Multi-crystalline silicon wafer texturization additive

A polycrystalline silicon wafer and additive technology, applied in sustainable manufacturing/processing, crystal growth, final product manufacturing, etc., can solve the problems of increasing pit depth, difficult process, poor light trapping property of suede, and achieve improved wettability, The effect of stable process and fine concave and convex surface

Active Publication Date: 2015-05-27
CHANGZHOU JUNHE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the suede surface obtained by acid velvet has poor light trapping and high reflectivity, about 25%, and increasing the pit depth will bring difficulties to the subsequent process.

Method used

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  • Multi-crystalline silicon wafer texturization additive
  • Multi-crystalline silicon wafer texturization additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 0.5g of sodium citrate, 2g of citric acid, 0.05g of fluorocarbon surfactant, 0.4g of polyethylene glycol, and 0.6g of polyvinylpyrrolidone into the remaining water, mix and stir until uniform to obtain the preparation fleece additives. Add 100 g of this texturing additive into 19 kg of acid texturing liquid, and mix and stir evenly.

[0022] The polycrystalline silicon wafer is immersed in the above-mentioned acid texturing solution containing texturing additives for texturing, the temperature is controlled at 10°C, and the texturing time is 200s.

Embodiment 2

[0024] Add 0.7g of sodium citrate, 2.3g of citric acid, 0.06g of fluorocarbon surfactant, 0.6g of polyethylene glycol, and 0.5g of polyvinylpyrrolidone into the remaining water, mix and stir until uniform Texturing additives. Add 100 g of this texturing additive into 22 kg of acid texturing liquid, and mix and stir evenly.

[0025] The polycrystalline silicon wafer is immersed in the above-mentioned acid texturing solution containing texturing additives for texturing, the temperature is controlled at 15°C, and the texturing time is 140s.

Embodiment 3

[0027] Add 0.8g of sodium citrate, 2g of citric acid, 0.05g of fluorocarbon surfactant, 0.6g of polyethylene glycol, and 0.8g of polyvinylpyrrolidone into the remaining water, mix and stir until uniform to obtain the preparation fleece additives. Add 100 g of this texturing additive into 15 kg of acid texturing liquid, and mix and stir evenly.

[0028] The polycrystalline silicon wafer is immersed in the above acid texturing solution added with texturing additives for texturing, the temperature is controlled at 9° C., and the texturing time is 160 s.

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Abstract

The invention discloses a multi-crystalline silicon wafer texturization additive, which comprises the following components in percentage by mass: 0.08-0.8% of sodium citrate, 1.0-2.5% of citric acid, 0.03-0.07% of non-ionic surfactant, 0.08-0.8% of polyethylene glycol, 0.1-1% of polyvinylpyrrolidone and the balance of water. After being texturized through using the prepared multi-crystalline silicon wafer texturization additive, the multi-crystalline silicon wafer has an even surface, the reflective rate is reduced by 3-5%, and a battery conversion rate is promoted by 0.1-0.2%.

Description

technical field [0001] The invention relates to the technical field of polycrystalline silicon wafer texturing, in particular to a polycrystalline silicon wafer texturing additive. Background technique [0002] Polycrystalline silicon solar cells currently account for about 50% of the total global PV products, and their market share will continue to increase steadily. However, the conversion efficiency of polycrystalline silicon wafers on the market is generally lower than that of monocrystalline silicon wafer cells. The main reason is the lack of a cheap and efficient polysilicon texturing method. Good polysilicon texturing can greatly increase the absorption rate of sunlight, reduce reflection, increase short-circuit current, and achieve high photoelectric conversion efficiency of cells. [0003] Monocrystalline silicon solar cells are generally textured through the anisotropy of lye (KOH or NaOH) to obtain a random pyramid structure. The randomness of the crystal phase of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B33/10H01L31/18
CPCY02P70/50
Inventor 陆由东费婷倪丽萍赵海静
Owner CHANGZHOU JUNHE TECH
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