Halogen-Modified Conductive Paste for High Ohmic Solar Wafers
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Solution Overview
Problem
Solar cells based on high Ohmic wafers with high sheet resistance face challenges in achieving low contact resistance between electrodes and wafers, which affects their performance.
Innovation Solution
A solar cell precursor comprising a wafer with a sheet resistance of at least 80 Ohm/sq., an electro-conductive paste containing metallic particles, glass frit, an organic vehicle, and a halogen containing compound, applied to the wafer to reduce contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high Ohmic wafers with high sheet resistance are used, then cell performance is improved, but contact resistance between electrodes and wafers increases
Solution Approach 1:
The patent modifies the chemical composition parameters of the electro-conductive paste by incorporating halogen-containing compounds (such as PbCl2, AgCl, ZnCl2) in specific concentrations (0.1-10 wt%). This changes the chemical reactivity parameters of the paste, enabling it to form lower resistance contacts with high Ohmic wafers during the firing process while maintaining the beneficial high sheet resistance properties of the wafer for improved cell performance
Solution Approach 2:
The patent creates a composite electro-conductive paste material that combines traditional paste components (metallic particles, glass frit, organic vehicle) with halogen-containing compounds. This composite material exhibits enhanced chemical reactivity and bonding characteristics that enable effective electrical contact with high Ohmic wafers, resolving the contact resistance issue while preserving the wafer's high performance characteristics
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 solution effectively reduces contact resistance between electrodes and wafers, enhancing the performance of solar cells by improving electrical conductivity and adhesion, leading to more efficient energy conversion.
Implementation Method 1
an electro-conductive paste containing metallic particles, glass frit, an organic vehicle, and a halogen containing compound, applied to the wafer to reduce contact resistance
Implementation Method 2
Solar cells are devices that convert the energy of light into electricity using the photovoltaic effect
Data Source
AI summary
In general, the present invention relates to electro-conductive pastes with halogen containing compounds as additives and solar cells with high Ohmic sheet resistance, preferably photovoltaic solar cells. More specifically, the present invention relates to solar cell precursors, processes for preparation of solar cells, solar cells and solar modules. The present invention relates to a solar cell precursor at least comprising as precursor parts:i) a wafer with sheet resistance of at least 80 Ohm/sq.;ii) an electro-conductive paste at least comprising: a) metallic particles;b) a glass frit;c) an organic vehicle; andd) a halogen containing compoundapplied to the wafer.