Preparation method of double-sided PERC battery

Abstract

The invention provides a preparation method of a double-sided PERC battery, and the method comprises the steps of film coating, slotting, printing and sintering in sequence; the sintering step comprises a drying stage, a first heating stage, a second heating stage and a third heating stage; the initial temperature of the second heating stage is 480-520 DEG C, the final temperature of the second heating stage is 550-580 DEG C, and the heating rate of the second heating stage is set to be 7-25 DEG C/s. According to the preparation method provided by the invention, a relatively slow temperature rise interval is arranged, so the formation of an aluminum back surface field BSF is facilitated, the aluminum burning reaction time is reasonably shortened, the erosion of back electrode aluminum paste is reduced, and the open-circuit voltage and the conversion efficiency of the double-sided PERC battery are improved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic production, in particular to a preparation method of a double-sided PERC battery. Background technique [0002] Solar energy is a clean and sustainable energy source with great potential. In recent years, the number of photovoltaic power stations invested and operated at home and abroad has increased year by year. With the rapid development of photovoltaic technology, the market has become increasingly concerned about the performance and conversion efficiency of solar cells and components. put forward higher requirements. Among them, the PERC (Passivated Emitter and Rear Cell) battery can greatly reduce the recombination speed of the back surface by setting a passivation film on the back surface. It is a high-efficiency battery that is widely concerned in the industry. [0003] Generally, the passivation film on the back of the PERC cell can be made of aluminum oxide or silicon oxide film, a...

AI Technical Summary

Problems solved by technology

However, the double-sided PERC cell due to SiN x The thickness of the film is reduced, and the above-mentioned "burning aluminum platform" will cause part of the paste to burn through SiN x Thin film, destroys the passivation film, and then affects the opening voltage and conversion efficiency of the battery

According to field tests, compared with single-sided PERC cells, the opening voltage Voc of double-sided PERC cells will drop by about 2mV, and the front-side conversion efficiency will also drop by about 0.1%.

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