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Cadmium telluride diaphragm solar battery corrosive fluid and its corrosive method

A technology for solar cells and etchants, applied in circuits, electrical components, sustainable manufacturing/processing, etc., can solve problems such as increasing leakage current, increasing contact grain boundaries, etc., to achieve the effect of reducing width, reducing compounding, and easy ohmic contact

Inactive Publication Date: 2009-04-15
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the usual etching process can also achieve tellurium rich layer, tunnel effect and good ohmic contact, but the etching increases the contact grain boundary, which increases the leakage current

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: preparation zinc-doped corrosion solution, wherein Br 2 : the volume percentage of methyl alcohol is 0.05: 100, the zinc salt used for doping zinc is zinc chloride, and the concentration of zinc ions in the new corrosion solution is 0.5mol / L, which is the corrosion solution;

[0015] Get a cadmium telluride solar cell (without adding transition layer, without adding and subtracting reflective film, etc.) with no back electrode, cut into two parts, and let a part be made according to the existing Br 2 - Methanol solution for general corrosion, part of which is for zinc-doped corrosion.

[0016] Zinc-doped corrosion process: the temperature of the corrosion solution and the high-purity water used for flushing is controlled at 20°C, the corrosion time is 180 seconds, flushed with water, and blown dry with nitrogen.

[0017] After coating C electrode and Ag electrode on cadmium telluride solar cells with general corrosion and zinc-doped corrosion, it was foun...

Embodiment 2

[0019] Preparation of zinc-doped corrosion solution: where Br 2 : The volume percentage of methanol is 0.5: 100, the zinc salt used for doping zinc is zinc acetate, and the concentration of zinc ions in the new corrosion solution is 1mol / L, which is the corrosion solution;

[0020] Take a cadmium telluride solar cell with no back electrode and a simplified process (no transition layer, no reflective film, etc.), and carry out zinc-doped corrosion.

[0021] Zinc-doped corrosion process: the temperature of the corrosion solution and the high-purity water used for washing is controlled at 30°C, the corrosion time is 80 seconds, flushed with water, and blown dry with nitrogen.

[0022] After coating the corroded cadmium telluride solar cell with C electrode and Ag electrode, it was found that the open circuit voltage after zinc doping corrosion was as high as 820mv (currently, the open circuit voltage of the cadmium telluride solar cell with the highest conversion efficiency in th...

Embodiment 3

[0024] HNO doped with zinc 3 -H 3 PO 4 -H 2 O mixed solution, in which HNO 3 :H 3 PO 4 :H 2 O (volume ratio)=1: 90: 40, the zinc salt that zinc is used is zinc nitrate, and the concentration that makes zinc ion concentration in new corrosion solution is 1.5mol / L, is corrosion solution;

[0025] Get a cadmium telluride solar cell with no back electrode and simplify the process (no transition layer, no anti-reflection film, etc.) 3 -H 3 PO 4 -H 2 O mixed solution), part of zinc-doped corrosion.

[0026] Zinc-doped corrosion process: the temperature of the corrosion solution and the high-purity water used for washing is controlled at 30°C, the corrosion time is 40 seconds, flushed with water, and blown dry with nitrogen.

[0027] Coated C and Ag electrodes on cadmium telluride solar cells with general corrosion and zinc-doped corrosion, and tested it. It was found that the open circuit voltage was 55mv higher after corrosion, and the short circuit current was increased...

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PUM

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Abstract

This is an erode liquid for cadmium telluride film solar battery and its erosion method. A zinc salt soluble in water or methanol is added into traditional HNO3-H3PO4-H2O or Br2-methanol solution with the concentration of ionic Zn between 0.01mol / L - 2mol / L. By applying zinc into the erode liquid, ionic Zn disperses into tellurium rich layer and heavy mixes in P type to form Te, Cd, Zn alloy film of electron reflection layer, and decrease the combination of electrons with cavities, so to effectively decrease surface current.

Description

technical field [0001] The invention relates to a cadmium telluride thin-film solar battery corrosion solution and an corrosion method. Background technique [0002] Cadmium telluride has a direct bandgap structure with a forbidden band width of about 1.45eV. It can absorb 100% of sunlight as long as a thin film of 3 μm to 5 μm is a good material for the light-absorbing layer of solar cells. Moreover, the cadmium telluride solar cell has high efficiency and low cost, so it has received extensive attention and attention. Theoretically, the conversion efficiency of cadmium telluride solar cells is 29%. According to reports, the highest conversion efficiency of small-area cadmium telluride solar cells in the world is only 16.5%, and the highest conversion efficiency of domestic small-area cadmium telluride solar cells is only 13.4%. In order to improve the maximum conversion efficiency of cadmium telluride solar cells, researchers have thought of many ways, such as changing th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0296H01L31/18
CPCY02P70/50
Inventor 羊亿黄芳李华维罗友良
Owner HUNAN NORMAL UNIVERSITY
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