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Method for improving texturing yield of silicon wafer for solar cell

A technology of solar cells and silicon wafers, applied in chemical instruments and methods, circuits, electrical components, etc., can solve problems such as low efficiency of solar cells and poor texturing of silicon wafers, and achieve the effect of improving conversion efficiency and yield

Pending Publication Date: 2022-05-06
SUZHOU TALESUN SOLAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual production, there are often some poorly textured silicon wafers. If the poorly textured silicon wafers are transferred to the finished product, the efficiency of the finished cell will be low

Method used

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  • Method for improving texturing yield of silicon wafer for solar cell
  • Method for improving texturing yield of silicon wafer for solar cell
  • Method for improving texturing yield of silicon wafer for solar cell

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Experimental program
Comparison scheme
Effect test

Embodiment

[0037] The method for improving the texturing yield of silicon wafers for solar cells in this embodiment is divided into two steps: degreasing cleaning and immersion cleaning, and takes about 48 hours in total.

[0038] The reagents used for degreasing and cleaning are shown in Table 2.

[0039] Table 2

[0040] degreasing cleaning NaOH (45%) DI water 2O2(32％) heating bubbling cycle Remark Texturing tank 4L 150L 8L 60℃ open open Add 2L-H2O2 every 2 hours

[0041] The specific implementation is as follows:

[0042] 1-1) Add 4L NaOH solution (45% mass fraction), 150L deionized water and 8L H 2 o 2 solution (32% mass fraction). Raise the temperature of the texturing tank to 60°C, and turn on the bubbling and circulation functions. The bubbling is adjusted to an appropriate size, and the bubbles are visible, but not too large to cause the solution to splash out of the tank. due to H 2 o 2 Will decompose, need to add 2LH every 2 hour...

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Abstract

The invention discloses a method for improving the texturing yield of a silicon wafer for a solar cell, which comprises the following steps of: A, adding a first mixed solution of alkali liquor and hydrogen peroxide into a texturing groove of the silicon wafer, heating and bubbling for at least 10 hours, and adding the hydrogen peroxide at set intervals during the period; b, emptying the first mixed solution in the texturing tank, and adding deionized water for cleaning; c, adding a second mixed solution of alkali liquor and a texturing additive into the texturing tank, heating, and carrying out bubbling treatment for at least 10 hours; and D, emptying the second mixed solution in the texturing tank, and adding deionized water for cleaning. According to the method, the silicon wafer texturing groove of the solar cell is pretreated, so that the texturing yield is improved, and the conversion efficiency of the cell is further improved.

Description

technical field [0001] The invention belongs to the field of solar cell preparation and relates to a method for improving the texturing yield of silicon wafers for solar cells. Background technique [0002] Against the backdrop of the dual carbon targets, photovoltaics, as a clean energy source, are receiving more and more attention. In recent years, the installed capacity of photovoltaics has been increasing day by day, and various photovoltaic enterprises are rapidly expanding their production. Texturing is the first process of the crystalline silicon solar cell manufacturing process. It mainly plays the role of cleaning the surface of the silicon wafer, removing the cutting loss of the silicon wafer surface and preparing the light-trapping texture, which can improve the utilization rate of light. In actual production, there are often some poorly textured silicon wafers. If the poorly textured silicon wafers are transferred to finished products, the efficiency of the finis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18H01L31/0236C30B33/10
CPCH01L31/1804H01L31/02363C30B33/10
Inventor 周海龙张树德钱洪强荆蓉蓉张俊巍王展
Owner SUZHOU TALESUN SOLAR TECH CO LTD