Non-alcoholic monocrystalline silicon flock making additive

A technology of crystalline silicon texturing and additives, applied in the direction of sustainable manufacturing/processing, crystal growth, final product manufacturing, etc., can solve problems such as toxicity, large usage, and fluctuations in photoelectric conversion efficiency, so as to avoid environmental pollution and reduce manufacturing costs. Down cost, the effect of eliminating hydrogen bubbles

Inactive Publication Date: 2012-07-18
苏州先拓光伏科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, isopropanol (or ethanol) is not a good texturing aid
First of all, the amount of isopropanol used in the texturing process is relatively large (generally accounting for more than 5% of the total volume of the corrosion solution), and isopropanol (or ethanol) will continue to volatilize, so it needs to be added continuously, which makes isopropanol Alcohol (or ethanol) has become the main source of cost in the texturing process
Secondly, isopropanol (or ethanol) is not an environmentally friendly chemical reagent, it is toxic and has an unpleasant smell
Furthermore, the use of isopropanol (or ethanol) to assist the texturing of monocrystalline silicon wafers tends to easily obtain large and uneven textured pyramids, which easily increases the contact resistance of the metal electrodes of the solar cell, resulting in crystalline silicon solar cells. Cell process instability and fluctuations in photoelectric conversion efficiency
These deficiencies above make isopropanol (or ethanol) will withdraw from the manufacturing field of crystalline silicon solar cell gradually

Method used

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  • Non-alcoholic monocrystalline silicon flock making additive
  • Non-alcoholic monocrystalline silicon flock making additive

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Example 1. An alcohol-free monocrystalline silicon texturing additive was prepared by using citric acid, sodium dodecylbenzenesulfonate and deionized water. The concentration of citric acid was 3 wt%, and the concentration of sodium dodecylbenzenesulfonate was 2 wt%. Then, the alcohol-free monocrystalline silicon texturing additive is added to the aqueous solution of sodium hydroxide with a concentration of 1.2 wt%, and the volume ratio of the alcohol-free monocrystalline silicon texturing additive in the total solution is 1.0v / v%. Then heat the solution to 80°C, put a single crystal silicon chip with an area of ​​125 mm x 125 mm and a thickness of about 200 microns into the solution for corrosion and texturing. The corrosion time is 20 minutes, and then the silicon chip is taken out, cleaned, Dry and observe again. The textured pyramids of the resulting silicon wafers are shown in the electron microscope images in the accompanying drawings. It can be seen from the acc...

example 2

[0019] Example two, using sodium citrate, sodium dodecylbenzenesulfonate and deionized water to prepare alcohol-free monocrystalline silicon texturing additives, the concentration of sodium citrate is 4wt%, and the concentration of sodium dodecylbenzenesulfonate is 1.8 wt%. Then, the alcohol-free monocrystalline silicon texturing additive is added to the aqueous solution of sodium hydroxide with a concentration of 1.2 wt%, and the volume ratio of the alcohol-free monocrystalline silicon texturing additive in the total solution is 1.0v / v%. Then heat the solution to 80°C, put a single crystal silicon chip with an area of ​​125 mm x 125 mm and a thickness of about 200 microns into the solution for corrosion and texturing. The corrosion time is 20 minutes, and then the silicon chip is taken out, cleaned, Dry and observe again.

example 3

[0020] Example 3. Using sodium citrate, sodium dodecylbenzenesulfonate and deionized water to prepare an alcohol-free monocrystalline silicon texturing additive, the concentration of sodium citrate is 5 wt%, and the concentration of sodium dodecylbenzenesulfonate is 1.5% wt%. Then, the alcohol-free monocrystalline silicon texturing additive is added to the aqueous solution of sodium hydroxide with a concentration of 1.2 wt%, and the volume ratio of the alcohol-free monocrystalline silicon texturing additive in the total solution is 1.0v / v%. Then heat the solution to 80°C, put 200 single-crystal silicon wafers with an area of ​​125mm×125mm and a thickness of about 200 microns into the solution for etching for 20 minutes, and then take out the silicon wafers. Wash and tumble dry. After adding 150 grams of sodium hydroxide to the solution, put 200 monocrystalline silicon wafers into the solution for texturing. Repeat the above process until 30 batches of monocrystalline silicon...

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Abstract

The invention provides relates to the technical field of production of crystalline silicon solar batteries, in particular to a non-alcoholic monocrystalline silicon flock making additive. The non-alcoholic monocrystalline silicon flock making additive consists of citric acid (sodium citrate), sodium dodecyl benzene sulfonate and deionized water. When the non-alcoholic monocrystalline silicon flock making additive is applied to manufacturing of suede of a monocrystalline wafer, uniform, thin and dense suede pyramid can be obtained without using alcohol such as isopropanol or ethanol, so the flock manufacturing cost can be reduced, environmental pollution caused by the alcohol is avoided, the process of the crystalline silicon solar battery is stable, and good practical value is achieved.

Description

Technical field: [0001] The invention relates to the technical field of crystalline silicon solar cell production, in particular to an alcohol-free monocrystalline silicon texturing additive. Background technique: [0002] Solar energy is a clean and sustainable energy, and solar photovoltaic power generation technology is an important way to utilize solar energy. It can not only directly convert solar energy into electrical energy, but also without any mechanical rotation or movement during the conversion process, and will not emit gas And Smell, therefore, has received strong support from governments around the world. The crystalline silicon solar cell is the protagonist in the field of photovoltaic power generation technology. So far, crystalline silicon solar cells occupy more than 90% of the entire photovoltaic market. However, an important bottleneck restricting the widespread use of crystalline silicon solar cells is the high cost of power generation, which is not y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B33/10C23F1/32H01L31/18
CPCY02P70/50
Inventor 屈盛
Owner 苏州先拓光伏科技有限公司
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