A kind of solar cell and preparation method thereof

Abstract

The present application provides a solar cell and a preparation method thereof. According to the preparation method of the solar cell, plasmas are adopted to treat ammonia gas, so that hydrogen passivation can be performed on a silicon substrate; hydrogen ions generated by the ammonia gas in a plasma treatment process react with defects or impurities in the silicon substrate of the solar cell, so that a passivation effect can be realized, and therefore, the photoelectric conversion efficiency of the solar cell can be improved; and the ammonia gas is a non-flammable and explosive gas, and therefore, the possibility of risks caused by the participation of total flammable and explosive gases in the hydrogen passivation process can be avoided.

Description

technical field [0001] The present application relates to the field of new energy technologies, and more specifically, relates to a solar cell and a preparation method thereof. Background technique [0002] With the continuous development of society, the shortage of resources has become increasingly prominent, and the utilization of new energy is imminent. As a renewable clean energy source, solar energy has received widespread attention, and solar cells have emerged as the times require. [0003] The mainstream solar cells are generally silicon-based solar cells. Because the silicon materials used to prepare silicon-based solar cells inevitably contain a large number of impurities and defects, the minority carrier lifetime and diffusion length in silicon materials are greatly reduced, thereby affecting the conversion efficiency of solar cells. . In order to reduce the number of impurities and defects in silicon materials to improve the photoelectric conversion efficiency ...

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Problems solved by technology

[0004] The hydrogen passivation technology in the prior art is usually annealing the silicon base in a mixed gas of nitrogen and hydrogen at about 450°C for a certain period of time before forming the front and back electrodes of the solar cell, so that the hydrogen ions and silicon Defects or impurities in the substrate react to play a passivation effect, thereby improving the conversion efficiency of solar cells. However, due to the flammability and explosion of hydrogen, there is a certain risk in the hydrogen passivation process of solar cells in the prior art.

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