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Silver powder for solar cell conductive silver pulp and preparation and application

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

Active Publication Date: 2017-03-22
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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  • Silver powder for solar cell conductive silver pulp and preparation and application
  • Silver powder for solar cell conductive silver pulp and preparation and application
  • Silver powder for solar cell conductive silver pulp and preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 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

[0025] 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

[0027] 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 silver powder for solar cell conductive silver pulp and preparation and application. A silver nitrate solution is prepared and used as a silver source, and the pH of the silver nitrate solution is adjusted to 1-5 with ammonia water or nitric acid; ascorbic acid of which the mass is 0.6-1.2 times that of the silver nitrate is weighed, an ascorbic acid solution is prepared, and a dispersant is added; a redox reaction is conducted step by step; a part of silver source is quickly added to a redox under heating and stirring, oleic acid is added immediately, then the rest of the silver source is slowly added to the redox dropwise, the pH of the solution is controlled with the nitric acid or the ammonia water in the drop-by-drop adding process, and a reaction is conducted for 30 minutes after drop-by-drop adding is completed; and after the reaction is completed, supernatant is poured out and cleaned three times with deionized water and absolute ethyl alcohol, and then the supernatant is dried for 4 hours at the temperature of 60 DEG C. By the adoption of the method, the silver source is added to the redox step by step, the purpose of step-by-step implementation of silver nucleation and grain growth is achieved, and the oleic acid is added in the drop-by-drop adding process so that the grain size can be controlled effectively, and the silver powder with the narrow grain size distribution range and average grain size is prepared. The silver powder can be used for preparing the solar cell conductive silver pulp, and the high photovoltaic conversion efficiency is achieved.

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 Applications(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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