Stepped Front Electrode for Solar Cell Adhesion
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Solution Overview
Problem
Existing solar cell electrodes face challenges in achieving strong adhesion to ribbons without compromising electrical properties, particularly due to limitations in surface morphology and the addition of materials that can affect contact resistance.
Innovation Solution
A front electrode with a stepped structure on its outermost surface, composed of multiple stages with varying silver content, formed by baking a composition of silver powder, glass frit, and organic vehicle, which enhances adhesion to ribbons without additional components, improving electrical properties and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional flat electrode surface is used, then the manufacturing process is simple, but the adhesion to ribbons is insufficient
Solution Approach 1:
The electrode surface is transformed from a flat plane to a stepped structure with multiple levels and curved surfaces. This curvature creates mechanical interlocking with the ribbon, significantly improving adhesion strength while the stepped design maintains manufacturing feasibility through conventional baking processes.
2Strength
If additional components are added to improve adhesion, then adhesion to ribbons is enhanced, but electrical properties deteriorate
Solution Approach 1:
Instead of adding new materials, the invention changes the physical parameters of the existing electrode structure by creating a stepped surface morphology. This structural parameter change improves adhesion through mechanical interlocking while preserving the electrical conductivity of the original electrode material composition.
3Strength
If the electrode surface area is increased to improve adhesion, then adhesion to ribbons is enhanced, but the contact resistance increases
Solution Approach 1:
The electrode surface is segmented into multiple stepped levels, creating numerous small contact points distributed across the surface. This segmentation increases the total adhesion area through mechanical interlocking while maintaining low contact resistance by distributing current flow across multiple parallel contact paths.
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 stepped structure significantly improves adhesion to ribbons while maintaining excellent electrical properties, enhancing the reliability and conversion efficiency of solar cells without adding materials that could deteriorate performance.
Implementation Method 1
Solar cells generate electricity using the photovoltaic effect of a p-n junction, which converts photons (e.g., of sunlight) into electricity
Implementation Method 2
The front electrode may be formed by baking a composition that includes silver powder, a glass frit, and an organic vehicle
Data Source
AI summary
A front electrode for solar cells and a solar cell, the front electrode including a stepped structure at an outermost surface thereof, wherein the stepped structure is composed of n stages, in which n is an integer of 3 or greater, and an nth stage has a smaller cross-sectional area than an (n−1)th stage such that the (n−1)th stage is partially exposed, and the stepped structure occupies about 5% to about 100% of a total surface area of the outermost surface.