Solar Cell Electrode Segmentation for Charge Collection
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Solution Overview
Problem
Solar cells face efficiency issues due to the challenge of optimizing electrode area and configuration, which affects material usage and charge collection, leading to defects and reduced performance.
Innovation Solution
The design includes a solar cell configuration with a semiconductor substrate, dopant layers, anti-reflection films, and electrodes with connecting projections to enhance light absorption and collection, while minimizing defects and alignment errors, thereby improving efficiency and reducing the defect rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the area of electrode is excessively increased, then the amount of materials used increases, but the efficiency of solar cell deteriorates due to surface recombination
Solution Approach 1:
The electrode is divided into multiple segments or fingers that extend across the solar cell surface. This segmentation allows the electrode to cover sufficient area for material utilization while maintaining adequate spacing between segments to minimize surface recombination effects, thus resolving the contradiction between material quantity and cell efficiency
Solution Approach 2:
The electrode design implements local quality by varying the electrode width, spacing, or configuration in different regions of the solar cell. This allows optimization of material usage in specific areas while maintaining efficiency in other regions, addressing the trade-off between material quantity and performance
2Quantity of substance
If the area of electrode is excessively reduced, then the amount of materials used decreases, but sufficient collection of electric charge becomes difficult
Solution Approach 1:
The electrode is segmented into multiple fingers that collectively cover the necessary area for charge collection while using less total material than a single large electrode. This segmentation enables sufficient charge collection capability with reduced material quantity
Solution Approach 2:
The electrode design transitions from a single large planar area to multiple narrow fingers distributed across the surface. This dimensional reconfiguration allows the electrode to maintain adequate collection area while reducing total material usage through optimized spatial distribution
3Ease of manufacture
If the configuration of electrode is not optimized, then manufacturing is simplified, but defects increase and performance is reduced
Solution Approach 1:
The electrode configuration optimizes parameters such as finger width, spacing, and pattern geometry to achieve a balance between manufacturing simplicity and defect reduction. By carefully selecting these parameters, the design maintains ease of fabrication while minimizing defects and performance issues
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
This configuration increases the open-circuit voltage and short-circuit current, enhances light absorption, and reduces defects, resulting in improved solar cell efficiency and reliability.
Implementation Method 1
anti-reflection films
Implementation Method 2
dopant layers
Implementation Method 3
solar cells are popular next generation cells to convert sunlight into electrical energy
Data Source
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AI summary
Disclosed is a solar cell including a semiconductor substrate, an emitter layer formed at the semiconductor substrate, the emitter layer being a conductive type different from that of the semiconductor substrate, a back surface field layer formed at the semiconductor substrate, the back surface field layer being the same conductive type as that of the semiconductor substrate, a first electrode electrically connected to the emitter layer, and a second electrode electrically connected to the back surface field layer. The second electrode includes a plurality of finger electrodes arranged at a first pitch, the back surface field layer includes a plurality of first portions corresponding to the respective finger electrodes, and at least one connecting projection protrudes from any one of each finger electrode and each first portion.