Front silver paste for silicon solar cell, manufacturing method of front silver paste, front electrode of silicon solar cell and silicon solar cell

Abstract

The invention provides front silver paste for a silicon solar cell and a preparation method thereof, a front electrode of the silicon solar cell and the silicon solar cell, the front silver paste comprises glass powder, an organic carrier, a degradation catalyst and silver powder, low-melting-point sediments and high-melting-point sediments are deposited on the silver powder in sequence, and the degradation catalyst is used for degrading the low-melting-point sediments and the high-melting-point sediments. Wherein the low-melting-point sediment is a substance with a melting point lower than that of silver, and the high-melting-point sediment is a substance with a melting point higher than that of silver; the glass powder is glass powder with a TeO2-PbO-Li2O main body structure; when the glass powder comprises W element oxide and / or Mo element oxide, the total addition amount of the W element oxide and / or Mo element oxide is 0-3% of the total molar weight of the glass powder; the degradation catalyst can catalyze the organic carrier to decompose in the sintering process of the front silver paste; the organic carrier contains a silicon-containing additive, and the silicon-containing additive comprises silicon dioxide and / or a substance which can be decomposed to obtain silicon dioxide when the front silver paste is sintered.

Description

technical field [0001] The invention relates to a front silver paste for silicon solar cells, a preparation method thereof, a front electrode of silicon solar cells, and silicon solar cells. Background technique [0002] In the related art, an anti-reflection film (mostly a silicon oxide coating) is provided on the silicon substrate of a silicon solar cell, a grid line pattern is provided on the anti-reflection film, and a front electrode formed by a front conductive silver paste is provided in the grid line pattern. . In the manufacturing process of silicon solar cells, the anti-reflection film is first plated on the silicon substrate by methods such as vapor deposition, and then the grid pattern is prepared by photolithography or laser penetration of the anti-reflection film. The silver paste is printed in the grid lines by screen printing, and the front conductive silver paste corrodes the anti-reflection film by sintering, so that the front conductive silver paste can b...

AI Technical Summary

Problems solved by technology

In order to overcome this shortcoming, it is generally believed in the related art that as long as W and / or Mo and other element oxides with a total molar content of 5% to 15% are introduced into this type of glass powder, W and Mo and other elements can be compared with TeO. 2 Weak oxidizing properties to prevent the occurrence of over-burning problems, and at the same time, improve the Li 2 O content used, reduce TeO 2 The use content of PbO and PbO can increase the melting temperature of the glass frit, ensure the fusing effect of the glass frit, and keep the low contact resistance between the front electrode and the silicon substrate

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