Monocrystalline silicon battery and its preparation method

Abstract

The invention relates to the field of solar cells, and provides a single crystal silicon cell and a preparation method thereof. The preparation method comprises the following steps: sequentially adopting a texturing process, a diffusion process and an etching process to treat the silicon substrate; depositing SiO on the front side of the silicon substrate 2 1. Coating the back side to obtain a processed silicon substrate; using a mask method to selectively sputter silver on the first predetermined area on the front side of the processed silicon substrate to form sputtering pits deposited with a silver-silicon doped layer ; remove the mask on the front side of the processed silicon substrate; carry out screen printing on the silver-silicon doped layer to form silver electrode grid lines; use mask method to selectively remove the first preset on the front side of the processed silicon substrate A SiNx layer is deposited in areas other than the area; and the processed silicon substrate deposited with the SiNx layer is sintered. The invention avoids the problem of large carrier recombination caused by the direct contact between the silver electrode grid line and the silicon substrate, and improves the open-circuit voltage, short-circuit current and photoelectric conversion efficiency of the monocrystalline silicon battery.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a single crystal silicon cell and a preparation method thereof. Background technique [0002] Monocrystalline silicon is a non-metallic element and is a good semiconductor material. Single crystal silicon has a crystal with a basically complete lattice structure, different directions have different properties, and its purity can reach 99.9999%, or even more than 99.9999999%. Doping a small amount of group IIIA elements into single crystal silicon forms a P-type semiconductor, and doping a small amount of group VA elements forms an N-type semiconductor. The combination of N-type and P-type semiconductors can make a solar cell, which can radiate energy converted into electricity. The efficiency improvement of solar cells has always been a research hotspot in the energy industry, and reducing optical loss and carrier recombination is an effective way to improve the photoelectric convers...

AI Technical Summary

Problems solved by technology

However, at the contact between the silver electrode grid line and the silicon substrate, the carrier recombination is relatively large, which affects the photoelectric conversion efficiency of the single crystal silicon cell.

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