Deposition method of multi-section camium sulfide thin film

Abstract

The invention relates to a deposition method of a multi-section camium sulfide thin film, at least comprising the following steps of: placing a substrate containing a high-absorbing layer in a chemical bath with the contents of first sulfide ions and first cadmium ions for depositing a first camium sulfide layer on the light-absorbing layer of the substrate; and placing the substrate in another chemical bath with the contents of second sulfide ions and second cadmium ions for depositing a second camium sulfide layer on the first camium sulfide film so that the concentration ratio different between concentration ratio of the first sulfide ions to the first cadmium ions and the concentration ratio of the second sulfide ions to the second cadmium ions is above 10.

Description

technical field [0001] The invention relates to a cadmium sulfide film deposition method, in particular to a multi-stage cadmium sulfide film deposition method. Background technique [0002] In recent years, with the rise of international oil prices and the rise of environmental protection awareness, green energy has become the mainstream of new energy. Among them, solar cells are obtained from the stable radiation energy of the sun, and the source will not be exhausted. R&D funds and policy subsidies are used to support the local solar cell industry, making the global solar industry develop very rapidly. [0003] The first generation of solar modules includes monocrystalline silicon and polycrystalline silicon solar modules. Although the photoelectric conversion efficiency is high and the mass production technology is mature, due to the high cost of materials and the lack of supply of silicon wafers due to the needs of the semiconductor industry, subsequent quantities are a...

AI Technical Summary

Problems solved by technology

[0006] In the existing conventional technology, a layer of cadmium sulfide with a film thickness of about 30-100 nm is plated on the CIGS or CIGS (sulfur) light absorbing layer. If the coating is too thick, the resistance will be too high and the efficiency of the solar cell will be reduced. At the same time, it will cause a decrease in light transmittance, which will affect the light absorption of the light-absorbing layer. If the coating is too thin, it will easily cause uneven coverage and large differences in the coverage of each layer. Therefore, a multi-stage cadmium sulfide deposition method is proposed. Improve the above shortcomings

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