LiAlO2 Conductive Paste for Solar Cell Adhesion
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Solution Overview
Problem
Conventional conductive pastes for forming electrodes in solar cells exhibit insufficient adhesion strength to semiconductor substrates, leading to inferior solar cell performance in terms of photovoltaic conversion efficiency and fill factor.
Innovation Solution
Incorporation of LiAlO2 into the conductive paste composition, which includes a conductive metal, glass frit, and an organic medium, enhances the adhesion strength of the electrodes to the substrate, improving the electrical connection and performance of solar cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional conductive paste composition is used, then the electrode can be formed on semiconductor substrate, but the adhesion strength between electrode and substrate is insufficient
Solution Approach 1:
The patent applies composite materials by incorporating LiAlO2 particles into the conductive paste formulation. This creates a multi-component system where LiAlO2 serves as an adhesion promoter that forms strong chemical bonds with both the aluminum electrode and the silicon substrate, while the conductive metal particles maintain electrical conductivity. The composite paste composition achieves superior adhesion strength and bonding reliability compared to conventional single-component pastes.
2Strength
If LiAlO2 is incorporated into conductive paste, then adhesion strength is enhanced, but the complexity of paste composition increases
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration of LiAlO2 in the conductive paste to a specific range (0.1-5 wt%). This parameter optimization ensures that sufficient adhesion promoter is present to enhance bonding strength, while excessive amounts that would unnecessarily increase composition complexity are avoided. The controlled parameter range achieves the desired adhesion enhancement with minimal impact on paste formulation complexity.
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 addition of LiAlO2 significantly increases the adhesion strength of the electrodes to various semiconductor substrates, resulting in solar cells with comparable or better photovoltaic conversion efficiency and fill factor compared to LiAlO2-free conductive pastes.
Implementation Method 1
incorporation of LiAlO2 (lithium aluminate) therein... provides enhanced adhesion strength of an electrode prepared therefrom to a substrate
Implementation Method 2
the front side silver paste sinters and penetrates through an anti-reflective layer (e.g., SiNx film) during firing and thereby achieves electrical contact with a semiconductor substrate
Data Source
AI summary
The present invention relates to a conductive paste, which imparts an electrode formed therefrom with enhanced adhesion strength to a semiconductor substrate by incorporation of LiAlO2 (lithium aluminate) therein. The present invention further relates to an electrode formed from the conductive paste and a semiconductor and in particular, a solar cell comprising the electrode produced therefrom.