Solar Cell Electrode Paste with Multi-Group Conductive Particles
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Solution Overview
Problem
Existing solar cell electrode pastes face challenges in achieving consistent sintering conditions and conversion efficiency due to variations in wafer and process conditions, leading to increased contact resistance and reduced sintering margins.
Innovation Solution
A paste composition for solar cell electrodes is developed, comprising conductive particles with specific particle diameter distributions, a glass frit, and an organic binder, which includes multiple groups of conductive particles with tailored size distributions to optimize sintering and reduce contact resistance, thereby widening the optimal sintering temperature range and improving conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional paste composition is used, then manufacturing process is simple, but sintering efficiency scatters significantly (0.15 or more) in temperature range 900-930°C
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size distribution of conductive particles, specifically setting D50 between 1.0-1.85 μm and D90 between 2.0-3.10 μm. This parameter optimization ensures that the paste composition maintains scattering of efficiency 0.15 or less across the sintering temperature range of 900-930°C, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent uses composite materials by combining conductive particles with specific size distributions (D50: 1.0-1.85 μm, D90: 2.0-3.10 μm) with glass frit and organic binder. This composite formulation creates a paste composition that achieves consistent sintering efficiency (scattering ≤0.15) across varying temperatures, while the composite structure itself manages the complexity through integrated material design.
2Reliability
If single particle size conductive particles are used, then paste composition is simple, but contact resistance increases and sintering margin narrows
Solution Approach 1:
The patent applies local quality by creating different particle size groups within the conductive particle system. The first group has D50 of 1.0-1.85 μm and the second group has D50 of 2.0-3.10 μm, with each group serving specific local functions in the sintering process. This local differentiation reduces contact resistance and widens sintering margin while maintaining manageable complexity through structured quality variation.
3Adaptability or versatility
If optimal sintering conditions are strictly controlled, then conversion efficiency is maximized, but process adaptability to wafer variations decreases
Solution Approach 1:
The patent applies universality by designing a paste composition that functions effectively across a broad sintering temperature range (900-930°C). The multi-group conductive particle system with specific size distributions enables the paste to adapt to different wafer conditions and process variations while maintaining consistent performance, achieving both adaptability and precision simultaneously.
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 composition achieves a scattering of efficiency of 0.15 or less in the sintering temperature range of 900°C to 930°C, maintaining high average efficiency while providing a wider sintering margin and enhancing process stability.
Implementation Method 1
A paste composition for solar cell electrodes, an electrode fabricated using the same, and a solar cell including the same
Data Source
AI summary
A paste composition for solar cell electrodes includes conductive particles, a glass frit, an organic binder and a solvent. The conductive particles include at least two groups of conductive particle having different particle diameter distributions. The conductive particle may have an average particle diameter (D50′) of about 1.85 μm or less and a particle diameter (D90′) at 90% of the cumulative particle diameter distribution of about 3.10 μm or less.