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Additive for polycrystalline silicon wafer acidity texture preparation liquid and use method thereof

A technology of texturing liquid and additives, applied in chemical instruments and methods, crystal growth, post-processing details, etc., can solve the problems of poor texturing stability, high surface reflectivity, poor uniformity, etc., to achieve configuration and The effect of simple process, good repeatability and low equipment

Active Publication Date: 2012-01-25
CHANGZHOU SHICHUANG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The texturizing effect of this acidic texturing solution is not very ideal, and the existing problems include: large size and poor uniformity of the suede surface, obvious color difference between different crystal grains, and dark spots with macroscopic appearance such as black lines. Corrosion pits, high surface reflectivity, poor texturing stability

Method used

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  • Additive for polycrystalline silicon wafer acidity texture preparation liquid and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take the following process steps:

[0016] 1) Preparation of additives: using 100ml deionized water as a solvent, 0.5ml triethanolamine and 0.1g polyvinylpyrrolidone are dissolved in deionized water;

[0017] 2) Preparation of acidic texturing liquid: Dissolve 1L of hydrofluoric acid and 4L of nitric acid in 5L of deionized water to obtain 10L of acidic texturing liquid;

[0018] 3) Preparation of acid texturing agent: add 100ml of additives to 10L of acid texturing solution;

[0019] 4) Texturing: immerse the polycrystalline silicon wafers for solar cells in the texturing solution for surface texturing, the texturing temperature is 4°C, and the texturing time is 300 seconds.

[0020] figure 1 The scanning electron microscope plane photograph of the surface texture of the obtained polycrystalline silicon wafer is given. From the figure, it can be seen that a pit-like texture is formed on the surface of the polycrystalline silicon wafer after the texture is made. The size of the ...

Embodiment 2

[0022] Take the following process steps:

[0023] 1) Preparation of additives: using 100ml of deionized water as a solvent, dissolve 2ml of triethanolamine and 0.01g of polyvinylpyrrolidone in deionized water;

[0024] 2) Preparation of acidic texturing liquid: Dissolve 2L of hydrofluoric acid and 6L of nitric acid in 5L of deionized water to obtain 13L of acidic texturing liquid;

[0025] 3) Preparation of acid texturing agent: add 65ml of additives to 13L acid texturing solution;

[0026] 4) Texturing: immerse the polycrystalline silicon wafer for solar cells in the texturing solution for surface texturing, the texturing temperature is 7°C, and the texturing time is 150 seconds.

Embodiment 3

[0027] Example 3 (comparative)

[0028] Take the following process steps:

[0029] 1) Preparation of acid texturing liquid: Dissolve 1L hydrofluoric acid and 4L nitric acid in 5L deionized water to obtain 10L acid texturing liquid;

[0030] 2) Texturing: immerse the polycrystalline silicon wafers for solar cells in the texturing solution for surface texturing, the texturing temperature is 7°C, and the texturing time is 150 seconds.

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Abstract

The invention relates an additive for a polycrystalline silicon wafer acidity texture preparation liquid, an acidity texture preparation solution containing the additive and a preparation method thereof, and a method for making texture for the polycrystalline silicon wafer by adding the additive or acidity texture preparation solution. According to the invention, the texture with the advantages of good evenness, small and even suede size can be obtained, and crystal particles do not have obvious chromatic aberration. The additive disclosed by the invention has the advantages of no toxicity, no corrosion, no irritation as well as no burning and explosion danger and is harmless to the human body and the environment. In addition, the solution has the advantages of simplicity in preparation and use technology, simple equipment and good repeatability.

Description

Technical field [0001] The invention relates to an additive for polycrystalline silicon wafer acid texturing liquid, an acid texturing agent containing the additive and a preparation method thereof, and a method for texturing polycrystalline silicon wafers by using the additive or acid texturing agent. Background technique [0002] In the solar cell preparation process, in order to improve the performance and efficiency of the solar cell, it is necessary to make a suede on the surface of the silicon wafer. The effective suede structure can make incident sunlight reflect and refract on the surface of the silicon wafer multiple times, changing the incident light The way forward in silicon. On the one hand, the optical path is extended, thereby increasing the absorption rate of the silicon wafer for infrared light; on the other hand, more photons are absorbed in the region near the pn junction to generate photo-generated carriers, which are more It is easy to be collected, thus inc...

Claims

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Application Information

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IPC IPC(8): C23F1/24C30B33/10
Inventor 符黎明李明陈培良
Owner CHANGZHOU SHICHUANG ENERGY CO LTD