Solar Cell Front Electrode Shading Loss Reduction
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Solution Overview
Problem
Conventional solar cells face challenges with low conversion efficiency and short lifetimes due to high shading loss from the front electrode structure, which limits their industrialization and increases manufacturing costs.
Innovation Solution
A solar cell design featuring a front electrode pattern with a bus bar electrode, narrower connecting electrodes, and auxiliary electrodes to minimize shading loss and optimize light incidence, including a textured surface for improved light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the front electrode structure uses conventional bus bar and finger electrode patterns, then electrical connection is achieved, but shading loss increases and light absorption decreases
Solution Approach 1:
The front electrode is segmented into multiple functional components: bus bar electrodes for main current collection, connecting electrodes for electrical connection, and auxiliary electrodes for additional current collection. This segmentation allows optimization of each component's position and size to minimize shading while maintaining electrical performance
Solution Approach 2:
Different regions of the front electrode are designed with different properties: bus bar electrodes have larger width for low resistance, connecting electrodes have optimized width for balance between connection and shading reduction, and auxiliary electrodes are positioned strategically to collect current from specific regions without blocking light
2Reliability
If the front electrode width is increased to reduce electrical resistance, then conductivity improves, but light incident area decreases
Solution Approach 1:
The widths of different electrode components are optimized to different values: bus bar electrodes maintain larger widths (e.g., 2-5 mm) for low resistance, while connecting electrodes use smaller widths (e.g., 0.5-2 mm) to reduce shading. This parameter optimization balances electrical conductivity with light absorption area
3Productivity
If the number of finger electrodes is increased to improve current collection, then electrical performance improves, but manufacturing complexity and cost increase
Solution Approach 1:
The auxiliary electrodes serve multiple functions: they collect current from regions not covered by finger electrodes, provide additional current collection paths, and can be configured in various patterns to adapt to different cell designs. This multi-functionality improves current collection without proportionally increasing complexity
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 improved electrode structure reduces shading loss, enhances solar cell efficiency, and decreases material costs by allowing more light to penetrate while maintaining low electrical resistance.
Implementation Method 1
a photoelectric conversion layer and a front electrode on the photoelectric conversion layer
Data Source
AI summary
A solar cell includes a photoelectric conversion layer; and a front electrode on the photoelectric conversion layer, wherein the front electrode includes a plurality of first finger electrodes; a plurality of second finger electrodes; a bus electrode directly connected to at least one of the plurality of first finger electrodes; a plurality of connecting electrodes connected to the plurality of second finger electrodes, the plurality of connecting electrodes forming at least one space therebetween; and an auxiliary electrode formed at the at least one space, wherein the auxiliary electrode connects at least two connecting electrodes of the plurality of connecting electrodes.