Solar Cell Electrode Paste Silver Particle Specific Surface Area
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Solution Overview
Problem
The power generation efficiency of solar cells is limited by the resistance value of the electrode, and existing methods do not effectively optimize the specific surface area of silver particles, which affects the adhesive strength and overall performance.
Innovation Solution
A conductive paste for solar cell electrodes comprising silver particles with a specific surface area of 0.20-0.60 m2/g, glass frit, and resin binder, where silver particles constitute 80 mass % or more, is used to improve power generation efficiency by optimizing the electrode's properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If silver particles with small specific surface area are used, then power generation efficiency is improved, but adhesive strength may deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the specific surface area of silver particles within the range of 0.20-0.60 m2/g. This parameter optimization resolves the contradiction by identifying the optimal range where power generation efficiency is maximized while adhesive strength remains adequate, transforming the quality of silver particles to achieve both goals simultaneously.
2Strength
If silver particles with large specific surface area are used, then adhesive strength is improved, but power generation efficiency deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of specific surface area to a specific range (0.20-0.60 m2/g) that optimizes power generation efficiency. This demonstrates that there exists an optimal parameter range where the contradiction is resolved, and deviations in either direction cause deterioration of one or both properties.
3Strength
If silver particle size is reduced to increase specific surface area, then adhesive strength increases, but resistance value decreases
Solution Approach 1:
The patent applies parameter changes by controlling the specific surface area within the optimal range of 0.20-0.60 m2/g, which corresponds to specific particle size ranges. This resolves the contradiction by identifying the precise parameter window where adhesive strength is sufficient while resistance value remains low, achieving both objectives without compromise.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of silver particles with a specific surface area of 0.20-0.60 m2/g in the conductive paste enhances the power generation characteristics of solar cells, including conversion efficiency, serial resistance, fill factor, open voltage, short circuit current, and shunt resistance, while maintaining adequate adhesive strength.
Implementation Method 1
firing the applied conductive paste
Data Source
AI summary
In a paste for a solar cell light-receiving surface electrode including silver particles, glass frit, resin binder, and thinner, silver particles with a specific surface of 0.20-0.60 m2/g are used as the silver particles. The silver particles are preferably included at 80 mass % or more to the total amount of silver particles being included in the paste.