TW200929580A - Electrolyte of solar cell and dye-sensitized solar cell - Google Patents

Abstract

A electrolyte of a solar cell is provided and characterized by including at least one kind of luminescent material. A wavelength of the luminescent material is more than 400 nm. Due to the added luminescent material in the electrolyte of the solar cell, originally unused light can be absorbed, and a light with higher wavelength is then radiated by the property of the luminescent material. Therefore, the radiated light will be reused by the solar cell, and the light utilization efficiency may be consequently increased, whereby accomplish higher efficiency.

Description

200929580 l 26236-1 twf. doc/n IX. Description of the Invention: [Technical Field] The present invention relates to an electrolyte of a solar cell, and in particular to an electrolyte and a dye of a solar cell Dye-Sensitized Solar CeU (DSSC). [Prior Art] Solar cells are a very promising clean energy source that can generate electricity directly from sunlight. However, it is necessary to effectively reduce the production cost of the solar cell so that it is widely accepted and becomes the main power source. In recent years, Gratzel has proposed a so-called dye-sensitized solar cell (DSSC) that can more effectively utilize solar energy sources and become one of the most promising third-generation solar cells after silicon solar cells. In general, the structure of the dye-sensitized solar cell is as shown in FIG. ,, including titanium dioxide (Ti〇2) working electrode 102 and Pt which are respectively disposed on the transparent conductive substrates 10a and 10b to provide a current flow path. The counter electrode 1〇4 and the electrolyte 106 for transmitting the hole. Although the above-described structure of the dye-sensitized solar cell has been partially commercialized, there are still many problems to be overcome. For example, the electrolyte used in general dye-sensitized solar cells is nothing more than the use of iodine and triiodide as a redox couple. When the light passes through the working electrode of titanium dioxide or through the electrolytic cell, it will not be partially It is used. Therefore, there is still room for improvement in utilization. 1 26236-ltwf.doc/n 200929580 SUMMARY OF THE INVENTION The present invention provides an electrolyte solution for a solar cell that can reuse light that is wasted to provide a higher photoelectric conversion rate. The present invention further provides a dye-sensitized solar cell (DSSC) which improves the stability of the battery and, in turn, the availability of the dye-sensitized solar cell. The present invention provides an electrolyte solution for a solar cell comprising an electrolyte containing at least one luminescent material, wherein the luminescent material has a radiation wavelength greater than 400 nm. The present invention further provides a dye-sensitized solar cell (DSSC) comprising a working electrode, a counter electrode, and an electrolyte. Wherein the counter electrode is disposed relative to the working electrode and the electrolyte is located between the working electrode and the counter electrode. Moreover, the electrolyte contains at least one luminescent material, wherein the luminescent material has a radiant wave greater than 400 nm. In an embodiment of the invention, the luminescent substance has a radiation wavelength of, for example, greater than 400 nm and less than 600 nm. In an embodiment of the invention, the luminescent material is, for example, a luminescent material selected from the group consisting of 8-hydroxyquinoline aluminum (A1Q3) and derivatives thereof and ir(bpy)3. In the embodiment of the invention, the above luminescent substance comprises an organic-inorganic luminescent material. In an embodiment of the invention, the electrolyte solution comprises a liquid electrolyte, a colloidal electrolyte or a solid electrolyte. In an embodiment of the invention, the luminescent material accounts for 1% to 10% of the total amount of the electrolyte. In an embodiment of the present invention, the luminescent material package 6 1 26236- ltwf.doc/n 200929580 contained in the above electrolyte solution includes an organic compound or an inorganic compound. In an embodiment of the invention, the counter electrode comprises a transparent conductive substrate plated with platinum.

In an embodiment of the invention, the working electrode comprises a transparent conductive substrate and a metal oxide film formed on the surface of the transparent conductive substrate, wherein the metal oxide film carries a dye. In an embodiment of the invention, the dye comprises a metal complex of ruthenium, rhodium, iron, palladium, Q-face or zinc. In an embodiment of the invention, the dye comprises a metal-free organic compound. In an embodiment of the invention, the material of the metal oxide film comprises Ti〇2, Zn0, Al2〇3, Si〇2 or TixAly〇z (χ=1 ～3, y=1~3 2=1 〜6) ). In an embodiment of the invention, the transparent conductive substrate comprises a transparent conductive glass, a plastic substrate or a metal substrate. Since the luminescent material is added to the electrolyte of the solar cell, the wasted light can be reused, so that the dye can absorb more light again, and the photoelectric conversion rate is improved. Further, the luminescent material of the present invention can suppress partial side reactions 7 caused by light in the electrolytic solution, thereby improving the stability of the battery and, in turn, augmenting the usability of the dye-sensitized solar. The above described features and advantages of the present invention will become more apparent from the following description of the preferred embodiments. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be more fully understood from the following description, taken in the <RTIgt; However, the invention may be practiced in many different forms and should not be construed as being limited to the embodiments set forth below. Rather, these embodiments are provided solely to provide a more complete and complete disclosure of the invention, and the scope of the invention is fully disclosed to those of ordinary skill in the art. In the drawings, the dimensions and relative dimensions of each layer may be exaggerated for clarity. 2 is a schematic cross-sectional view of a dye-sensitized solar cell (DSC) of a dye-sensitized solar cell (DSSC) in accordance with an embodiment of the present invention. Referring to Fig. 2 in May, the dye-sensitized solar cell 2 of the present embodiment includes a working electrode 2〇2, a counter electrode 204, and an electrolyte 206. The counter electrode 204 is disposed relative to the working electrode 202, and the electrolyte 206 is located between the working electrode 2〇2 and the counter electrode 204. Moreover, the electrolyte 206 contains at least one luminescent material 208 having a radiation wavelength greater than 400 nm; for example, the emission wavelength of the luminescent material 2 〇 8 may be between 440 440 and 460 nm at 520 to 550 nm. Between 580 and 600 nm. The electrolyte 206 is, for example, a liquid electrolyte, a colloidal electrolyte or a solid electrolyte. The luminescent material 2 〇 8 may be an organic compound or an inorganic compound. In the present embodiment, the luminescent substance 208 accounts for 1% to 10% of the total amount of the electrolytic solution 206. Referring to FIG. 2, the counter electrode 2〇4 in the present embodiment is, for example, plated with a transparent conductive substrate 212 having platinum 210; the working electrode 202 such as a transparent solar cell 214 and a layer are formed on the surface of the transparent conductive substrate 214. Gold 200929580 1 26236- ltwf.doc/n is an oxide film 216 'where the metal oxide film 216 carries a dye. The above-mentioned dyes are metal complexes of ruthenium, osmium, iron, iridium, platinum or zinc; or metal-free organic compounds. As the material of the above metal oxide film 216, for example, Ti02, Zn0, Al203, SiO 2 or TixAlyOz (x = 1 to 3, y = 1 to 3, z = 1 to 6). The transparent conductive substrates 212 and 214 may be transparent conductive glass, plastic substrate or metal substrate. A spacer 218 is provided between the counter electrode 204 and the working electrode 202 to seal the electrolyte 206. When the incident light 220 is incident on the working electrode 202, the light-irradiating region 222 is necessarily larger than the range covered by the metal oxide film 218. Therefore, there is an unused incident light (represented by a solid arrow) directly incident from the region 224. Into the electrolyte 206. At this time, the luminescent material 208 contained in the electrolyte 206 absorbs these unused incident light and emits light having a wavelength greater than 4 〇〇 nm (represented by a hollow arrow). Further, the incident light 22 is not necessarily completely absorbed, such as UV light, even after passing through the metal oxide film 216. Therefore, the luminescent material 208 in the electrolyte 206 also absorbs light (represented by solid arrows) which is not absorbed by the metal oxide film 216, and emits light having a wavelength greater than ❹400 nm (represented by hollow arrows). Further, although the luminescent material 208 is shown in the form of a circular small particle in Fig. 2, the luminescent material 208 is actually dissolved in the electrolytic solution 206 and thus distributed in the metal oxide film 216 of the working electrode 202. In addition, since the dye adsorbed on the metal oxide film 216 can be different, the present invention can be used in combination with the dye to emit a light-emitting substance of a radiation wavelength, so that the light utilization efficiency can be more effectively adjusted, and the light can be suppressed by using this characteristic. The side reaction caused by the electrolyte 206 achieves high efficiency and stability. The dye sensitized solar cell is 260236-1twf.doc/n 200929580 [Experimental Example 1]

First, a 'preparative-transparent conductive substrate' is formed and a layer of emulsified titanium (plus 2) is formed thereon. Bribe, the titanium dioxide layer is adsorbed at room temperature for about 9 to 18 hours, and then washed with acetonitrile (ΑΝ). Next, a titanium dioxide layer (i.e., a working electrode) and a counter electrode with platinum (pt) are formed into a battery, and an electrolyte containing a luminescent material is injected. Its ten luminescent substances are made with 8#工基圭琳|吕(八11111^11111111:1^(8-}1&gt;^1*0 parent&gt;^1^11〇1^16), also known as AIQ3) ' It contains 1 mg of luminescent material in 1 ml of electrolyte. Finally, the electrolyte injection hole is sealed to complete the fabrication of the dye-sensitized solar cell. [Comparative Example 1] A dye-sensitized solar cell of the control group was completed in accordance with the procedure of [Experimental Example 1] except that the electrolyte contained no luminescent material. 3 is an electrical analysis of the above experimental example (electrolyte containing a luminescent substance in a dye-sensitized solar cell) and a comparative example (an electrolyte containing a luminescent substance in a dye-sensitized solar cell) Graph. The following table shows the efficiency improvement data shown in Figure 3. Table 1----- Jsc (mA/cm2) Voc (V) FF V (%) 16.9 0.769 0.679 8.8 14.8 0.8 A 0.703 8.3 200929580 1 26236-ltwf.doc/n Jsc in Table 1 means short-circuit current (short circuit current), Voc means open circuit current, FF is fill-factor, and 7/ means energy conversion efficiency. As can be seen from FIG. 3 and Table 1, according to the present invention The electrolyte containing the luminescent substance can improve the efficiency of the solar cell. [Experimental Example 2] The same procedure as in the case of [Experimental Example 1] was carried out, but injection of 8-hydroxyquinoline aluminum having different concentrations was carried out in the electrolyte. Then, the effect of the concentration of the luminescent substance on the characteristics of the battery is discussed. [Comparative Example 2] The dye-sensitized solar cell of the control group was completed in accordance with the procedure of [Experimental Example 1] except that the electrolyte contained no luminescent material. Figure 4 is a graph showing the electrical analysis of a multiple adsorbed working electrode in accordance with the present invention and a conventional single adsorbed working electrode. Table 2 below shows the efficiency data shown in Figure 4. Table II---^_ aiq3 concentration (mg/10ml) Jsc (mA/cm2) Voc(V) FF V (%) Experimental example 2_1 1 14.00 0.707 0.650 6.41 Experimental example 2^2 — 10 12.70 0.711 0.676 6.11 Comparative Example 2 12.50 0.693 0.679 5.90 It can be seen from Fig. 4 and Table 2 that the addition of a luminescent substance having a concentration of 1 mg/l 〇ml or 10 mg/10 ml can improve the efficiency of the solar cell. 11 1 26236-ltwf.doc/n 200929580 [Experimental Example 3] The coating method of the titanium dioxide layer is the same as that of the [Experimental Example „], the Z material is selected as Z907, and the same concentration of 8-hydroxyl wood is also injected [Comparative Example 3] Soil station 0 In addition to the electrolyte containing no luminescent material, the dye-sensitized solar cell of the control group was completed according to the experimental procedure. Figure 5 is a multi-adsorbed working electrode and a conventional single according to the present invention. Electrical analysis of the working electrode _. The following three counties of the county show 5 ^^^ data.

As can be seen from Fig. 5 and Table 3, the addition of a different concentration of the luminescent material as the electrolyte of the Ζ907 dye can improve the efficiency of the solar cell. In summary, the present invention adds a light-emitting substance to an electrolyte to absorb unused light, and utilizes the light-emitting characteristics of the light-emitting substance, and then emits light having a longer wavelength, thereby allowing the dye adsorbed on the titanium oxide. Re-use the light emitted by the luminescent material to improve the utilization of light and achieve a more efficient efficiency. In addition, 'due to different dyes can be combined with different wavelengths of luminescent materials', it is possible to more effectively adjust the utilization of light, and use this 12 200929580 26236-ltwf.doc/n characteristics to suppress the side reaction caused by light to the electrolyte, to achieve high Material sensitized solar cells. Although the present invention has been disclosed in the above preferred embodiments, the present invention is intended to be limited to the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is subject to the definition of 5 kg which is attached to the patent application. Ο

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a conventional dye-sensitized solar cell. 2 is a schematic cross-sectional view of a dye-sensitized solar cell in accordance with an embodiment of the present invention. Fig. 3 is a graph showing electrical analysis of Experimental Example 1 and Comparative Example 1 in accordance with the present invention. Figure 4 is a graph showing the electrical analysis of Experimental Example 2 and Comparative Example 2 in accordance with the present invention. Figure 5 is a graph showing the electrical analysis of Experimental Example 3 and Comparative Example 3 in accordance with the present invention. [Main component symbol description] 100a, 100b: transparent conductive substrate 102: titanium dioxide (Ti〇2) layer 104: Pt counter electrode 13 200929580 1 26236-ltwf.doc/n 106: electrolyte 200: dye-sensitized solar cell 202: Working electrode 204: Counter electrode 206: Electrolyte 208: Luminescent substance 210: Platinum 212, 214: Transparent conductive substrate 216: Metal oxide film 218: Spacer 220: Incident light 222: Light irradiation area 224: Area

14

Claims (1)

200929580 1 26236-ltwf.doc/n X. Patent Application Range: 1. An electrolyte for a solar cell, comprising: an electrolyte containing at least one luminescent substance, wherein the luminescent substance has a radiation wavelength greater than 400 nm. 2. The electrolytic solution of a solar cell according to claim 1, wherein the luminescent substance has a radiation wavelength of more than 400 nm and less than 600 nm. 3_ The electrolyte of the solar cell of claim 1, wherein the luminescent substance is selected from the group consisting of 8-hydroxyquinoline aluminum (A1Q3) and its derivatives and Ir(bpy)3 a luminescent material. 4. The electrolytic solution of a solar cell according to claim 1, wherein the luminescent material comprises an organic-inorganic luminescent material. The electrolytic solution for a solar cell according to claim 1, wherein the luminescent material accounts for 1% to 1 〇〇/0 of the total amount of the electrolytic solution. 6. The electrolytic solution of the solar cell of claim 1, wherein the electrolyte comprises a liquid electrolyte, a colloidal electrolyte or a solid electrolyte. 7. A dye-sensitized solar cell comprising: a working electrode; a pair of electrodes 'configured relative to the working electrode; and an electrolyte 'between the working electrode and the pair of electrodes, wherein the electrolyte contains at least one luminescent substance Wherein the luminescent material has a radiation wave greater than 400 nm. 8. The dye-sensitized solar cell of claim 7, wherein the luminescent material contained in the electrolyte has a radiation wavelength greater than 400 nm and less than 600 nm. 9. The dye-sensitized solar cell of claim 7, wherein the luminescent material contained in the electrolyte is selected from the group consisting of 8-hydroxyquinoline aluminum (A1Q3) and its street organisms, and is composed of a banknote A kind of hair _ light material in the ethnic group. The dye-sensitized solar cell of claim 7, wherein the electrolyte comprises a liquid electrolyte, a colloidal electrolyte or a solid electrolyte solution. 11. The dye-sensitized solar cell of claim 7, wherein the luminescent material contained in the electrolyte comprises an organic compound or an inorganic compound. 12. The dye-sensitized solar cell of claim 7, wherein the luminescent material contained in the electrolyte comprises an organic-inorganic luminescent material. 13. The dye-sensitized solar cell of claim 7, wherein the side luminescent material accounts for 1% to 1 〇〇/0 of the total amount of the electrolyte. 14. The dye-sensitized solar cell of claim 7, wherein the pair of electrodes comprises a transparent conductive substrate forged with platinum. 15. The dye-sensitized solar cell of claim 7, wherein the working electrode comprises: a transparent conductive substrate; and a metal oxide film formed on the surface of the transparent conductive substrate, the metal oxide The thin crucible carries a dye. 16 200929580 1 26236-ltwf.doc/n 16. The dye-sensitized solar energy of claim 15 wherein the dye includes ruthenium, osmium, iron, ruthenium, zinc or zinc. The dye-sensitized solar power of claim 1, wherein the dye comprises a metal-free organic compound. The dye-sensitized solar energy according to the fifteenth item of the patent application, wherein the material of the metal oxide film comprises Ti〇2, ZnO, Al2〇3, •〇2 into jwn holes·r 1 to j, y= i~3 with z=l~6.染料 χίχΑΐγ〇ζ, wherein Χ=1 ～3, Sl 2; L9. The dye-sensitized solar power according to claim 15, wherein the transparent conductive substrate comprises a transparent conductive glass, a plastic substrate or a food Belong to the base.