Flexible dye-sensitized solar cell

Abstract

The invention discloses a flexible dye-sensitized solar cell, which comprises a flexible conducting substrate, a dye-sensitized nano-porous semiconductor film, an electrolyte and a flexible counter electrode. The flexible conducting substrate is that an organic conducting polymer film of an organic conducting polymer layer is coated on a high polymer base material, wherein the thickness of the organic conducting polymer layer is between 0.1 and 3 mu m. The flexible dye-sensitized solar cell has the advantages of good surface uniformity, flexibility and transmittance of the conducting substrate, good flexibility of the cell, no crack after optionally curling, good photoelectric properties and long service life.

Description

technical field [0001] The invention relates to a solar cell, in particular to a flexible dye-sensitized solar cell. Background technique [0002] With its characteristics of no pollution, no transportation, no monopoly, simple maintenance, safe operation and inexhaustibility, solar energy is considered to be the best choice to solve the two major problems of energy depletion and environmental pollution, so countries are actively developing this Green renewable energy. In 1991, the solar cell research group led by Professor Gratzel of the Lausanne Institute of Technology in Switzerland successfully developed the dye-sensitized solar cell (DSSC for short). With the continuous improvement of this kind of solar cell by Gratzel et al., the photoelectric conversion efficiency of DSSC reached 11.9%. Compared with the traditionally used silicon solar cells, this low-cost and environmentally friendly solar cell has the advantages of indoor power generation, large cumulative power ...

AI Technical Summary

Problems solved by technology

[0005] One is a high molecular polymer substrate coated with a conductive layer. At present, a layer of inorganic metal oxide ITO (indium tin oxide) conductive layer is commonly used on the high molecular polymer substrate. Disadvantage 1: This layer of ITO The ceramic film is fragile and has poor flexibility, so when the polymer substrate is bent, the ITO conductive film on it is prone to micro cracks, which makes the conductivity of the film worse, and its thermal and chemical stability is also low. It is relatively poor, which will affect the preparation process of the flexible DSSC photoanode and the photoelectric performance and service life of the battery assembled by the flexible DSSC photoanode in the flexible application process

Disadvantage 2: The element indium contained in the ITO conductive film is a rare earth element, the raw material is scarce, and the cost is high

Disadvantage 3: The preparation of ITO conductive film on polymer substrate requires expensive vacuum magnetron sputtering equipment, and the process is relatively complicated

[0006] Another flexible conductive substrate is metal foil, such as stainless steel or titanium foil with a thickness of 0.05-0.2mm. Although its flexibility and thermal stability are good, its disadvantage is that it is opaque. If the metal foil When it is used to make a photoanode, the light must enter from the side of the opposite electrode when the battery is in use.

In this way, on the one hand, the platinum layer on the surface of the counter electrode absorbs and reflects light; on the other hand, the distance of light passing through the electrolyte is longer when it is incident on the counter electrode than when it is incident from the photoanode, that is, the light reaches the semiconductor thin film electrode. Before, it is necessary to pass through the electrolyte between the semiconductor film and the counter electrode. This part of the electrolyte will absorb part of the light again, resulting in a decrease in the short-circuit current.

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