A system for hydrogenation of selenium source in flexible cigs solar cells to enhance selenium reactivity

Abstract

The invention discloses a system for hydrogenating a selenium source of a flexible CIGS solar cell to enhance the reactivity of selenium, including a selenium source, a hydrogen storage tank, an automatic gas mixing device and a mixed gas output pipeline. Valves, hydrogen control valves and gas delivery pipelines, the selenium vapor outlet of the selenium source is connected to the inlet of the selenium vapor control valve, the hydrogen outlet of the hydrogen storage tank is connected to the inlet of the hydrogen control valve, and the outlet of the selenium vapor control valve is connected to the selenium vapor of the gas delivery pipeline The inlet and the outlet of the hydrogen control valve are connected to the hydrogen inlet of the gas delivery pipeline, the outlet of the gas delivery pipeline is connected to the inlet of the mixed gas output pipeline, and the selenium vapor control valve is linked with the hydrogen control valve. The invention can realize automatic and uniform mixing of selenium vapor and hydrogen gas, can effectively open cluster Se and generate a small amount of hydrogen selenide, increase reaction activity, and reduce film defects.

Description

technical field [0001] The invention relates to the technical field of production of copper indium gallium selenium thin film batteries, in particular to a system for enhancing the reactivity of selenium by hydrogenation of selenium sources of flexible CIGS solar cells. Background technique [0002] In the structure of preparing high-efficiency CIGS thin-film solar cells, the CIGS absorber layer prepared by co-evaporation is the core film layer of the entire cell. During the deposition process, the influence of the Se source on the film layer is the most significant. If there is a lack of Se in the film, the formation of selenium vacancy defects will cause the conductivity type of the film to change, from P-type to N-type, which will cause the entire battery Completely useless. The temperature of the Se vapor generated during the co-evaporation process is 200-300 ° C. Under this condition, the Se vapor exists in the form of atomic clusters, and the number of cluster atoms i...

AI Technical Summary

Problems solved by technology

During the deposition process, the influence of the Se source on the film layer is the most significant. If there is a lack of Se in the film, the formation of selenium vacancy defects will cause the conductivity type of the film to change, from P-type to N-type, which will cause the entire battery completely useless

The temperature of the Se vapor generated during the co-evaporation process is 200-300 ° C. Under this condition, the Se vapor exists in the form of atomic clusters, and the number of cluster atoms is more than 5, or even larger. This cluster Se is forming When covalently bonded, the reaction energy and chemical activity are low, and the quality of the resulting absorbing layer film is very poor, and it is prone to selenium vacancy defects

In the post-selenization method, hydrogen selenide is used as the selenium source, which has high reactivity, but it is toxic in itself, which is not conducive to the preservation and use of materials, and the risk is relatively high; the current co-evaporation uses Se source evaporation crucible: in the crucible Place the selenium source, wrap the heating wire or heating plate outside, and realize the generation and eruption of selenium vapor by electric heating

[0003] If hydrogen is simply mixed into the Se vapor produced by the co-evaporation process, the hydrogen cannot affect the atomic clusters of the Se vapor, and the quality of the absorbing layer film is limited. At the same time, due to the lack of a suitable mixing control system, the reaction of Se vapor and hydrogen will produce A large amount of hydrogen selenide, although hydrogen selenide can improve the reactivity, but a large amount of hydrogen selenide has high toxicity, flammable and explosive safety hazards, and is not suitable for industrial production

Images