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Method for texturing surface of monocrystalline silicon solar battery

A solar cell and surface texture technology, applied in chemical instruments and methods, crystal growth, sustainable manufacturing/processing, etc., can solve the problems of large thickness of single crystal silicon, increased production cost, difficult to control, etc., and achieve low cost , The effect of reducing the corrosion rate and low cost

Active Publication Date: 2011-08-31
CECEP SOLAR ENERGY TECH (ZHENJIANG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the above-mentioned etching solution, the thickness of monocrystalline silicon etched is too large, which is difficult to control, and the thickness is getting thinner and more fragile, which further increases the production cost.

Method used

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  • Method for texturing surface of monocrystalline silicon solar battery
  • Method for texturing surface of monocrystalline silicon solar battery
  • Method for texturing surface of monocrystalline silicon solar battery

Examples

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Effect test

Embodiment 1

[0022] Example 1: Prepare a mixed solution of 0.01% detergent spirit and 0.1% sodium hydroxide in an ultrasonic tank, heat the mixed solution to 90° C., and ultrasonically clean the single crystal silicon wafer for 2.5 minutes. After rinsing, spray G solution evenly on the surface of the monocrystalline silicon wafer, and prepare an alkaline etching solution in a constant temperature bath: 1.5% sodium hydroxide by mass, 1.5% isopropanol by volume, and 0.5% by volume % concentration is 1 x 10 -3 mol / L alkylsulfonate aqueous solution, the reaction temperature is 75°C, and the corrosion time is 18min. The monocrystalline silicon that can obtain like this has pyramid suede, has formed uniform pyramid suede on the surface of this single crystal silicon under the scanning electron microscope, and the side length of pyramid is about 2 μ m, and corrosion thickness is 12 μ m (such as figure 1 shown).

Embodiment 2

[0023] Example 2: Prepare a solution of 0.015% detergent spirit and 0.15% sodium hydroxide solution in an ultrasonic tank, and heat the mixed solution to 85° C., and ultrasonically clean the single crystal silicon wafer for 4 minutes. After rinsing, spray G solution evenly on the surface of the single crystal silicon wafer, and prepare an alkaline etching solution in a constant temperature tank: 1% sodium hydroxide by mass, 1% isopropanol by volume, and 0.3% by volume The concentration is 1×10 -3 mol / L alkylsulfonate aqueous solution, the reaction temperature is 80°C, and the corrosion time is 15min. The monocrystalline silicon that can obtain like this has pyramid suede, has formed uniform pyramid suede on the surface of monocrystalline silicon under the scanning electron microscope, and the side length of pyramid is about 1.5 μ m, and corrosion thickness is 10 μ m (such as figure 2 shown).

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Abstract

The invention relates to a method for texturing the surface of a monocrystalline silicon solar battery, which comprises the following steps of: (1) preparing, in an ultrasonic tank, a mixed solution consisting of detergent with the concentration of 0.005% to 0.015% and sodium hydroxide with the concentration of 0.015% to 0.2%, heating the mixed solution to the constant temperature of 80 to 90 DEG C, and ultrasonically cleaning a monocrystalline silicon wafer within the constant temperature interval for 1-5min; (2) after the monocrystalline silicon wafer is cleaned, uniformly spraying a solution G on the surface of the monocrystalline silicon wafer, wherein the solution G contains 1% to 5% of sodium salt, 0.01% to 0.05% of carbamide and 0.0015% to 0.01% of lactic acid in percentage by mass; (3) preparing alkaline corrosive liquid in the constant temperature ultrasonic tank, and putting the monocrystalline silicon wafer in the alkaline corrosive liquid for being corroded, wherein the scope of reaction temperature is from 70 to 85 DEG C and the corrosion time is from 10 to 25 minutes; and (4) flushing the monocrystalline silicon wafer after corrosion reaction, and drying the monocrystalline silicon wafer by drying to complete the texturing on the surface of the monocrystalline silicon wafer. The method of the invention has low cost, is beneficial to absorption of solar energy, and can be widely applied to the filed of solar batteries.

Description

technical field [0001] The invention relates to a battery surface texturing method in the technical field of solar cells, in particular to a single crystal silicon solar cell surface texturing method. Background technique [0002] Low-cost, high-efficiency solar cells have always been the focus of people's pursuit. Currently, surface texturing of monocrystalline silicon solar cells is one of the effective means to improve the conversion efficiency of solar cells. Usually, the main method of texturing is the alkali etching method. The alkali etching method is to add various buffers, such as isopropanol, ethanol, sodium silicate, etc., to the alkali etching solution to control the reaction rate, so as to obtain For the suede surface with pyramid shape, the smaller and more uniform the size of the pyramid shape, the stronger the light absorption ability of monocrystalline silicon, and the higher the conversion efficiency of solar cells. At present, isopropanol is mainly used a...

Claims

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Application Information

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IPC IPC(8): C30B33/10
CPCY02P70/50
Inventor 勾宪芳姜利凯王鹏
Owner CECEP SOLAR ENERGY TECH (ZHENJIANG) CO LTD
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