Quartz boat for diffusion

Abstract

The invention relates to the technical field of production of solar cells, in particular to a quartz boat for diffusion. The quartz boat for diffusion comprises a side connecting piece and brackets, wherein the brackets comprise a pair of upper brackets and a pair of lower brackets; the pair of upper brackets is symmetrically fixed on the inner side walls at the upper end of the side connecting piece; the pair of lower brackets is symmetrically fixed on the inner side walls at the bottom of the side connecting piece; a plane where the pair of upper brackets is arranged on is mutually parallel to that where the pair of lower brackets is arranged on; the distance between the pair of upper brackets is longer than that between the pair of lower brackets; and grooves at different intervals are formed in the inner side surfaces of the pair of upper brackets and the upper side surfaces of the pair of lower brackets. Through the adoption of the quartz boat for diffusion, the open-circuit voltage and the short-circuit current of the solar cells can be improved, the conversion efficiency is further improved, the square resistance of the cells can be controlled easily, the uniformity is enhanced, the method is feasible, and the operation is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of a solar cell production section fixture, in particular to a diffusion quartz boat. Background technique [0002] The manufacturing process of crystalline silicon solar cells includes steps such as texturing, diffusion, etching, deposition of anti-reflection film, and printing electrodes. The diffusion step generally uses a quartz boat as a carrying tool, such as patent: 200920068241.4. [0003] In the prior art, in the process of making the PN junction of solar cells, the grooves are generally used to distribute the quartz boats evenly on the bracket at the same interval, and the diffusion surface of two silicon wafers is used to insert the grooves together when the diffusion is inserted. A method of performing one-sided diffusion. In this way, on the one hand, the high-temperature gettering effect of phosphorus diffusion is weakened because the non-diffusion surface cannot obtain enough phosphorus sourc...

AI Technical Summary

Problems solved by technology

In this way, on the one hand, the high-temperature gettering effect of phosphorus diffusion is weakened because the non-diffusion surface cannot obtain enough phosphorus source; on the other hand, the controllability and uniformity of the sheet resistance of the cell are poor, thereby reducing the conversion efficiency of the solar cell

At the same time, due to the back-to-back insertion, the probability of silicon chip fragmentation will be increased to a certain extent, and the qualified rate of the product will be reduced.

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