Method for ohmic contact between copper indium gallium diselenide and molybdenum and solar cell preparation method

Abstract

The invention discloses a method for ohmic contact between copper indium gallium diselenide and molybdenum and a solar cell preparation method. After a CIGS thin film is formed on a Mo thin film, power voltage is applied between the CIGS thin film and the Mo thin film, a scanning assembly carries out two-dimensional scanning on the surface of the CIGS thin film, the contact-potential barrier between the Mo thin film and the CIGS thin film is broken through, internal resistance of the thin-film solar cell is reduced, and conditions are created for improving efficiency of the solar cell. According to the method for ohmic contact between copper indium gallium diselenide and molybdenum and the solar cell preparation method, through the voltage application mode, additional processing on the surface of the Mo thin film can be reduced, the number of procedures is reduced, uncontrollability caused by additional technologies is avoided, the implementation methods are quite simple, and input of subsequent industrial development is saved.

Description

technical field [0001] The invention relates to the preparation of thin-film solar cells, in particular to a method for changing the ohmic contact between copper indium gallium selenium and molybdenum and a method for preparing solar cells. Background technique [0002] Thin-film solar cells have become the main development direction of future batteries due to their low loss and high yield characteristics. Copper indium gallium selenide solar cells are one of the main development directions in thin film solar cells. Its structure includes from bottom to top: glass or flexible substrate, molybdenum Mo thin film, copper indium gallium selenide CIGS thin film, cadmium sulfide CdS thin film, zinc oxide ZnO thin film, aluminum-doped zinc oxide ZnO:Al thin film and surface electrode, among them, sulfide The contact resistance between the cadmium film to the zinc oxide film and between the zinc oxide film and the aluminum-doped zinc oxide film, because the material itself is well ...

AI Technical Summary

Problems solved by technology

However, even if a MoSe2 film is prepared on a Mo film, there may not be a good ohmic contact, and certain conditions need to be met, and this preparation method is complicated and difficult to control

Improper preparation process will increase the contact resistance between Mo thin film and CIGS thin film, which will increase the series resistance of CIGS cells and affect the performance of solar cells

Moreover, the additional process may damage the mechanical connection between the CIGS film and the Mo film, such as the phenomenon that the CIGS film falls off.

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