A process for surface texturing of crystalline silicon solar cells

Abstract

The invention discloses a surface texturing technology for a crystalline silicon solar cell. The surface texturing technology for the crystalline silicon solar cell comprises the following steps of (1), removing a mechanically damaged layer on the surface of a silicon chip through a sodium hydroxide solution with the concentration between 2 to 10 %; (2) mixing a silver nitrate solution with the concentration between 0.001 to 0.005 % and a hydrogen fluoride solution with the concentration between 0.2 to 1 % and depositing nano-silver particles from the mixed solution to the surface of the silicon chip; (3) mixing the hydrogen fluoride solution with the concentration between 10 to 15 % and a hydrogen peroxide solution with the concentration between 2 to 5 %, performing reaction between the mixed solution and the silicon chip with the nano-silver particles deposited and forming into holes in silicon chip positions around the nano-silver particles; (4) removing residual nano-silver particles inside the holes in the surface of the silicon chip through a dense nitric acid solution; (5) removing an oxide layer on the surface of the silicon layer through the hydrogen fluoride solution with the concentration between 5 to 10 %. The surface texturing technology for the crystalline silicon solar cell can reduce reflex losses and improve battery conversion efficiency.

Description

technical field [0001] The invention relates to the field of crystalline silicon solar cells, in particular to a process for surface texturing of crystalline silicon solar cells. Background technique [0002] With the ever-increasing demand and increasingly fierce supply competition in the photovoltaic industry, the development of high conversion efficiency, reliability, and low-cost solar cells has become an inevitable trend in the development of the industry. At present, the crystalline silicon solar energy industry has applied new structures such as PERL, SE, EWT, MWT, IBC, and HIT on the basis of the original p-type polysilicon, and new materials such as n-type monocrystalline silicon, microcrystalline silicon, and amorphous silicon. The conversion efficiency of solar cells has increased to more than 24%; however, the introduction of stringent requirements for raw materials and technological processes has resulted in rising battery costs, which has brought great pressure...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a crystalline silicon solar cell surface texturing process, which solves the problem that the traditional solar cell surface texturing process cannot reduce reflection loss, resulting in low battery conversion efficiency

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