Sintering method for reducing light degradation of P-type solar cell and application thereof

Abstract

The invention relates to a sintering method for reducing light degradation of P-type solar cell and application thereof, and belongs to the technical field of solar cells. The method comprises the steps of: drying and sintering a screen-printed cell piece, after a sintering peak temperature is rapidly reached, performing cooling sintering at a cooling rate of 5-40K / s, and finally performing cooling. The method prolongs the cooling time of the sintering process, reduces the cooling rate of the sintering process and reduces the defect number in the crystalline silicon material so as to reduce the light decay amplitude. The efficiency attenuation rate of the silicon solar cell is reduced to about 2.2% from a conventional about 6.5% after light attenuation processing of 800W / m2 at the temperature of 70 DEG C for 45h, so that the efficiency attenuation rate can be greatly reduced while ensuring that the conversion efficiency cannot be reduced, production processes are not added, the implementation is easy, and the sintering method for reducing light degradation of P-type solar cell and application thereof are suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of solar cells, and in particular to a sintering method and application for reducing light-induced attenuation of P-type solar cells. Background technique [0002] The problem of light-induced attenuation of P-type crystalline silicon solar cells has always been the focus of research in the industry. It was first discovered by Fischer et al. in 1973; then Schmidt et al. proposed that solar cells will form a substituting boron atom and two B s o 2i Complex, B s o 2i The appearance of the complex leads to the recombination of minority carriers, thereby attenuating the battery; in 1989, Kimerling et al. believed that light would decompose the B-Fe pair, and the pollution of Fe would also lead to the attenuation of battery performance; in 2012, Ramspeck et al. A new light attenuation phenomenon was found on the battery. This attenuation method is highly dependent on temperature and neither the B-O complex de...

AI Technical Summary

Problems solved by technology

[0002] The problem of light-induced attenuation of P-type crystalline silicon solar cells has always been the focus of research in the industry. It was first discovered by Fischer et al. in 1973; then Schmidt et al. proposed that solar cells will form a substitutional boron atom and two B formed by interstitial oxygen atoms s o 2i Complex, B s o 2i The appearance of the complex leads to the recombination of minority carriers, thereby attenuating the battery; in 1989, Kimerling et al. believed that light would decompose the B-Fe pair, and the pollution of Fe would also lead to the attenuation of battery performance; in 2012, Ramspeck et al. A new light attenuation phenomenon was found on the battery. This attenuation mode is highly dependent on temperature and neither the B-O complex defect nor the B-Fe pair decomposition attenuation mechanism can explain the attenuation phenomenon well. The attenuation mechanism is currently being investigated. researching

However, on the other hand, the problem of large light attenuation of polycrystalline PERC cells has not been well resolved, which also restricts the development prospects of PERC technology.

However, because these methods are limited by technology or cost, large-scale industrialization has not been achieved.

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