A kind of silver powder for solar cell conductive silver paste and its preparation and application

A technology of solar cells and conductive silver paste, which is applied in transportation and packaging, metal processing equipment, etc., can solve the problems of large silver loss, cumbersome process, and unsuitable silver powder particle size, and achieve high activity, narrow sintering temperature range, and high photoelectricity The effect of conversion efficiency

Active Publication Date: 2019-01-01
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the literature reports in the past are to use a strong reducing agent to prepare nano-silver powder as a seed crystal, and then use a medium-power reducing agent to prepare silver powder after cleaning and transfer. The process is cumbersome and the silver loss is large. front silver for solar cells

Method used

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  • A kind of silver powder for solar cell conductive silver paste and its preparation and application
  • A kind of silver powder for solar cell conductive silver paste and its preparation and application
  • A kind of silver powder for solar cell conductive silver paste and its preparation and application

Examples

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Effect test

Embodiment 1

[0022] First prepare 0.5 mol / L silver nitrate solution as silver source, adjust its pH to 5 with nitric acid; secondly prepare 1.5 mol / L ascorbic acid solution, and add polyvinyl alcohol with 1% silver nitrate mass; redox reaction step by step, in The reaction temperature was 20°C, and the stirring rate was 100 r / min. First, 0.2 times the volume of the total silver source was quickly added to the reducing solution, and 10% oleic acid of the mass of silver nitrate was added; then the remaining silver source was added with Slowly add 5 ml / min to the reducing solution. During the dropping process, use ammonia water or nitric acid to control the pH of the solution to 3. After the dropping is completed, react for 30 minutes, pour out the supernatant, and wash with deionized water and absolute ethanol respectively. 3 times and dried in an oven at 60°C for 4 h.

Embodiment 2

[0024] First prepare 1.0 mol / L silver nitrate solution as the silver source, adjust its pH to 1 with nitric acid; secondly prepare 3.0 mol / L ascorbic acid solution, and add gum arabic with 4% silver nitrate mass; carry out the redox reaction step by step. At a temperature of 30°C and a stirring rate of 50 r / min, 0.5 times the volume of the total silver source was quickly added to the reducing solution, and 6% oleic acid of the mass of silver nitrate was added; ml / min slowly added dropwise to the reducing solution. During the dropping process, the pH of the solution was controlled to be 4 with ammonia water or nitric acid. After the dropwise addition was completed, the reaction was continued for 30 min. and dried in an oven at 60°C for 4 h.

Embodiment 3

[0026] First prepare 2.5 mol / L silver nitrate solution as silver source, adjust its pH to 3 with nitric acid; secondly prepare 0.5 mol / L ascorbic acid solution, and add methyl cellulose with 10% silver nitrate mass; carry out redox reaction step by step, At a reaction temperature of 50°C and a stirring rate of 1000 r / min, quickly add 0.3 times the volume of the total silver source to the reducing solution, and add 1% oleic acid to the mass of silver nitrate; then add the remaining silver source Slowly add dropwise to the reducing solution at 1 ml / min. During the dropwise addition, use ammonia water or nitric acid to control the pH of the solution to 2. After the dropwise addition is complete, react for 30 minutes. Pour out the supernatant, and use deionized water and absolute ethanol Wash three times and dry in an oven at 60°C for 4 h.

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Abstract

The invention provides a kind of silver powder for solar cell conductive silver paste and its preparation and application. Silver nitrate solution is prepared as a silver source, and its pH is adjusted to 1-5 with ammonia water or nitric acid; 0.6-1.2 times ascorbic acid is taken by weighing silver nitrate quality, Prepare ascorbic acid solution and add a dispersant; redox reaction step by step: quickly add a part of the silver source to the reducing solution under heating and stirring, immediately add oleic acid, and then slowly drop the remaining silver source to the reducing solution, During the dropping process, use nitric acid or ammonia water to control the pH of the solution, and react for 30 min after the dropping is completed; after the reaction, pour out the supernatant, wash with deionized water and absolute ethanol three times, and dry in an oven at 60°C 4 h. In this method, the formation of silver nuclei and grain growth are carried out step by step by adding silver source to the reducing solution step by step, and oleic acid is added during the dropping process to effectively control the grain size. silver dust. It can be used to prepare conductive silver paste for solar cells to achieve high photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to a preparation method of silver powder, in particular to a silver powder for solar cell conductive silver paste and its preparation and application. Background technique [0002] In the electronics industry, the method of printing and sintering to form a film is called a thick film process, and the paste used is called a thick film paste. According to the definition, conductive silver paste for crystalline silicon solar cells belongs to thick film paste. The components of conductive silver paste mainly include silver powder, inorganic glass powder, organic carrier and dopant, and the content of silver powder is usually greater than 80% (mass percentage). Therefore, the performance of the silver powder will directly or indirectly affect the performance of the conductive paste and the thick-film electrode after sintering. Generally speaking, if the particle size is too large, it cannot completely pass through the screen during pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/065
Inventor 何丹农章龙林琳葛美英张芳尹桂林张春明金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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