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Texturing method for solar cell silicon wafer

A technology of solar cells and silicon wafers, which is applied to circuits, photovoltaic power generation, electrical components, etc., can solve problems such as increased costs, poor uniformity of suede corrosion pits, and complicated processes, and achieves reduced production costs, high production efficiency, and continuous Good results

Active Publication Date: 2018-04-06
RISEN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical grooving is not suitable for thin-substrate solar cells due to its large groove depth and high requirements on the thickness of silicon wafers, which increases the cost in disguise; although the honeycomb textured structure technology has excellent light-trapping effects, the process is complicated and unsuitable. Industrial production; the uniformity of texturing on large-area silicon wafers by electrochemical etching is unstable
As far as the current industrial production is concerned, the commonly used acid etching solution is nitric acid and hydrofluoric acid system to make texture, but those skilled in the art believe that the acid etching solution based on nitric acid and hydrofluoric acid is a self-catalyzed reaction, chemical reaction more severe, and the uniformity of the textured corrosion pits produced is poor, so the quality of the produced polysilicon cells is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for making texture of solar cell silicon chip, it comprises the following steps:

[0021] (1) Combine HF, HNO 3 The mixed solution with water, the mixed solution of KOH and water, and the mixed solution of HF, HCL and water are put into the first tank, the second tank and the third tank of the chain texture machine respectively, and the volume ratio For: HF:HNO 3 : water=1:2.0:2.4, KOH:water=7:160, HF:HCL:water=4:7:10; the water is pure water;

[0022] (2) Start the chain-type texturing machine so that the silicon wafers on the chain pass through the first slot, the second slot and the third slot in turn; after every 100 silicon wafers pass through the first slot, add HF 260ml , join HNO 3 90ml; after passing every 100 silicon wafers in the second tank, add 5ml of KOH and 50ml of water; after passing every 100 silicon wafers in the third tank, add 50ml of HF, 60ml of HCL, and add 10ml of water. The liquids in the three tanks were all replaced with new ones...

Embodiment 2

[0024] A method for making texture of solar cell silicon chip, it comprises the following steps:

[0025] (1) Combine HF, HNO 3 The mixed solution with water, the mixed solution of KOH and water, and the mixed solution of HF, HCL and water are put into the first tank, the second tank and the third tank of the chain texture machine respectively, and the volume ratio For: HF:HNO 3 : water=1:3.6:2.4, KOH:water=7:160, HF:HCL:water=4:7:10; the water is pure water;

[0026] (2) Start the chain-type texturing machine so that the silicon wafers on the chain pass through the first slot, the second slot and the third slot in turn; after every 100 silicon wafers pass through the first slot, add 300ml of HF , join HNO 3 140ml; after passing every 100 silicon wafers in the second tank, add 20ml of KOH and 70ml of water; after passing every 100 silicon wafers in the third tank, add 90ml of HF, 110ml of HCL, and 50ml of water. The liquids in the three tanks were all replaced with new on...

Embodiment 3

[0028] A method for making texture of solar cell silicon chip, it comprises the following steps:

[0029] (1) Combine HF, HNO 3 The mixed solution with water, the mixed solution of KOH and water, and the mixed solution of HF, HCL and water are put into the first tank, the second tank and the third tank of the chain texture machine respectively, and the volume ratio For: HF:HNO 3 : water=1:2.92:2.4, KOH: water=7:150, HF:HCL: water=4:5.5:10; the water is pure water;

[0030] (2) Start the chain-type texturing machine so that the silicon wafers on the chain pass through the first slot, the second slot and the third slot in turn; after every 100 silicon wafers pass through the first slot, add HF 285ml , join HNO 3 115ml; after passing through every 100 silicon wafers in the second tank, add 12ml of KOH and 60ml of water; after passing through every 100 silicon wafers in the third tank, add 70.5ml of HF, 85ml of HCL, and 25ml of water. The liquids in the three tanks were all r...

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PUM

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Abstract

The invention provides a texturization method of a silicon chip of a solar cell. The method includes following steps: 1) respectively putting a mixture of HF, HNO3 and water, a mixture of KOH and water, and a mixture of HF, HCL and water into a first trough, a second trough and a third through of a chain type texturization machine, wherein the volume ratio of HF to HNO3 to water is 1:2.0-3.6:2.4, the volume ratio of KOH to water is 7:120-160, the ratio of HF to HCL to water is 4:3-7:10, and the water is pure water; and (2) starting the chain type texturization machine. Compared with the prior art, according to the method, the silicon chip with good textured corrosion pit uniformity can be prepared without other additives, the absorptivity of light is high, the liquid-adding method is employed in a production process, the production continuity is good, the production efficiency is high, and the production cost can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of solar cell preparation, and in particular relates to a texturing method for a silicon chip of a solar cell. Background technique [0002] In the treatment of the surface of solar cells, texturing is the process of pre-cleaning the silicon surface and corroding it into a pyramid-like or honeycomb-like structure with strong alkali or strong acid. The purpose of texturing is that its function can not only reduce the reflectivity of the surface, remove the damaged layer, but also form a light trap (anti-reflection texture) inside the battery, and use the principle of light trapping to increase the movement of light in the silicon wafer. The effective length is conducive to the absorption of light by the silicon substrate, thereby improving the conversion efficiency of the solar cell. For this reason, people have tried many new wool-making processes, and these methods all can obtain better suede effect, but t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0236
CPCY02E10/50
Inventor 葛竖坚翟贝贝魏晓波何长春张文锋
Owner RISEN ENERGY