Conductive Paste Oxide Additive for Solar Cell Resistance
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Solution Overview
Problem
There is a need for improvements in the production of photovoltaic solar cells, particularly in terms of efficiency, open cell voltage, fill factor, and series resistance, especially for n-type solar cells.
Innovation Solution
A conductive paste composition comprising at least 70 wt.% Ag particles, a non-crystalline glass, and a crystalline oxide additive with specific elements such as V, Nb, Ta, Cr, Mo, and Bi, which is applied to a Si wafer and fired to form solar cells, enhancing electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electro-conductive paste is used, then the basic electrode function is achieved, but the series resistance is high and efficiency is low
Solution Approach 1:
The patent changes the chemical composition parameters of the electro-conductive paste by incorporating specific metal powders (Al, Cu, Ni, Pd, Pt) and metal oxides (Al2O3, SiO2, TiO2, ZnO, B2O3, PbO, Bi2O3) in optimized ratios. This compositional parameter change reduces series resistance and improves electrical conductivity while maintaining the electrode's basic function
Solution Approach 2:
The patent uses a composite material system combining Ag particles with multiple metal powders and glass frits. This composite structure creates multiple conduction pathways and improves overall electrical conductivity, reducing series resistance while maintaining the electrode's mechanical and electrical functions
2Object-affected harmful factors
If the paste composition is optimized for conductivity, then series resistance decreases, but the manufacturing complexity increases
Solution Approach 1:
The patent combines multiple functional components (conductive metals, oxide frits, glass matrices) into a single integrated paste formulation. This merging approach achieves reduced series resistance through synergistic interactions while simplifying the manufacturing process by using a unified paste application method rather than multiple separate steps
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 improves the electrical properties of solar cells, including efficiency, open cell voltage, and fill factor, by using a conductive paste composition that effectively forms electrodes with improved conductivity and reduced series resistance.
Implementation Method 1
A conductive paste composition comprising at least 70 wt.%, Ag particles, a non-crystalline glass and a crystalline oxide additive... which is applied to a Si wafer and fired to form solar cells
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 an electro-conductive paste comprising an oxide additive and solar cells obtainable therefrom. More specifically, the present invention relates to electro-conductive pastes, solar cell precursors, processes for preparation of solar cells, solar cells and solar modules. The present invention relates to a conductive paste composition comprising the following paste constituents:a. at least about 70 wt. % Ag particles, based on the paste;b. a vehicle;c. a glass;d. an oxide additive comprising MI, MII, and O;wherein MI and MII are different;wherein MI is selected from the group consisting of: V, Nb, Ta, Cr, Mo, W, Ge, As, Sb, Se, Te, Pb and Bi;wherein MII is selected from the group consisting of: V, Nb, Ta, Cr, Mo, W, Ge, As, Sb, Se, Te, Pb, Bi, Mn, Ce, Zn, Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba;wherein the oxide additive is crystalline according to electron back scattering diffraction (EBSD) measurement.