Preparation method of high-efficiency crystalline silicon solar cell

Abstract

The invention discloses a preparation method of a high-efficiency crystalline silicon solar cell. The method includes steps of polishing, texturing, diffusion, paste printing, etching, cleaning, film plating, electrode printing, and sintering of a silicon chip. According to the preparation method, the blocking ink paste with high printing property, acidic etching resistance, sticking resistance, and easy cleaning is employed so that the efficiency for producing the selective emitter solar cells is improved, and the production cost is reduced; moreover, the employed acid etching solution is HF / HNO3 / H2O so that the square resistance can be substantially increased; and compared with the prior art, the technical process is reduced, the method can be well combined with conventional equipment, large-scale industrial production is realized, the precision is high, and the solar cells with the efficiency of more than 19.5% can be rapidly obtained.

Description

[0001] (1) Technical field [0002] The invention belongs to the technical field of solar cells, in particular to a preparation method of a selective emitter solar cell. [0003] (2) Background technology [0004] Crystalline silicon solar cells account for more than 85% of the world's industrialized and applied solar cells. Because of the advantages of high efficiency and low attenuation, crystalline silicon solar cells are widely used in building roofs and large-scale photovoltaic power plants. In China, due to the new policy that photovoltaics can be connected to the grid for power generation, more and more families will choose to install crystalline silicon solar cell modules on the roof for power generation. [0005] The efficiency of conventional crystalline silicon solar cells with P-type substrates is generally above 18%. Since crystalline silicon solar cells have a life cycle of up to 25 years in practical applications, their attenuation rate is a very important tech...

AI Technical Summary

Problems solved by technology

[0007] However, the existing selective emitter technology is relatively cumbersome, and the process stability is not enough, especially the preparation process of the selective diffusion layer is not perfect enough

The existing selective emitter solar cell preparation technology laser grooving process takes a long time and cannot meet the large-scale and high-speed production requirements

Secondly, the laser ablation process will also bring some pollution to the cell, and the processing efficiency of the cell is not high, and it is difficult to match the high-speed production of the production line.

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