Environmentally-friendly low-series resistance crystalline silicon solar cell back electrode silver paste

A solar cell and back electrode technology, applied to conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve problems such as low photoelectric conversion efficiency, poor printability, and large series resistance, and achieve Improve photoelectric conversion efficiency, good contact, and improve conversion efficiency

Inactive Publication Date: 2015-10-21
苏州柏特瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ingredients of the back electrode of the existing crystalline silicon solar cells have poor printability, large series resistance, and low photoelectric conversion efficiency.

Method used

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  • Environmentally-friendly low-series resistance crystalline silicon solar cell back electrode silver paste
  • Environmentally-friendly low-series resistance crystalline silicon solar cell back electrode silver paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The environment-friendly low series resistance crystalline silicon solar cell back electrode silver paste of the present embodiment is formulated by 55g of silver-aluminum mixed powder, 2.2g of lead-free glass powder, 0.4g of inorganic additives and 42.4g of organic binder; The aluminum powder in the silver-aluminum mixed powder is 2.2g; the nano silicon powder in the inorganic additive is 0.05g.

[0014] After the above-mentioned ingredients were stirred and mixed uniformly in a container, the silver paste was obtained after grinding and dispersing on a three-roll mill for 2 hours.

[0015] Fineness of the silver paste: no more than 10 μm; viscosity: (25°C, Brookfield HB II Pro+) 44.5Pa·s.

[0016] The environment-friendly low series resistance crystalline silicon solar cell back electrode silver paste and the comparative silver paste of this embodiment were printed and produced in a crystalline silicon solar cell for trial use, and their electrical performance results...

Embodiment 2

[0021] The silver paste for the back electrode of the environment-friendly low series resistance crystalline silicon solar cell of the present embodiment is formulated by 55g of silver-aluminum mixed powder, 2.2g of lead-free glass powder, 0.45g of inorganic additives and 42.35g of organic binder; The aluminum powder in the silver-aluminum mixed powder is 2.2g; the nano silicon powder in the inorganic additive is 0.07g.

[0022] After the above-mentioned ingredients were stirred and mixed uniformly in a container, the silver paste was obtained after grinding and dispersing on a three-roll mill for 2 hours.

[0023] Fineness of the silver paste: no more than 10 μm; viscosity: (25°C, Brookfield HB II Pro+) 44.5Pa·s.

[0024] The environment-friendly low series resistance crystalline silicon solar cell back electrode silver paste and the comparative silver paste of this embodiment were printed and produced in a crystalline silicon solar cell for trial use, and their electrical pe...

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Abstract

The invention relates to a silicon solar cell back electrode raw material, in particular, an environmentally-friendly low-series resistance crystalline silicon solar cell back electrode silver paste. With the environmentally-friendly low-series resistance crystalline silicon solar cell back electrode silver paste of the invention adopted, the problems of poor printing performance, large series resistance and low photoelectric conversion efficiency of the components of a silicon solar cell back electrode can be solved. The environmentally-friendly low-series resistance crystalline silicon solar cell back electrode silver paste is composed of the following components in part by weight: 50 to 58 parts of silver aluminum mixed powder, 1 to 3 parts of lead-free glass powder, 0.1 to 1 part of inorganic additive, and 39 to 48 parts of organic adhesive; the fine degree of the silver paste is smaller than 15 micron; and the viscosity of the silver paste ranges from30 to 60Pa.s. According to the environmentally-friendly low-series resistance crystalline silicon solar cell back electrode silver paste of the invention, irregularly-shaped silver powder and spherical aluminum powder are adopted as the base materials of the silver paste; a uniform and compact silver conductive layer is formed on the back surface of a silicon wafer in a high-temperature sintering treatment process, and excellent ohmic contact can be realized between the silver conductive layer and an aluminum back surface field as well as between the silver conductive layer and the silicon wafer; and therefore, lower series resistance and higher photoelectric conversion efficiency can be realized, and the weldability and adhesion of a back electrode can be improved, and the series resistance of a cell sheet can be small, and conversion efficiency is high.

Description

technical field [0001] The invention relates to a raw material for a back electrode of a crystalline silicon solar cell, in particular to an environment-friendly silver paste for a back electrode of a crystalline silicon solar cell with low serial resistance. Background technique [0002] A crystalline silicon solar cell is a semiconductor device that can convert solar energy into electrical energy. Under the condition of light, a photogenerated current will be generated inside the solar cell, and the electrical energy can be output through the electrodes. The back electrode of crystalline silicon solar cells mainly uses metallic silver paste, which is prepared from raw materials such as metallic silver powder, organic binder, inorganic glass powder and additives. It requires silver paste to have excellent printability, good ohmic contact with silicon wafer after sintering, excellent adhesion and soldering performance, etc. However, the existing crystalline silicon solar ce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
Inventor 白少勇魏艳彪李小龙
Owner 苏州柏特瑞新材料有限公司
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