Method for sintering solar battery cell

Abstract

The embodiment of the invention discloses a method for sintering a solar battery cell, comprising the following steps of: screening out a batter cell with larger series resistance in the solar battery cells after being sintered through a silk screen; and sintering the screened battery cell again in order to decrease series resistance of the screened battery cell, wherein the temperature of the secondary sintering is lower than normal sintering temperature. In the method provided by the embodiment of the invention, by screening out the batter cell with the larger series resistance and sintering the screened battery cell again, the defects of the screened battery cell are the sintering defects of the battery cell caused by the disturbance of gas atmosphere in a sintering furnace in the sintering process, the sintering defects also cause low conversion efficiency, the screened battery cell is sintered again at the temperature lower than the normal sintering temperature, and a smooth and uniformly distributed Al-Si alloy layer can be arranged on the surface of a back surface filed in order to compensate for local or large-scale sintering shortage of the back surface field in normal sintering process; therefore, the series resistance of the battery cell is decreased, the conversion efficiency of a crystalline silicon solar battery cell, and the economic benefit is improved.

Description

Technical field [0001] The invention relates to the production and processing of solar cells, and more specifically to a method for sintering solar cells. Background technique [0002] Solar cells, also called photovoltaic cells, are semiconductor devices that directly convert the light energy of the sun into electrical energy. Because it is a green and environmentally friendly product, it will not cause environmental pollution, and it is a renewable resource, so in today's energy shortage situation, solar cells are a new type of energy with broad development prospects. Currently, more than 80% of solar cells are made of crystalline silicon (monocrystalline silicon and polycrystalline silicon) materials. Therefore, the preparation of high-efficiency crystalline silicon solar cells is of great significance for large-scale utilization of solar power. [0003] At present, crystalline silicon solar cells have been standardized, and the main steps are as follows: [0004] Step S11, chem...

AI Technical Summary

Problems solved by technology

[0010] In the actual production process, it is found that a certain proportion of cells with a large series resistance Rs often appear in the cells produced by the above method, see figure 2 , is the equivalent circuit of the solar cell. It can be seen from the figure that the internal resistance of the solar cell is composed of the series resistance Rs and the parallel resistance Rsh. voltage, resulting in the actual output voltage V becoming smaller, thus affecting the final conversion efficiency of the cell

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