized in that the average particle diameter is 100㎛ or less. The method of claim 1, Dye-sensitized solar cell with a long optical path, characterized in that the diffusion reflectance is 90% or more. The method of claim 1, The counter electrode is a dye-sensitized solar cell with a long optical path, characterized in that provided in a plurality of stripe or grid pattern. The method of claim 1, The first substrate and the second substrate is a dye-sensitized solar cell with a long optical path, characterized in that the planar shape having a flexible (flexible) characteristics. The method of claim 1, The dye-sensitized solar cell with a long optical path, further comprising a conductive buffer layer between the counter electrode and the second substrate to achieve electrical and physical stability for stacking the counter electrode and the second substrate. The method of claim 1, An anti-reflection layer is further provided below the first substrate, wherein the anti-reflection layer has a longer optical path, which is smaller than the refractive index of the first substrate.

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