Composite electrode of solar battery and preparation method thereof

Abstract

The invention discloses a composite electrode of a dye-sensitized solar battery, comprising an electric-conduction substrate, a porous semiconductor electrode layer formed on the electric-conduction substrate and a semiconductor nano-particle membrane layer adsorbed on the semiconductor electrode layer. The technical proposal is that: a Ti membrane formed by evaporation or sputtering and a transparent electric-conduction wave membrane form good interface contact, therefore, good interface contact of the transparent electric-conduction substrate and a nano TiO2 layer is formed after a TiO2 nano-pore structure is prepared by an anodic oxidation method, thereby effectively avoiding transportation loss of pho-electrons on the interface of the transparent electric-conduction substrate and the nano TiO2 layer. The whole working electrode is composed of a TiO2 nano-pore structure and TiO2 nano particles, and the contact of the TiO2 nano-pore structure and the TiO2 nano particles is good, so as to lead the electrons to be transmitted better and improve the photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a composite electrode of a dye-sensitized solar cell and a preparation method thereof. Background technique [0002] Dye-sensitized solar cells are a new type of cells that imitate the principle of photosynthesis. 1991 Swiss scientist et al. used TiO for the first time 2 Nanocrystalline electrode technology has successfully demonstrated dye-sensitized solar cells with conversion efficiencies of 7%. Because the dye-sensitized solar cell has the advantages of simple manufacturing process, green manufacturing process, and low manufacturing cost, it has attracted people's attention and developed rapidly. [0003] The preparation process of the working electrode of the traditional dye-sensitized nanocrystalline solar cell is: on the conductive substrate (glass with transparent conductive film), coat the appropriate thickness of TiO 2 Nanoparticles are formed by sintering. TiO 2 Nanop...

AI Technical Summary

Problems solved by technology

[0004] However, there are many problems in the preparation of the working electrode of the dye-sensitized solar cell by the traditional method: First, by coating TiO 2 The nano-film formed by sintering the nanoparticles and the transparent conductive film on the conductive glass substrate is not easy to form a good contact, which causes a part of the photo-generated electrons to be lost at the interface of the conductive substrate, which affects the transmission of the photo-generated electrons, thus making the photoelectricity of the battery Reduced conversion efficiency

Secondly, TiO 2 The interface contact between nanocrystalline particles and the conductive substrate is not complete, resulting in direct contact between the surface of the local conductive substrate and the electrolyte, and the electrons react with the oxidant in the electrolyte, resulting in the loss of photogenerated electrons

On the other hand, when the light is irradiated on the dye-sensitized solar cell, it shines into the interior of the cell through the conductive glass, and then shines on the counter electrode through the conductive glass, resulting in a part of the incident light not being effectively utilized (that is, being absorbed by the dye), Reduces the effective utilization of light, which is not conducive to improving the photoelectric conversion efficiency

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