Antimony Oxide Aluminum Paste for Solar Cell Bowing Control
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Solution Overview
Problem
Solar cell manufacturing faces challenges such as the bowing phenomenon and bubble generation due to the inherent reactivity of aluminum pastes with moisture, which affects the reliability and efficiency of solar cell modules, particularly when the aluminum paste is exposed to hot water during the sintering process.
Innovation Solution
An aluminum paste formulation including aluminum powder, antimony oxide, an organic vehicle, and glass frit, with antimony oxide present in specific weight percentages to prevent bowing and bubble formation, enhancing the paste's printability and adhesive strength while maintaining low inherent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum paste is used in solar cell manufacturing, then good electrical conductivity and adhesion are achieved, but bowing phenomenon and bubble generation occur due to reactivity with moisture
Solution Approach 1:
The patent introduces antimony oxide as an intermediary substance that mediates between the aluminum paste and moisture environment. The antimony oxide forms a protective barrier that prevents direct contact between aluminum and water, thereby eliminating bubble generation while maintaining the electrical and adhesive properties of the aluminum paste.
Solution Approach 2:
The patent converts the harmful reactivity of aluminum with moisture into a beneficial effect by using antimony oxide to control the reaction. The antimony oxide reacts with moisture first, forming a protective layer that actually protects the aluminum from further harmful reactions, thus turning the potential harm into a protective mechanism.
2Reliability
If antimony oxide is added to aluminum paste, then bowing and bubble generation are suppressed, but paste composition complexity increases
Solution Approach 1:
The patent optimizes the concentration parameter of antimony oxide in the aluminum paste, specifying a precise range of 0.001-1.0 wt%. This parameter optimization ensures that the minimum effective amount is used to suppress bowing and bubble generation, thereby reducing composition complexity while maintaining reliability improvements.
Solution Approach 2:
The patent creates a composite material system by combining aluminum paste with antimony oxide in specific proportions. This composite approach integrates the beneficial properties of both materials - the electrical conductivity of aluminum and the moisture resistance of antimony oxide - while maintaining a relatively simple overall composition through optimized ratios.
3Manufacturing precision
If antimony oxide concentration is increased, then bowing suppression improves, but excessive antimony oxide may cause other issues
Solution Approach 1:
The patent establishes an optimal parameter range for antimony oxide concentration (0.001-1.0 wt%) that balances bowing suppression effectiveness with paste stability. This precise parameter control ensures that sufficient antimony oxide is present to prevent bowing while avoiding excessive concentrations that could destabilize the paste formulation.
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 antimony oxide in the aluminum paste effectively suppresses the bowing phenomenon and prevents bubble generation in hot water tests, improving the reliability and photoelectric conversion efficiency of solar cells.
Implementation Method 1
the inherent reactivity of aluminum pastes with moisture, which affects the reliability and efficiency of solar cell modules, particularly when the aluminum paste is exposed to hot water during the sintering process
Implementation Method 2
The use of antimony oxide in the aluminum paste effectively suppresses the bowing phenomenon and prevents bubble generation in hot water tests
Data Source
AI summary
An aluminum paste and a solar cell, the aluminum paste including aluminum powder; an organic vehicle; and antimony oxide, the antimony oxide being present in an amount of about 0.001 wt % to less than about 1.0 wt %, based on a total weight of the aluminum paste.