Organic binder for silver paste for back electrode of crystalline silicon photovoltaic cell and preparation method of organic binder

Abstract

The invention relates to an organic binder for silver paste for a back electrode of a crystalline silicon photovoltaic cell and a preparation method of the organic binder. The organic binder comprises components in percentage by mass as follows: 1%-10% of ethyl cellulose, 1%-5% of cellulose acetate butyrate, 50%-70% of diethylene glycol butylether acetate, 10%-40% of butyl carbitol, 1%-5% of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 0.1%-0.5% of castor oil derivatives and 0.1%-3% of tallow propylene diamine olein. The preparation method is as follows: butyl carbitol, diethylene glycol butylether acetate, ethyl cellulose, cellulose acetate butyrate, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate and hydrogenated castor oil derivatives are mixed uniformly, stirred evenly, cooled and filtered, and the organic binder is obtained. The back silver paste which is prepared from the organic binder and used for crystalline silicon photovoltaic cell has a good sedimentation resistance effect, good liquidity and excellent silk-screen printing performance.

Description

technical field [0001] The invention belongs to the field of electronic paste for crystalline silicon photovoltaic cells, and in particular relates to an organic binder for silver paste on the back electrode of crystalline silicon photovoltaic cells and a preparation method thereof Background technique [0002] A crystalline silicon photovoltaic cell is a semiconductor device that can convert solar energy into electrical energy. Under the condition of light, a photogenerated current will be generated inside the solar cell, and the electrical energy can be output through the electrodes. In the manufacturing process of forming solar cells, the aluminum paste of crystalline silicon photovoltaic cells mainly acts as an aluminum back field in the field of solar cells. The aluminum paste is usually screen-printed on the back of the silicon wafer and dried. After drying, the silicon wafer is sintered to form an Al-Si melt. The back silver paste of crystalline silicon photovoltaic ...

AI Technical Summary

Problems solved by technology

It can be seen that the use of phthalates in the organic carrier of solar cell paste will not only cause environmental pollution, but also endanger the health of people who are directly or indirectly exposed to it.

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