PERC cell processing technology capable of reducing back surface field recombination loss

Abstract

The invention is suitable for the technical field of solar cell processing, and provides a PERC cell processing technology capable of reducing back field recombination loss. The technology comprises the steps of texturing, diffusion, etching, annealing, passive film deposition on the back surface, anti-reflection film deposition on the front surface, back surface laser grooving, silk-screen printing and sintering. Between the step of back surface laser grooving and the step of silk-screen printing, the method also comprises the following steps: back surface alkali polishing: polishing the back surface of the silicon wafer by using an alkali solution, and cleaning and drying the silicon wafer. According to the PERC cell processing technology capable of reducing the back field recombination loss provided by the invention, a back alkali polishing technology is added, a damaged layer formed by ablation during laser grooving on the back of the silicon wafer can be removed by using an alkali solution, and recombination of carriers by the damaged layer of the silicon wafer is reduced, so that the back field recombination loss of the PERC cell is reduced, the open-circuit voltage and the short-circuit current of the PERC battery can be improved, and the conversion efficiency of the PERC battery manufactured by the process can be improved by 0.03-0.06%.

Description

technical field [0001] The invention relates to the technical field of solar cell processing, in particular to a PERC cell processing technology for reducing back field recombination loss. Background technique [0002] With the development of crystalline silicon solar cell technology, the reliability of crystalline silicon solar cells has attracted more and more attention. As the mainstream product of crystalline silicon solar cells, PERC cells can greatly reduce the back recombination loss of solar cells due to its back passivation effect, increase the open circuit voltage of solar cells, and significantly improve the efficiency of solar cells. At present, the manufacturing process of PERC cells is mainly: texturing-diffusion-etching-annealing-deposition of passivation film on the back side-deposition of anti-reflection film on the front side-laser slotting on the back side-screen printing-sintering, in order to improve the market competition of PERC cells Therefore, it is...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a PERC battery processing technology that reduces the back field recombination loss, and aims to solve the problem in the prior art that a damaged layer will be formed on the silicon wafer during laser grooving on the back side of the PERC battery processing process, which will easily lead to carrier recombination. This will reduce the problem of battery conversion efficiency

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