Lead-Tellurium Oxide Paste for Solar Cell Contacts
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Solution Overview
Problem
Existing electroconductive paste compositions for solar cells exhibit high contact resistance and recombination issues due to the insulating effect of glass frits, which hinder efficient energy conversion and require improved thermal and reactivity properties.
Innovation Solution
An inorganic reaction system comprising a lead-containing matrix composition and a tellurium-containing matrix composition, with specific weight ratios and formulations, is used to create a reactive media that enhances Ohmic and Schottky contact between metal conductors and silicon substrates, reducing contact resistance and improving solar cell performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass frits are used in electroconductive paste compositions, then the paste provides structural support and adhesion, but the insulating effect of glass frits increases contact resistance
Solution Approach 1:
The patent extracts and removes the harmful insulating glass frit component from the paste composition, replacing it with an inorganic reaction system based on lead-tellurium-oxide eutectic composition that provides both adhesion and electrical conductivity without the insulating barrier effect
Solution Approach 2:
The patent changes the chemical composition parameters of the inorganic matrix from traditional glass frits to a specific lead-tellurium-oxide eutectic composition (60-80 wt% PbO, 20-40 wt% TeO2), which fundamentally alters the electrical properties from insulating to conductive while maintaining adhesion functionality
2Productivity
If traditional glass frit compositions are used, then the paste maintains structural integrity, but thermal and reactivity properties require improvement for efficient energy conversion
Solution Approach 1:
The patent utilizes the specific eutectic composition parameters of lead-tellurium-oxide (60-80 wt% PbO, 20-40 wt% TeO2) which melts at a lower temperature and exhibits enhanced reactivity, thereby improving thermal behavior and energy conversion efficiency without compromising structural integrity
Solution Approach 2:
The patent creates a composite inorganic reaction system combining lead oxide and tellurium oxide in specific ratios, forming a material with optimized thermal and reactivity properties that enhances energy conversion while maintaining structural stability during firing
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 inorganic reaction system provides lower contact resistance and better overall solar cell performance by optimizing the reactivity and thermal behavior of the paste, leading to improved efficiency and reliability of the solar cells.
Implementation Method 1
an inorganic reaction system for use in electroconductive paste compositions
Implementation Method 2
optimizing the reactivity and thermal behavior of the paste
Data Source
AI summary
This disclosure relates to electroconductive paste formulations useful in solar panel technology. In one aspect, the disclosure relates to an inorganic reaction system for use in electroconductive paste compositions, wherein the inorganic reaction system comprises a lead containing matrix composition and a tellurium containing matrix composition. In another aspect, the disclosure relates to an electroconductive paste composition comprising a conductive metal component, an inorganic reaction system and an organic vehicle. Another aspect of the disclosure relates to a solar cell produced by applying an electroconductive paste composition of the invention to a silicon wafer. Yet another aspect relates to a solar cell module assembled using solar cells produced by applying an electroconductive paste composition to a silicon wafer, wherein the electroconductive paste composition comprises an conductive metal component, an inorganic reaction system and an organic vehicle.