Thin-film solar cell and manufacture method thereof

Abstract

The invention discloses a thin-film solar cell. The thin-film solar cell comprises a substrate, wherein a compound transparent conducting thin film layer, a photoelectric converting thin film layer and a back electrode layer are arranged on the substrate, and a silver thin film layer is arranged on one side of the compound transparent conducting thin film layer. Due to the fact that the silver thin film layer is added in the thin-film solar cell, conductivity of the whole thin-film solar cell can be improved through a high transmittance and an optimal conductivity of the silver thin film layer, a good light ray transmittance can also be guaranteed, light rays absorbed by the thin-film solar cell are enabled to be increased, and then conversion efficiency is improved. Due to the fact that the silver thin film layer is arranged on one side of the compound transparent conducting thin film layer, the compound transparent conducting thin film layer is enabled to provide support for the silver thin film layer, the problem of texture surface making of the silver thin film layer and the technical problem that the thin-film solar cell is in an open circuit caused by the fact that a P2 scribed line and a P3 carving line can carve the sliver thin film layer in the production process of the thin-film solar cell also can be solved, and normal electric conduction of the thin-film solar cell is guaranteed.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a thin-film solar cell and a method for manufacturing the thin-film solar cell. Background technique [0002] In recent years, the solar cell industry has developed rapidly. With the continuous reduction of costs, solar cells are gradually entering people's lives and playing an increasingly important role. Thin-film solar cell is a kind of solar cell. It uses thin-film materials with a thickness of only a few hundred nanometers to realize photoelectric conversion. Excellent performance, excellent high-temperature power generation performance, strong comprehensive power generation capacity, etc. [0003] At present, thin-film solar cells are divided into silicon-based thin-film solar cells, cadmium telluride thin-film solar cells, and copper indium gallium selenide thin-film solar cells. The main difference between them is that the materials used for the core photoelectric co...

AI Technical Summary

Problems solved by technology

[0009] 1. The material characteristics of the compound film determine that its conductivity is not ideal, the conductivity index is low, and its conductivity is far worse than that of metal materials, but ordinary metal materials have low optical transmittance and are not suitable for transparent conductive films;

[0010] 2. In order to improve the actual conductivity of the film, it is usually necessary to make the compound film thicker (for thin-film solar cells, the thickness of the film is usually required to be hundreds of nanometers before it has practical value), and the thicker film brings about the improvement of the conductivity At the same time, the loss of light when passing through the film is greatly increased, resulting in a decrease in light transmittance, reducing the light absorbed by the solar cell, and reducing the conversion efficiency.

[0011] Therefore, for the existing compound transparent conductive thin film materials, the mutual restriction of conductive performance and light transmission performance makes it difficult to further improve the performance of the thin film, which is not conducive to improving the efficiency of solar cells

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