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Solar cell production method

A technology for solar cells and silicon wafers, used in circuits, electrical components, and final product manufacturing, etc., can solve the problems of whitening and yellowing at the edges, and the thickness and color of the dry black silicon coating, so as to reduce the whitening of the edges, The effect of reducing the coating isolation rate and saving costs

Active Publication Date: 2018-01-19
RISEN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the continuous development of the photovoltaic industry and the continuous innovation of solar cell manufacturing technology, black silicon technology has gradually highlighted its advantages and is still accepted by the industry. At present, it has gradually occupied the solar cell manufacturing market, but there are still certain technical defects. The main defect lies in the current The dry-process black silicon coating has more thick colors, and the edges are white and yellow seriously

Method used

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preparation example Construction

[0015] The present invention provides a method for preparing solar cells, which includes the following steps: pre-treatment steps for coating, anti-reflection coating and post-treatment steps for coating.

[0016] The silicon wafer processing steps before coating include: cleaning, texturing, diffusion, dephosphorization silicon glass, edge insulation and other steps.

[0017] The post-treatment steps of coating include: printing, sintering and other steps.

[0018] The anti-reflective coating step is specifically as follows: the silicon wafers that have undergone coating pretreatment are loaded into a non-film-saturated graphite boat for PECVD coating, where the graphite boat is used for 70 to 90 times, and the cleaning process is performed once, and the cleaning is completed The latter graphite boat is loaded into the PECVD tube for non-film saturation. After the non-film saturation is completed, it can continue to be used for silicon wafer coating.

[0019] Among them, the cleaning...

Embodiment 1

[0025] Cleaning: will contain trace boron and the size is 156×156mm 2 The P-type standard silicon crystal is cleaned.

[0026] Texturing: remove the mechanical damage layer of the silicon wafer and texture the surface to make the surface of the silicon wafer uneven, allowing sunlight to form multiple reflections and enhancing light absorption.

[0027] Diffusion: Place the silicon wafer in a quartz tube diffusion furnace, and first pass in oxygen to form SiO on the surface of the silicon wafer 2 Layer, then pass the reactive gas POCl 3 With O 2 , POCl 3 With O 2 Reaction produces P 2 O 5 , P 2 O 5 It reacts with silicon wafer to generate phosphorus atoms, which are deposited on SiO 2 Keep the temperature at 800~900℃ to make SiO 2 The phosphorous atoms in the silicon wafer are pushed into the silicon wafer to form a PN junction and complete the diffusion process.

[0028] Phosphorus-removed silica glass: The silicon wafers after the diffusion process are passed through containing HF, H...

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PUM

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Abstract

The invention discloses a solar cell preparation method comprising the steps of a pre-coating processing step, an antireflection film coating step and a post-coating processing step, wherein the antireflection film coating step specifically comprises the sub-steps of filling a silicon wafer has been subjected to pre-coating processing into a graphite boat for unfilmed saturation to perform PEVCD coating, cleaning the graphite boat after being used for 70-90 times, filling the cleaned graphite boat into the PEVCD pipe to perform unfilmed saturation, and after unfilmed saturation, continuously coating the silicon wafer. According to the technology provided by the invention, the phenomenon that the edge of the solar cell becomes white is greatly reduced, chromatic aberration uniformity of thesolar cell is improved, a reject ratio of products is reduced, and cost is saved.

Description

Technical field [0001] The invention relates to the field of solar cell manufacturing, in particular to a method for preparing solar cell sheets. Background technique [0002] With the continuous development of the photovoltaic industry and continuous innovation in solar cell manufacturing technology, black silicon technology has gradually highlighted its advantages and is still available in the industry. It has gradually occupied the solar cell manufacturing market, but there are still certain technical defects. The main defect lies in the current The dry-process black silicon coating has many thick colors, and the edges are whitish and yellowish. Summary of the invention [0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a solar cell preparation method that can improve the edge effect of the silicon wafer. [0004] The purpose of the present invention is achieved by adopting the following technical solutions: [0005...

Claims

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Application Information

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IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 何长春仇杰葛竖坚翟贝贝
Owner RISEN ENERGY
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