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Texturing method of monocrystalline battery and monocrystalline battery prepared by texturing method

A battery and monocrystalline technology, applied in the field of solar cells, can solve the problem of low RSH of monocrystalline cells, achieve the effect of improving cleanliness, avoiding abnormalities and leakage

Pending Publication Date: 2021-04-20
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] How to solve the low RSH caused by improper texturing of monocrystalline cells is a technical problem that needs to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a texturing method for a monocrystalline battery, the texturing method comprising the following steps:

[0048] (1) Loading: Insert the monocrystalline silicon wafer into the flower basket with a chip inserter and import it into the texturing machine;

[0049](2) Polishing: use a sodium hydroxide solution with a mass concentration of 2.0%, polish at 85°C for 200s, and control the weight loss at 0.28g;

[0050] (3) One-time cleaning: use 4% hydrogen peroxide and 1.5% sodium hydroxide solution to clean the polished surface at 72°C for 100 seconds, and then wash with water;

[0051] (4) Texturing: using sodium hydroxide+texturing additives to form a mixed solution for texturing;

[0052] (5) Secondary cleaning: wash the suede with water in a water tank after making the suede, and then wash the suede surface at 60°C for 140 seconds through a mixture of sodium hydroxide solution and 2.0% hydrogen peroxide with a mass concentration of 0.6%, and carry...

Embodiment 2

[0057] This embodiment provides a texturing method for a monocrystalline battery, the texturing method comprising the following steps:

[0058] (1) Loading: Insert the monocrystalline silicon wafer into the flower basket with a chip inserter and import it into the texturing machine;

[0059] (2) Polishing: use a sodium hydroxide solution with a mass concentration of 2.4%, polish at 80°C for 140s, and control the weight loss at 0.25g;

[0060] (3) One cleaning: use 3.6% hydrogen peroxide and 1.2% sodium hydroxide solution to clean the polished surface at 65°C for 140 seconds, and then wash with water;

[0061] (4) Texturing: Sodium hydroxide+texturing additive mixed solution forms texturing;

[0062] (5) Secondary cleaning: wash the suede with water in a sink after making the suede, and then wash the suede at 65°C for 120 seconds through a mixture of 1.0% sodium hydroxide solution and 1.5% hydrogen peroxide, and perform a second wash on the suede. Modification; then use the o...

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Abstract

The invention provides a texturing method of a monocrystalline battery and themonocrystalline battery prepared by the texturing method. The texturing method comprises the following steps: (1) polishing: polishing a monocrystalline silicon wafer in an alkali liquor, and enabling the weight reduction of the monocrystalline silicon wafer to be less than or equal to 0.4 g; (2) carrying out primary cleaning: cleaning the polished monocrystalline silicon wafer in the step (1) in a mixed solution of hydrogen peroxide and the alkali liquor, and then washing with water; (3) texturing; (4) carrying out secondary cleaning; (5) cleaning for the third time; and (6) lifting and drying the monocrystalline silicon wafer cleaned for three times in the step (5) to obtain the textured monocrystalline battery. Before an original texturing process, a silicon wafer is polished by using a low-concentration alkali liquor, a polished surface is cleaned by using hydrogen peroxide and weak base, and the textured surface is subjected to secondary modification after texturing so that the aim of removing organic matters and other impurities on the surface of the silicon wafer is fulfilled, and EL abnormality and electric leakage of the battery caused by pollution are avoided.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and relates to a texturing method for a monocrystalline cell and a monocrystalline cell prepared therefrom. Background technique [0002] The cost reduction and efficiency improvement brought about by the iteration of crystalline silicon solar cell technology has gradually become the main driving force to promote the development of the industry. In the past two years, monocrystalline solar cells have taken the lead in the crystalline silicon cell market due to their advantages in conversion efficiency. However, based on the problem of light-induced attenuation of single crystal cells, the cell process will improve cell reliability by increasing the refractive index of the coating process, but the refractive index increases, the electrical insulation performance deteriorates, and the stripping of the silver paste is easy to burn through the film, resulting in a low Rsh . The flow of single cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/068H01L31/0236H01L21/02C30B33/10C30B29/06
CPCY02E10/547Y02P70/50
Inventor 贾松燕何悦任永伟
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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