A kind of all-aluminum back field back silver paste and its preparation method and application

Abstract

The invention discloses an all-aluminum back-field silver paste and its preparation method and application. The all-aluminum back-field back silver paste includes the following parts by weight: 10-80% silver powder with a purity greater than 99.99% 0.5 to 5 parts of self-made lead-free main glass powder, 0 to 3 parts of low melting point auxiliary glass powder, 1 to 50 parts of low melting point metal powder for special requirements, 15 to 50 parts of organic binder, 0.01 to 0.01 parts of organic additive 1 serving. The all-aluminum back field back silver paste can be directly printed on the aluminum back field paste, and ensure that it has considerable welding tension and aging tension, avoiding serious leakage problems caused by metal defects caused by direct contact between silver and silicon wafers, thereby Improve the photoelectric conversion efficiency of crystalline silicon cells, and can adjust the width of the back electrode and print graphics at will, thereby reducing the cost of back electrode paste.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to an all-aluminum back field back silver paste and a preparation method and application thereof. Background technique [0002] The conventional back silver paste is directly printed on the surface of the silicon wafer, and then the back aluminum is printed in parallel, and the electrode, the back aluminum and the silicon wafer form ohmic contact through sintering. This kind of battery has the following defects, mainly that the back electrode is directly printed on the silicon wafer to form an ohmic contact, and the silver electrode is easy to form metal defects in the silicon wafer, making the electrode a serious leakage area and reducing the photoelectric conversion efficiency of the solar cell ( 0.1-0.2%); the edge of the back electrode needs to be covered by the aluminum back field, which increases the width of the back electrode and increases the cost of the bac...

AI Technical Summary

Problems solved by technology

This kind of battery has the following defects, mainly that the back electrode is directly printed on the silicon wafer to form an ohmic contact, and the silver electrode is easy to form metal defects in the silicon wafer, making the electrode a serious leakage area and reducing the photoelectric conversion efficiency of the solar cell ( 0.1~0.2%); the edge of the back electrode needs to be covered by the aluminum back field, which increases the width of the back electrode and increases the cost of the back electrode paste

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