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Method for realizing selective emitter of solar battery

A technology of solar cells and solar cells, applied in circuits, electrical components, climate sustainability, etc., can solve problems such as high production costs and complex processes, achieve low production costs, simple operation procedures, and improve photoelectric conversion efficiency Effect

Active Publication Date: 2011-08-17
TRINA SOLAR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is complex and the production cost is high
Some processes that use the primary diffusion method to realize the selective emitter need to form an oxide film on the surface of the battery and then remove it. The process is complicated and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] A method for realizing a selective emitter of a solar battery. The solar battery has a solar battery sheet, and the surface of the solar battery sheet is divided into a battery grid line area and a battery non-grid line area.

[0013] Has the following steps:

[0014] a. The method of heavy diffusion is used on the solar cell to form a highly doped deep diffusion area on the surface of the solar cell;

[0015] b. In the non-grid area of ​​the battery, a layer of etching slurry layer that can corrode silicon is printed by screen printing. The etching slurry layer includes KOH and other organic components. The proportion of KOH in the etching slurry layer is 5 %~20%, other organic components such as propionic acid carbonate;

[0016] c. Put the solar cell into a reaction furnace with a temperature of 200-300°C for 10-60 seconds. The non-grid area of ​​the battery will be corroded to form a low-doped shallow diffusion area, and the uncorroded area of ​​the battery grid li...

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PUM

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Abstract

The invention relates to a method for realizing the selective emitter of a solar battery, which is used for forming the solar battery with the selective emitter. The method comprises the following steps: a. carrying out double diffusion on solar battery plates; b. printing an etching slurry layer capable of etching silicon on the non-grid region of the battery in a screen printing mode, wherein the etching slurry layer mainly comprises KOH; c. and putting the solar battery plates in a reacting furnace with the temperature of 200-300 DEG C to react for 10-60 seconds so that the non-grid regionof the battery is etched to form a low doped shallow-diffusion region, and the grid region of the battery is not etched to form a high doped deep-diffusion region, thereby forming the selective emitters of the solar battery plates. The invention has the advantages of simple operational process and low production cost, and the solar battery can form the selective emitter, thereby enhancing the photoelectric transformation efficiency of the solar battery.

Description

technical field [0001] The invention relates to a method for realizing a selective emitter of a solar cell. Background technique [0002] The selective emitter structure is one of the methods to achieve high efficiency in the production process of crystalline silicon solar cells. The selective emitter structure has two characteristics: 1) a highly doped deep diffusion region is formed in the cell grid line area; The non-gate line area forms a low-doped shallow diffusion area. These two features not only solve the dead layer problem, but also reduce the contact resistance between the silicon wafer surface and the metal electrode, thereby improving the open circuit voltage, short circuit current and fill factor. The photoelectric conversion efficiency of the solar cell is improved. [0003] At present, the conventional method to realize the solar selective emitter is the method of secondary diffusion, for example: first grow a layer of silicon dioxide film on the surface of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 张军
Owner TRINA SOLAR CO LTD