Method for manufacturing solar cell

Abstract

The invention provides a method for manufacturing a solar cell, comprising the following steps of: 1, fusing metal silicon in a high-frequency electromagnetic inducing finery into fused silicon, and carrying out boron-removal from slagging, metal-removal by primary straight pull, continuous vacuum dephosphorization and secondary straight pull on the fused silicon to obtain refined solar-grade polycrystalline silicon above 6N; 2, putting the refined solar-grade polycrystalline silicon above 6N into powder preparation equipment, and preparing solar-grade polycrystalline silicon micro-nano powder; 3, placing the solar-grade polycrystalline silicon micro-nano powder into forming equipment and manufacturing the solar-grade polycrystalline silicon micro-nano powder into solar-grade polycrystalline silicon wafers; and 4, manufacturing the solar-grade polycrystalline silicon wafers into solar-grade polycrystal cells. Acids and alkalis are not used completely in the refining and production process from the metal silicon to the solar-grade polycrystalline silicon and the refining of the polycrystalline silicon, the preparation of the polycrystalline silicon micro-nano powder, the hot-forming and the manufacturing of the cells are combined in a production system. The manufacturing technology is low in investment and short in technological process.

Description

technical field [0001] The invention relates to a method for manufacturing a solar cell. Background technique [0002] Due to the worldwide energy shortage and the emphasis on environmental protection, some new and renewable energy sources have been continuously developed, and the proportion of the entire energy source will also increase, and solar energy is considered to be the most important energy in the 21st century. As an important new energy source, the production based on solar energy will be a sustainable development model. In my country's energy shortage and environmental protection problems are becoming more and more serious, it is particularly important to use solar energy at low cost and high efficiency. [0003] At present, about 90% of solar cell products are dominated by crystalline silicon cells, and the market share of polycrystalline silicon cells will far exceed that of monocrystalline silicon cells. High efficiency and low cost, so many scientific res...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned difficult problems in the prior art of manufacturing solar cells, and to provide a method of manufacturing directly from metal silicon to solar cells, Its production process does not involve acid and alkali treatment at all; and it is a solar cell manufacturing method that completely omits cumbersome processes such as polysilicon ingot casting, square breaking, and wire cutting.