Ultrasonic velvet making method of solar cell slice

A solar cell, ultrasonic technology, applied in the direction of circuits, electrical components, final product manufacturing, etc., can solve problems such as affecting the suede effect, and achieve the effect of good corrosion and improved production effect.

Inactive Publication Date: 2009-12-09
SHANGHAI SOLAR ENERGY S&T
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

When making suede, the reaction between silicon and sodium hydroxide solution will generate a large amount of hydrogen gas, and these hydrogen bubbles are easy to adhere to the surface of the silicon wafer, thus greatly affecting the effect of suede production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The ultrasonic texturing method of solar battery sheet of the present invention is to put into the mixed solution of sodium hydroxide and isopropanol (wherein, the concentration of sodium hydroxide is 0.95%-1.05%, the concentration of isopropanol is 4.95%-5.05%). Put a group of silicon wafers in the above solution, and turn on the ultrasonic cleaning machine for texturing.

[0011] The volume of the cleaning barrel of the ultrasonic cleaning machine adopted in the present invention is 100 liters, and 500 silicon wafers are put into once to carry out cashmere making. If an ultrasonic cleaning machine with cleaning barrels of different volumes is used, silicon wafers are also placed in this proportion.

[0012] We conducted comparative tests on 500 pieces of silicon wafers for the two methods of texturing with an ultrasonic cleaning machine and without an ultrasonic cleaning machine. The average results of the tests are shown in Table 1.

[0013] Table 1

[0014] ...

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PUM

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Abstract

The invention provides an ultrasonic velvet making method of a solar cell slice. A mixed solution of sodium hydroxide and isopropyl alcohol is put in a cleaning barrel of an ultrasonic cleaning machine; a group of silicon slices are put in the solution; and the ultrasonic cleaning machine is started to make velvets. The ultrasonic velvet making method of a solar cell slice utilizes the high-frequency mechanical vibration of the ultrasonic cleaning machine, and then the high-frequency mechanical vibration is transmitted to liquid trough a vibration plate. The energy of ultrasonic waves in the solution is forwards radiated with regularly-changed densities so as to continuously impact attachments on the surface of an object to ensure that bubbles are quickly stripped off, thus the sodium hydroxide solution can better corrode the surfaces of the silicon slices, thereby greatly improving the making effect of a velvet surface.

Description

technical field [0001] The invention relates to a manufacturing process of a solar cell, in particular to an ultrasonic texturing method for a solar cell. Background technique [0002] As an emerging clean and renewable energy source, solar cells have attracted much attention due to their advantages of directly converting solar energy into electrical energy, long life, simple maintenance, and unattended operation. Solar power systems have been used more and more widely. [0003] How to improve the conversion efficiency of silicon wafers is the focus of solar cell research. Making texture on the surface of crystalline silicon solar cells is an important method to improve the conversion efficiency of solar cells, and has been widely used in the production of single crystal silicon. Texture production is based on the anisotropic corrosion characteristics of alkali solution on silicon wafers. By forming randomly distributed pyramid-structured textures on the surface of single c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 蒋妍婷
Owner SHANGHAI SOLAR ENERGY S&T
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