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Silver conductive paste used for positive electrode of solar battery and preparation technique thereof

A silver conductor paste, solar cell technology, applied in conductors, conductive materials dispersed in non-conductive inorganic materials, conductive materials, etc. High conversion efficiency, reduced contact resistance, large open-circuit voltage and short-circuit current

Inactive Publication Date: 2009-12-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this is only to improve the performance of the battery from the perspective of the glass phase, which limits the continued development of silver conductor paste for solar cell electrodes

Method used

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  • Silver conductive paste used for positive electrode of solar battery and preparation technique thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation process steps of the silver conductor paste for the front electrode of the solar cell are as follows:

[0034] Silver powder prepared by chemical reduction method: AgNO with a concentration of 20% 3 Solution, adjust the pH value to 8 with ammonia water to form a silver ammonia solution, add 10% reducing agent hydrazine hydrate and 1% dispersant gelatin into the silver ammonia solution and react until no gas is released, filter, and vacuum dry . When AgNO 3 When the proportioning ratio of hydrazine hydrate and gelatin is 26:72:2 [volume ratio], silver powder with a particle size range of 5-10 microns is obtained; when AgNO 3 When the proportioning ratio of hydrazine hydrate and gelatin is 40:56:4 [volume ratio], silver powder with a particle size range of 0.1 to 2 microns is obtained.

[0035] Preparation of glass powder by smelting method: weigh 64.9g of PbO, B 2 o 3 3.5g, SiO 2 24.8g, ZnO 2.7g, TiO 0.7g, Al 2 o 3 3.4g, and fully mixed and put...

Embodiment 2

[0039] The preparation process steps of the silver conductor paste for the front electrode of the solar cell are as follows:

[0040] Silver powder prepared by chemical reduction method: AgNO with a concentration of 20% 3 Solution, adjust the pH value to 8 with ammonia water to form a silver ammonia solution, add 10% reducing agent hydrazine hydrate and 1% dispersant gelatin into the silver ammonia solution and react until no gas is released, filter, and vacuum dry . When AgNO 3 When the proportioning ratio of hydrazine hydrate and gelatin is 26:72:2 [volume ratio], silver powder with a particle size range of 5-10 microns is obtained; when AgNO 3 When the proportioning ratio of hydrazine hydrate and gelatin is 40:56:4 [volume ratio], silver powder with a particle size range of 0.1 to 2 microns is obtained.

[0041] Preparation of glass powder by smelting method: weigh 64.9g of PbO, B 2 o 3 3.5g, SiO 2 24.8g, ZnO 2.7g, TiO 0.7g, Al 2 o 3 3.4g, and fully mixed and put...

Embodiment 3

[0045] The preparation process steps of the silver conductor paste for the front electrode of the solar cell are as follows:

[0046] Silver powder prepared by chemical reduction method: AgNO with a concentration of 20% 3 Solution, adjust the pH value to 8 with ammonia water to form a silver ammonia solution, add 10% reducing agent hydrazine hydrate and 1% dispersant gelatin into the silver ammonia solution and react until no gas is released, filter, and vacuum dry . When AgNO 3 When the proportioning ratio of hydrazine hydrate and gelatin is 26:72:2 [volume ratio], silver powder with a particle size range of 5-10 microns is obtained; when AgNO 3 When the proportioning ratio of hydrazine hydrate and gelatin is 40:56:4 [volume ratio], silver powder with a particle size range of 0.1 to 2 microns is obtained.

[0047] Preparation of glass powder by smelting method: weigh 64.9g of PbO, B 2 o 3 3.5g, SiO 2 24.8g, ZnO 2.7g, TiO 0.7g, Al 2 o 3 3.4g, and fully mixed and put...

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Abstract

The invention provides a silver conductive paste used for positive electrode of solar battery and a preparation technique thereof. The paste comprises silver powder, glass powder, an organic carrier and an additive, wherein the silver powder accounts for 65 to 85 percent of the total weight of the paste and consists of two types of silver powder with different particle sizes; the first type of silver powder has the particle size range of 3 to 15 micrometers and is spherical; the second type of silver powder has the particle size range of 0.1 to 3 micrometers and is spherical; the first type of silver powder accounts for 20 to 50 percent of the total silver powder; the glass powder is of Pb-B-Si-Zn-Ti-Al-O series and accounts for 1 to 10 percent of the total weight of the paste; the organic carrier accounts for 10 to 20 percent of the total weight of the paste; and the additive accounts for 0.1 to 3 percent of the total weight of the paste, and consists of BaO powder and CaO powder. The silver powder with different particle size ranges is mutually filled, thus greatly improving the electrical property of the electrode and improving the photoelectric conversion efficiency of the battery. In addition, the invention can ensure good ohmic contact between the paste and a substrate.

Description

technical field [0001] The invention relates to a silver conductor paste for a front electrode of a solar cell and a preparation process thereof. Background technique [0002] Conductive paste is a kind of electronic paste, which generally consists of conductive functional phase, binder phase and organic carrier. The conductive phase can be metal powder with good electrical and thermal conductivity such as gold, silver, platinum, and palladium, and the bonding phase is glass powder. Silver powder is widely used as the functional phase of conductive paste due to its good electrical and thermal conductivity and its low price compared to other precious metals. Traditional silver conductor paste is mainly used to form thick film circuits on ceramic substrates and ceramic components by screen printing. Due to the rapid development of solar cells in recent years, silver conductor paste has been widely used to make front electrodes of solar cells due to its advantages of low cost...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18H01B1/00H01B1/02H01B1/16H01B1/22
CPCY02P70/50
Inventor 甘卫平向锋张金玲郭桂全周华刘欢
Owner CENT SOUTH UNIV
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