Preparation method of cadmium sulfide layer of copper-indium-gallium-selenium solar cell, solar cell and method for growing cadmium sulfide layer on copper-indium-gallium-selenium layer

Abstract

The invention relates to a preparation method of a cadmium sulfide layer of a copper-indium-gallium-selenium solar cell, the solar cell and a method for growing the cadmium sulfide layer on the copper-indium-gallium-selenium layer. The preparation method of the cadmium sulfide layer of the copper-indium-gallium-selenium solar cell comprises the steps of placing a substrate with a preset copper-indium-gallium-selenium layer in a potassium tartrate solution to be soaked so as to diffuse at least part of potassium ions in the potassium tartrate solution into the copper-indium-gallium-selenium layer; adding cadmium salt and alkali into the potassium tartrate solution and fully mixing to obtain a mixed solution, wherein the mixed solution contains a complex of tartaric acid and cadmium; heatingthe mixed solution to diffuse the cadmium ions in the complex into the copper-indium-gallium-selenium layer and enable the surface of the copper-indium-gallium-selenium layer to contain at least partof cadmium ions; and adding thiourea into the mixed solution, fully reacting, and growing the cadmium sulfide layer on the copper-indium-gallium-selenium layer. According to the present invention, the ammonia water in the prior art is replaced with potassium tartrate, so that the quality and stability of the cadmium sulfide layer prepared from potassium tartrate are greatly improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing a cadmium sulfide layer of a copper indium gallium selenide solar cell, a solar cell and a method for growing a cadmium sulfide layer on the copper indium gallium selenide layer. Background technique [0002] Copper indium gallium selenide thin-film solar cells have attracted widespread attention due to their high photoelectric conversion efficiency, less material consumption, light weight, and flexibility, and are considered to be the second-generation solar cells with great commercial prospects. Generally speaking, a thin-film solar cell includes a substrate, a back electrode, a copper indium gallium selenide absorber layer, a cadmium sulfide layer, and an upper electrode from bottom to top. The cadmium sulfide layer mainly plays the role of adjusting the lattice matching between the absorbing layer and the window layer, protecting the absorbing layer...

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Problems solved by technology

Moreover, in the process of preparing the cadmium sulfide film, it is inevitable that ammonia molecules will be adsorbed on the surface of the cadmium sulfide film, which will easily cause pinholes, which may lead to short circuit of the battery.

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