Method for preparing monocrystal silicon textured surface

A single crystal silicon and silicon wool technology, applied in the field of solar cells, can solve the problems of high cost, high consumption, high volatility of isopropanol, etc., and achieve the effects of low surface tension, cost reduction, and small corrosion thickness

Inactive Publication Date: 2010-01-27
BEIJING SOLAR ENERGY INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because isopropanol can make the prepared monocrystalline silicon more beautiful, isopropanol is often used in large-scale solar cell product

Method used

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  • Method for preparing monocrystal silicon textured surface
  • Method for preparing monocrystal silicon textured surface
  • Method for preparing monocrystal silicon textured surface

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Such as Figure 1~3 as shown, Figure 1~3 Be that the temperature of thermostatic bath is 80 ℃, alkali solution is 1.6 (% by mass percentage) sodium hydroxide, 0.1 (% by volume) sodium silicate, 0.6 (volume percent) isopropanol, 0.3 (volume percent) concentration is 5*10 -5 ~5*10 -3 mol / L perfluorooctane sulfonate solution, and when the corrosion time was 15min, the obtained monocrystalline silicon with pyramid textured surface was observed under a microscope to form a uniform pyramid textured surface ( Such as figure 1 shown), and the side length of the pyramid is 1-8 μm (such as figure 2 , image 3 shown), the etched thickness on the single crystal silicon is 12 μm.

Embodiment 2

[0020] When the temperature of the thermostat is 75°C, the alkaline solution is 1.6 (% by mass) sodium hydroxide, 0.1 (% by mass) sodium silicate, 0.6 (% by volume) isopropanol, and 0.3 (% by volume) at a concentration of 5*10 -5 ~5*10 -3 mol / L perfluorooctane sulfonate solution, and when the etching time is 20min, the side length of the pyramid on the obtained monocrystalline silicon textured surface is 1-8μm (please check here!), and the monocrystalline silicon is corroded The drop thickness is 13μm (check here!).

Embodiment 3

[0022] When the temperature of the thermostat is 85°C, the alkaline solution is 1.6 (% by mass) sodium hydroxide, 0.1 (% by mass) sodium silicate, 0.6 (% by volume) isopropanol, and 0.3 (% by volume) at a concentration of 5*10 -5 ~5*10 -3 mol / L perfluorooctane sulfonate solution, and when the etching time is 10 minutes, the side length of the pyramid on the obtained monocrystalline silicon textured surface is 1-8 μm, and the etched thickness of the monocrystalline silicon is 10 μm.

[0023] In the above-mentioned examples, perfluorooctane sulfonate is an anionic neutral surfactant with very high thermodynamic and chemical stability. It does not decompose at 350-400°C. In special application systems such as media, it can play its role as a surfactant stably and effectively; perfluorooctane sulfonate also has good compatibility, which can be well compatible with other surfactants and components in the system, And it can reduce the surface tension of the aqueous solution to a ve...

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Abstract

The invention relates to a method for preparing monocrystal silicon textured surfaces, which comprises the following steps: (1). preparing alkali corrosive liquid comprising an alkali solution, sodium silicate and isopropanol in a thermostatic bath at the temperature of 75-85DEG C, wherein the alkali solution has the volume percent of 1-2.5 percent, the sodium silicate has the mass percent of 0.1-2 percent, and the isopropanol has the mass percent of 0.5-3 percent; (2). adding a perfluorooctyl sulfonate solution with the concentration of 5*10<-5>-5*10<-3>mol/L into the thermostatic bath filled with the alkali corrosive liquid in step 1 such that the volume percent of perfluorooctyl sulfonate solution is 0.2-1 percent, simultaneously putting monocrystal silicon into the thermostatic bath for corrosion reaction, taking out the monocrystal silicon after 10-20 minutes, flushing with deionized water and drying. Pyramids formed on the prepared monocrystal silicon textured surfaces have small and uniform sizes, and the method is favorable for improving the efficiency of solar batteries and can be used for the large-scale production of the solar batteries.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing monocrystalline silicon textured surfaces. Background technique [0002] In recent years, due to the increasingly tense issues of energy and the environment, the solar cell photovoltaic module industry has developed rapidly. Reducing production costs and improving the efficiency of solar cells is the top priority of current research. One of the effective ways to improve the efficiency of solar cells is to increase the light-absorbing ability of solar cells, and the light-absorbing ability mainly depends on the suede surface formed on the surface of monocrystalline silicon. Pyramid size and uniformity. The smaller and more uniform the pyramid size on the textured surface, the stronger the light absorption ability of the monocrystalline silicon textured surface, and the higher the conversion efficiency. Existing methods for preparing monocrystalline sil...

Claims

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Application Information

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IPC IPC(8): C23F1/32C30B33/10H01L31/18
Inventor 勾宪芳许颖励旭东宋爽张燕鹏谢芳吉
Owner BEIJING SOLAR ENERGY INST
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