Crystal silicon solar cell high adhesive force back surface field aluminum electrocondution slurry and preparation method

Abstract

The invention discloses crystal silicon solar cell high adhesive force back surface field aluminum electrocondution slurry which comprises 68%-80% of aluminite powder, 1%-6% of glass powder, 16%-25% of organic bond and 1%-3% of auxiliaries. The auxiliaries are composed of 60% of wetting dispersant and 40% of diffusion pump oil. The aluminum electrocondution slurry is printed on the back surface of a crystal silicon solar cell piece. Aluminium-silicon alloy reaction is performed on aluminum and substrate silicon through infrared quick calcining technology. A preparation method for the aluminum electrocondution slurry comprises the following steps that the aluminite powder, the glass powder, the organic bond and the auxiliaries are put in a vacuum mixer to be mixed, and dispersed by a three-high mill to obtain aluminum electrocondution slurry with less than or equal to 15Mum of precision and 20-40 Pa.s viscosity. The aluminum electrocondution slurry is good in property, and suitable for the use of a crystal silicon solar cell back surface field. A calcined aluminum film and a silicon substrate have good adhesive force and water resistence, aluminium pills and aluminium blisters do not exist, the calcined cell piece is small in bending, and the conversion efficiency is higher.

Description

technical field [0001] The invention belongs to the field of new materials for solar cells, in particular to a high-adhesion back-field aluminum conductive paste for crystalline silicon solar cells and a preparation method thereof. Background technique [0002] Crystalline silicon solar cell is a semi-permanent physical battery that converts sunlight energy into electrical energy. With the extreme consumption of fossil (petroleum, coal, natural gas, etc.) The demand for clean energy is becoming more and more urgent. For a long time in the future, the sun will be an effective provider of clean energy for human beings. At present, crystalline silicon solar cells are one of the effective devices for converting solar energy into civil energy. Its application range is expanding from aerospace and military to people's daily life. Life, while not generating new pollution, the reduction in cost will make solar cells more widely used. [0003] According to the forecast of the Inter...

AI Technical Summary

Problems solved by technology

In the current manufacturing process of crystalline silicon solar cells, the aluminum conductive paste is printed on almost the entire backlight surface of the cell. -7 / °C, 20~300°C) and silicon (expansion coefficient is 26×10 -7 / °C, 20~300°C), the difference in thermal expansion coefficient causes the aluminum conductive paste to generate stress in the silicon wafer during sintering, causing the silicon wafer to bend, which directly affects the yield of solar cells and the subsequent component process

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