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Production of polycrystalline silicon solar battery suede

A technology of solar cells and polysilicon, which is used in circuits, electrical components, and final product manufacturing. Effect

Inactive Publication Date: 2007-06-20
SHANGHAI SOLAR ENERGY S&T
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when acid solution is used for corrosion in large-scale production, since the acid solution is volatile, the ratio of the acid solution is constantly out of balance in the production process, and the solution must be added continuously, which not only brings trouble, but also cannot guarantee stable quality.

Method used

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  • Production of polycrystalline silicon solar battery suede

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A mixed aqueous solution of NaOH, sodium alkylsulfonate and EDAT is prepared, and the concentrations of NaOH, sodium alkylsulfonate and EDAT are 10%, 0.5% and 2% respectively. Immerse the polysilicon in the above solution at 85°C and etch for three minutes. The obtained suede surface has uniform facets, fuzzy grain boundaries between crystal grains, no obvious color difference between crystal grains, a thickness reduction of 25um, and a measured reflectance of 20.8%.

Embodiment 2

[0019] Prepare a mixed aqueous solution of 5% NaOH, 1% sodium alkylsulfonate and 2% EDAT. The polysilicon is immersed in this solution at 85°C and etched for five minutes. The obtained suede surface has uniform facets, fuzzy grain boundaries between crystal grains, no obvious color difference between crystal grains, a thinning of 20um, and a measured reflectance of 21.4%.

Embodiment 3

[0021] Prepare a mixed aqueous solution of 5% NaOH, 0.5% sodium alkylsulfonate and 2% EDAT. The polysilicon is immersed in this solution at 85°C and etched for three minutes. The obtained suede surface has uniform facets, fuzzy grain boundaries between crystal grains, no obvious color difference between crystal grains, a thinning of 15um, and a measured reflectance of 20.4%.

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Abstract

The invention is concerned with a kind of production method for the textured polysilicon solar cell. Input polysilicon into alkaline eroded solution and the solution is mixed liquor made up by NaOH, sodium alkyl sulfonate and EDAT. And the concentration of NaOH is 5-10%, the concentration of sodium alkyl sulfonate is 0.5-4%, and the concentration of EDAT is 2-10%, and the eroded temperature is 85 centigrade and the time is 2 to 10 minutes. The reflectivity of textured surface made by this method is less than the reflectivity of textured surface made by acid solution, and the grain boundary of each crystal is not clear so there is no photometric and colorimetric contrast formed by different crystal orientations when observed with naked eye. The method can remove the scathing layer with 10um-30um on the silicon and the concentration of the alkaline solution is sustaining to keep the steady quality of textured surface of polysilicon solar cell.

Description

technical field [0001] The invention relates to a technology for preparing a solar cell by using polycrystalline silicon, in particular to a method for preparing a textured surface of a polycrystalline silicon solar cell. Background technique [0002] A solar cell is a semiconductor device that can directly convert the sun's light energy into electrical energy. Because it does not need water, oil, gas, or fuel when it works, it can generate electricity as long as there is light. It can be called a contemporary clean and pollution-free renewable energy source. It is easy to install and maintain, and has a long service life. It can be unattended and doubled. Favored by people, it is a leader in new energy. In recent years, the application of solar energy has become more and more extensive all over the world, especially in the field of communication. Solar power supply systems are gradually replacing some traditional power supply equipment and are becoming more and more widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L21/306C23F1/40
CPCY02P70/50
Inventor 汪乐
Owner SHANGHAI SOLAR ENERGY S&T
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