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Method for detecting mixed acid solution in manufacturing process of polycrystalline silicon solar cell

A technology of solar cells and detection methods, applied in the field of solar cells, can solve the problems of unstable production and difficult process debugging, and achieve the effect of less labor and less economic investment.

Active Publication Date: 2012-08-01
济宁高新科达科技项目服务有限公司
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Problems solved by technology

[0005] The present invention aims to overcome the production instability, For the problem of difficult process debugging, a detection method for the mixed acid solution used in the polycrystalline silicon solar cell manufacturing process is provided, which is used for real-time monitoring of the concentration and content of each component in the mixed acid solution

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] Analysis of the texturing fluid used in the texturing process of polycrystalline silicon solar panels:

[0040] Since the texturing solution has been used for a period of time, the solution should be composed of a mixed acid system of hydrofluoric acid + nitric acid + fluorosilicic acid. Before the test, take a certain amount of the texturing solution to be tested and dilute it 50 times. The specific detection steps are as follows:

[0041] (1) Determination of total acid concentration:

[0042] Take 20ml of the above-mentioned mixed acid solution diluted 50 times and transfer it to a 250ml polyethylene (PE) conical flask with a cover, then add 8~12g potassium chloride and 20~50g crushed ice to the PE conical flask and drop Add 4 drops of phenolphthalein indicator solution as indicator. Sodium hydroxide standard solution C 1 Titrate the solution to near the end point and record the volume V 1 =4.70ml; then use sodium hydroxide standard solution C 2 ...

Embodiment 2

[0064] In order to compare with Example 1, in this example, the unused initially prepared velvet liquid is selected for detection according to the method of the present invention. Because the texturing solution has not been used, the solution is composed of a mixed acid system of hydrofluoric acid + nitric acid. Before the test, a certain amount of the texturing solution to be tested is diluted 50 times. The specific detection steps are as follows:

[0065] (1) Determination of total acid concentration:

[0066] Take 20ml of the above-mentioned mixed acid solution diluted 50 times and transfer it to a 250ml polyethylene (PE) conical flask with a cover, then add 8~12g potassium chloride and 20~50g crushed ice to the PE conical flask and drop Add 4 drops of phenolphthalein indicator solution as indicator. Sodium hydroxide standard solution C 1 Titrate the solution to near the end point and record the volume V 1 =4.54ml; then use sodium hydroxide standard solutio...

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Abstract

The invention discloses a method for detecting a mixed acid solution in the manufacturing process of a polycrystalline silicon solar cell. The method is used for detecting a mixed acid system which consists of hydrofluoric acid, nitric acid and fluorosilicic acid. The method comprises the following steps of: detecting the total acid concentration of the solution by using an acid-base neutralization method; heating and boiling the solution which is subjected to acid-base neutralization, decomposing fluorosilicate to generate hydrogen ions, determining the content of the hydrogen ions by alkali liquor titration, and thus obtaining the concentration of the fluorosilicic acid by calculation; detecting the concentration of the nitric acid in the mixed acid solution by using an oxidation-reduction titration method; and subtracting the concentration of the fluorosilicic acid and the concentration of the nitric acid from the total acid concentration, and thus obtaining the concentration of the hydrofluoric acid. The method is simple in flow, easy to operate and low in economic investment and can be applied to long-term monitoring of a texturing process and an etching process in the production process of the polycrystalline silicon solar cell and stability of equipment, manpower resources are saved, high-end equipment is eliminated, detection accuracy can be over 95 percent.

Description

technical field [0001] The invention belongs to the field of solar cells, and in particular relates to a detection method for a mixed acid solution used in a polycrystalline silicon solar cell manufacturing process, which is used for detecting and real-time monitoring the concentration and content of each component in the mixed acid solution. Background technique [0002] The texturing process and wet etching process in the polycrystalline silicon solar cell manufacturing process often use mixed acid solution, hydrofluoric acid + nitric acid system (HF + HNO 3 ) is currently the main solution system in the texturing process and wet etching process for making polycrystalline silicon solar cells. In the texturing process, the surface structure of the polycrystalline silicon wafer is structured by chemical corrosion of the mixed acid solution, so as to reduce light reflection and increase the energy conversion efficiency of solar cells. The electrical performance parameters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N31/22G01N31/20G01N25/00
Inventor 牛春晓吴卫伟安子凤黄高山
Owner 济宁高新科达科技项目服务有限公司
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