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Etching liquid for preparing texture surface of monocrystalline silicon solar cell

A solar cell and corrosion solution technology, applied in the directions of crystal growth, post-processing details, and post-processing, etc., can solve the problems of unsuitable industrial production, difficult control of the texturing process, and increased preparation steps, so as to achieve good stability and ensure the quality of the texture. Surface size and uniformity, effect of high boiling point

Active Publication Date: 2013-06-05
CSI CELLS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found in practical applications that the isopropanol system has the following problems: (1) because the isopropanol system is volatile and unstable, it needs liquid replenishment in the process of making texture, which increases the preparation steps; (2) the use of isopropanol system (3) The texturing process using isopropanol system is difficult to control and has poor repeatability; thus it is not suitable for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] An etching solution for preparing the textured surface of monocrystalline silicon solar cells, by weight, comprising:

[0024] (a) Sodium hydroxide: 2%;

[0025] (b) Sodium silicate: 4%;

[0026] (c) 1,3,5-cyclohexanetriol: 6%;

[0027] The balance is water.

[0028] First, add solute mass fraction of 2wt% NaOH and 4wt% NaSiO in the texturing tank 3 and solute mass fraction of 6wt% 1,3,5-cyclohexanetriol, heated and maintained at 98 ° C; Medium polishing to remove the damaged layer for 1min, cleaning with deionized water; finally putting it into the above-mentioned etching solution, the etching time is 9min, the quality difference of silicon wafer etching before and after texturing is 0.6g, continuous texturing 18 batches, all can get Texture with similar size and uniformity (for each piece of silicon wafer texturing, 1g of solid NaOH needs to be supplemented), and the corrosion solution of this system is equivalent to the single crystal texture prepared by the conv...

Embodiment 2

[0030] An etching solution for preparing the textured surface of monocrystalline silicon solar cells, by weight, comprising:

[0031] (a) Sodium hydroxide: 1.5%;

[0032] (b) Sodium silicate: 4.5%;

[0033] (c) 1,3,5-cyclohexanetriol: 5%;

[0034] (d) Alkyl synthetic alcohol alkoxylates: 0.1%;

[0035] The balance is water.

[0036] First, add 1.5wt% NaOH and 4.5wt% NaSiO in the texturing tank 3 and 1,3,5-cyclohexanetriol and alkyl synthetic alcohol alkoxylates (1,3,5-cyclohexanetriol and alkyl synthetic alcohol alkoxylates) with a solute mass fraction of 5wt% The volume ratio is 50:1), the temperature is heated and kept at 90°C; then a 156mm×156mm single crystal p-type silicon wafer is polished in a NaOH solution with a mass fraction of 20wt% to remove the damaged layer for 1min, and cleaned with deionized water; Finally put it into the texturing solution, the corrosion time is 12min, the mass difference of silicon wafers etched before and after texturing is 0.8g, contin...

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Abstract

The invention discloses an etching liquid for preparing a texture surface of a monocrystalline silicon solar cell. The etching liquid comprises the following components by weight: (a) 1-10% of base; (b) 3-15% of sodium silicate; (c) 5-20% of 1,3,5-cyclohexane triol; and the balance of water. By using the etching liquid disclosed by the invention, the size and uniformity of the texture surface areguaranteed; the prepared texture surface has the size and uniformity equivalent to those of an IPA system; and the etching liquid can be applied to a monocrystalline silicon texturing system and has a positive practical significance.

Description

technical field [0001] The invention relates to an etchant, in particular to an etchant for preparing the textured surface of a single crystal silicon solar cell, which is used to prepare the textured structure of the solar cell. Background technique [0002] Conventional fossil fuels are increasingly depleted. Among all sustainable energy sources, solar energy is undoubtedly the cleanest, most common and most potential alternative energy source. At present, among all solar cells, silicon solar cells are one of the solar cells that have been widely commercialized. This is because silicon materials have extremely abundant reserves in the earth's crust, and silicon solar cells have Excellent electrical and mechanical properties; among them, monocrystalline silicon solar cells occupy most of the market share. [0003] At present, the conventional production process of monocrystalline silicon solar cells includes: texturing, diffusion, insulation, coating, and silk screen sinte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B33/10C23F1/40
Inventor 张为国王栩生孟祥熙辛国军章灵军
Owner CSI CELLS CO LTD
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