Thin film structure of solar cell absorbing layer and manufacturing method thereof

Abstract

The invention provides a solar cell absorption layer thin film structure and a manufacturing method thereof. The thin film structure comprises three thin film layers arranged in an overlaid mode, wherein one thin film layer is a CuInSe2 thin film layer; one thin film layer is a CuInGaSe2 thin film layer or a CuInAlSe2 thin film layer or a CuInBSe2 thin film layer; and another thin film layer is a CuInS2 thin film layer or a CuInGaS2 thin film layer. The thin film structure can also be manufactured by arbitrary two of the three thin film layers in an overlaid mode. Compared with a GIGS solar cell absorption layer thin film structure with a single layer structure, the provided GIGS solar cell absorption layer thin film structure not only has an excellent energy gap width, but also avoids reduction of the absorption range of light, and greatly improves efficiency of a solar cell for absorbing solar energy.

Description

technical field [0001] The invention relates to a structure and a processing method of an absorption layer of a copper indium gallium selenium solar cell. Background technique [0002] Ordinary copper indium gallium selenide solar cell absorber film has a single-layer structure and only has a single energy gap width, so the solar cell made in this way has a small open circuit voltage and low cell efficiency. [0003] In order to fully absorb the energy of sunlight, some people thought of selecting compound semiconductor materials with different forbidden energy gap widths for stacking to form a high-efficiency tandem solar cell. [0004] In order to manufacture tandem solar cells, the prior art, such as the preparation method provided by the invention patent with the application number CN200910006531.0 and the invention title "Copper Indium Gallium Selenium Solar Cell, Its Absorbing Layer Film and the Preparation Method and Equipment of the Film" , the first step is to depo...

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Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a solar cell absorbing layer thin film structure to solve the problem that the light absorption range of the existing stacked solar cells decreases with the increase of the energy gap width

[0008] In view of the deficiencies in the prior art, the purpose of the present invention is also to provide a method for manufacturing a solar cell absorbing layer thin film structure, which solves the problem that the existing method cannot obtain a solar cell absorbing layer with a real laminated structure

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