Cadmium telluride film solar cell and preparation method thereof

Abstract

The invention discloses a cadmium telluride film solar cell and a preparation method thereof. A structure of the cadmium telluride film solar cell is that the cell comprises a substrate with a conducting layer, and the substrate is sequentially deposited with a cadmium sulfide layer, a cadmium telluride layer, a tellurium-rich layer, a back contact layer and a back electrode. According to the method, a treated low-toxicity compound cadmium is adopted as a cadmium source, and treated tellurium or telluride is adopted as a tellurium source to prepare the cadmium telluride film solar cell; the cadmium source and the tellurium source undergo a chemical reaction in a certain molar ratio to prepare cadmium telluride particles with uniform particle size; and then the cadmium telluride particles are purified, cadmium telluride and a low boiling-point solvent containing polyvinylidene fluoride are mixed to obtain sol, and a cadmium telluride film is prepared by a coating method. The method prevents human bodies from contacting high-toxicity cadmium element and cadmium steam, and also avoids environmental pollution at the same time.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a cadmium telluride thin film solar cell and a preparation method thereof. Background technique [0002] With the rapid development of human beings, the demand for energy has increased rapidly, leading to the exhaustion of fossil fuel energy. The development of new energy is the only way, and the development of solar energy is the fundamental way for mankind to solve energy problems. Using solar power to generate electricity is one of the important directions of developing and utilizing solar energy, which is to use the photovoltaic effect of semiconductors to realize solar power generation. Chapin, Fuller and Pearson used this principle to make the first solar cell in 1954 using diffused silicon p-n junction technology. Since then, many scientific researchers have made unremitting efforts to develop solar photovoltaic devices such as monocrystalline silicon, polycrystalline silicon, ...

AI Technical Summary

Problems solved by technology

The disadvantage is that the amount of toxic cadmium is large, and once the elemental cadmium, cadmium ions and cadmium vapor leak during the preparation of the film, it will cause great harm to the environment and people.

At present, methods such as physical vapor deposition, chemical vapor deposition, vacuum sublimation, and magnetron sputtering are mostly used to prepare cadmium telluride thin films. The use of these methods for cadmium target or vacuum evaporation will bring huge potential hazards to operators and cause environmental pollution at the same time.

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