Conductive silver paste for front electrode of solar battery and preparation method of conductive silver paste

A technology for solar cells and front electrodes, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. Poor denaturation and other problems, to achieve the effect of high electrode grid aspect ratio, small shading area, and good thixotropy

Inactive Publication Date: 2013-10-02
CHINA ACADEMY OF ENG PHYSICS FUNCTION MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The components of the currently used organic vehicle mainly include solvents, thickeners and surfactants. The silver paste of this system has poor thixotropy. After the silver paste is screen printed, it is deposited on the silicon wafer and continues to flow, making the prepared The aspect ratio of the front electrode of the solar cell is small, that is, the electrode width is large and the height is small, resulting in a large shading area on the front of the solar cell, which affects the performance of the solar cell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take by weighing silver powder 88g, glass powder 3g, organic vehicle (its component and percentage by weight are: ethyl cellulose 8%, terpineol 52.6%, butyl carbitol acetate 27.2%, dibutyl phthalate 12%, polyamide wax 0.2%) 9g, after mixing evenly, grind on a three-roll mill to obtain conductive silver paste. Use this silver paste to prepare the front electrode of the solar cell by screen printing, and its various properties are shown in the attached table.

Embodiment 2 and comparative example 1

[0022] In Example 2 and Comparative Example 1, the preparation process of the conductive silver paste and the front electrode preparation process are similar to Example 1, except that the content w of the thixotropic polyamide wax is changed. The composition and performance results are shown in Table 1.

Embodiment 3

[0024] Take by weighing silver powder 88g, glass powder 3g, organic vehicle (its component and percentage by weight are: ethyl cellulose 8%, terpineol 52.6%, butyl carbitol acetate 27.2%, dibutyl phthalate 12%, fumed silica 0.2%) 9g, mixed evenly and then centered and ground on a three-roll mill to obtain a conductive silver paste. Use this silver paste to prepare the front electrode of the solar cell by screen printing, and its various properties are shown in the attached table.

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PUM

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Abstract

The invention discloses conductive silver paste for a front electrode of a solar battery. The conductive silver paste comprises the following ingredients by weight percentage: 70-90% of silver powder, 2-10% of glass powder and 5-20% of organic carrier. The invention further discloses a preparation method of the conductive silver paste for the front electrode of the solar battery. The conductive silver paste for the front electrode of the solar battery has good thixotropy; after silk-screen printing, the obtained front electrode of the solar battery is small in width and great in height, that is, an aspect ratio of an electrode grid line is high, so that the front lightproof area of the solar battery is small; and the solar battery has good performance.

Description

technical field [0001] The invention relates to a material for a solar cell electrode, in particular to a conductive silver paste for a front electrode of a solar cell, and also relates to a preparation method of the conductive silver paste. Background technique [0002] As a clean energy, solar energy has been applied in power generation, hot water, drying, refrigeration, heating and other fields, among which solar cells are the earliest developed and most widely used. According to different semiconductor materials, solar cells can be divided into: silicon-based solar cells, thin-film solar cells and organic solar cells, etc., and silicon-based solar cells are the leading products in the current market. [0003] A silicon-based solar cell is composed of a p-type silicon substrate, an n-type layer, an anti-reflection film, a front silver electrode, an aluminum back field electrode and a back silver electrode. Anti-reflection coating is formed on top. [0004] Silver paste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00
Inventor 邓建国彭娟纪兰香马春彦白小峰
Owner CHINA ACADEMY OF ENG PHYSICS FUNCTION MATERIAL RES INST
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