Preparation method of back electric-field silver paste of crystalline-silicon solar battery

Abstract

The invention relates to a preparation method of back electric-field silver paste of a crystalline-silicon solar battery. The preparation method comprises the following steps of: (A) preparing a lead-free glass binder: weighing raw materials according to the composition and mass percent thereof; mixing the weighed raw materials, then heating, controlling the temperature between 900-1200 DEG C, maintaining the insulating time for 30-60 minutes, then quenching with deionized water, ball-grinding to be 0.5-2mum, and sieving with 200-400 meshes; (B) preparing an organic adhesive: taking ethyecellulose, epoxy resin and liquid paraffin, then adding a solvent, heating to be 70-120 DEG C, and fully stirring till completely dissolving; and (C) taking glass powder obtained in the step A, ultrafine silver powder, the organic adhesive and a diluent for stirring uniformly, and grinding till the average particle diameter is 0.2-1mum. The invention provides environment-friendly back electric-field silver paste of the crystalline-silicon solar battery, which can replace the traditional lead-containing silver paste and meet the requirement of environmental protection.

Description

technical field [0001] The invention relates to a method for preparing a back electric field silver paste of a crystalline silicon solar cell. Background technique [0002] Solar photovoltaic power generation technology, as the most significant technology in the utilization of solar energy, has become a hotspot in the research and application of countries all over the world. In the past 10 years, it has been increasing at an average annual rate of 30%, and in the last 3 years, it has grown at a rate of more than 50% per year. Solar photovoltaic power generation has become the fastest and largest industry in the field of renewable energy after wind power generation. At present, solar cells in photovoltaic power generation are still dominated by crystalline silicon solar cells, which are thriving, with a market share of 90%, and the efficiency of large-area commercialized solar cells can reach 18-19%. Next is the rapid development of amorphous silicon thin film solar cells, ...

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Problems solved by technology

The environmental standards of the electronic paste industry follow the European Union's RoHS directive (excluding Pb, Cd, Hg, Cr(VI), polybrominated biphenyl PBB, polybrominated diphenyl ether PBDE) and the European Union's RoHS directive on phthalates 2005 / 84 / EC , crystalline silicon solar cell back-field silver paste is currently used in more than 150 tons annually in China, and with the explosive growth of the photovoltaic industry, the existing lead-containing back-field silver paste has become more and more polluting to the environment. Its use will gradually be restricted

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