Cadmium telluride thin film solar battery and preparation method thereof

Abstract

The invention discloses a cadmium telluride thin film solar battery. The cadmium telluride thin film solar battery comprises a substrate layer, a light absorbing layer, a back contact layer and a backelectrode layer which are arranged sequentially from bottom to top; the light absorbing layer is a cadmium telluride film layer; and the back contact layer is composed of an antimony telluride and copper selenide composite material. According to the cadmium telluride thin film solar battery of the invention, the back contact layer made of the antimony telluride and copper selenide composite material can form good ohmic contact with the cadmium telluride light absorbing layer, and therefore, potential barriers are lowered, and doped copper selenide can effectively eliminate the defects of thecadmium telluride light absorbing layer, and after selenium diffuses to a cadmium telluride interface, the forbidden band width of the cadmium telluride can be effectively increased, and presents deep-V type gradient change; and the initial performance and long-term stability of the battery are excellent, and the conversion efficiency of the battery is high.

Description

technical field [0001] The invention relates to the technical field of thin-film solar cells, in particular to a cadmium telluride thin-film solar cell and a preparation method thereof. Background technique [0002] Cadmium telluride thin-film solar cell is referred to as CdTe cell, which is a thin-film solar cell based on the heterojunction of p-type CdTe and n-type CdS. In 1993, the University of South Florida used the sublimation method in 1cm 2 A solar cell with a conversion efficiency of 15.8% was made in terms of area; subsequently, the CdTe small-area cell researched by Japan's Matsushita Battery had a maximum conversion efficiency of 16% in the laboratory, which became the highest record for cadmium telluride thin-film solar cells at that time. In recent years, the research directions of solar cells are high conversion efficiency, low cost and high stability. The area developed by Siemens is 3600cm 2 The conversion efficiency of cadmium telluride thin-film solar c...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved and the technical task proposed by the present invention are to improve the prior art, provide a cadmium telluride thin film solar cell, and solve the problems of low conversion efficiency and low performance of the cadmium telluride thin film solar cell in the current technology

Images