A kind of solar cell back silver paste and preparation device thereof

Abstract

The invention provides a solar cell back silver slurry which can reduce the cost, and guarantee better conductivity of a silver layer and great adhesive force with a silicon substrate, and a preparing device thereof. The solar cell back silver slurry is composed of: 65%-75% of powdery mixed materials, 8%-10% of ethyecellulose, 8%-10% of butyl carbitol, 5%-8% of terpilenol, 2%-4% of thixotropic agents and remaining weight ratio of auxiliary agents, wherein the powdery mixed materials are the mixed materials of silver-coated copper powder and glass powder, and the weight ratio between the silver-coated copper powder and the glass powder is (7-12):1. The content of pure silver in the back silver slurry is only about 35%, which is much lower than the heavy silver content of present back silver slurry, so that the usage amount of silver powder is substantially reduced, the cost of the back silver slurry is greatly reduced, and the cost pressure caused by silver cost increase can be alleviated; in addition, greater adhesive force exists between a finally prepared silver layer and the silicon substrate, and the binding property, solderability and soldering resistance are greater. The solar cell back silver slurry and the preparing device thereof are suitable for popularization in the electronic material technical field.

Description

Technical field [0001] The invention relates to the technical field of electronic materials, in particular to a solar cell back silver paste and a preparation device thereof. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. The solar cell back silver paste is the main component of the solar cell electronic paste. It is mainly used to make the back main grid in the production of solar cells, which plays the role of converging and deriving the current collected by the aluminum back field. [0003] With the market competition, the price of photovoltaic modules continues to fall, causing the cost pressure of photovoltaic module manufacturers to increase. The reduction of material costs is one of the key points to reduce the manufacturing cost of photovoltaic modules. Back silver paste is the main component of solar cell electronic pastes. How to reduce the cost of back silver paste is very necessary as a component....

AI Technical Summary

Problems solved by technology

At present, in order to ensure the efficiency of the battery, the back silver paste used for solar cells mostly has a silver powder content of more than 80%, and even some back silver pastes use pure silver, although higher silver content can ensure higher conductivity , but the ensuing problem is that the solderability, solder resistance, and adhesion of the silver layer to the silicon substrate are poor. Moreover, the price of silver powder remains high at present, and the higher the content of silver powder in the back silver paste The higher the manufacturing cost of the silver paste, not only cannot reduce the production cost of the back silver paste, but even increase the cost of the back silver paste, which is not conducive to the development of the enterprise

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