Solar Cell Electrode Segmentation for Resistance Reduction
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Solution Overview
Problem
Current solar cell technologies face inefficiencies in energy conversion due to limitations in electrode design and manufacturing processes, which affect the overall performance and efficiency of solar cells.
Innovation Solution
The solar cell design incorporates a p-n junction structure with specific electrode layer densities and materials, including a first electrode layer, auxiliaries, and a current collector layer, formed using a screen printing method and light-induced plating process, to enhance electrical conductivity and light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode design is used, then manufacturing is simpler, but interconnect resistance is higher and efficiency is lower
Solution Approach 1:
The electrode is divided into multiple functional layers: a first electrode layer in contact with the emitter, a second electrode layer with higher density for improved conductivity, and auxiliary electrodes separated from the main layer. This segmentation allows each layer to perform its specific function optimally, reducing overall interconnect resistance while maintaining manufacturability through standardized layering processes.
Solution Approach 2:
The second electrode layer is positioned specifically on the upper and lateral surfaces of the first electrode layer and auxiliaries, creating localized high-density conductive regions where current collection is most critical. This local quality enhancement targets the specific areas needing improved electrical performance without uniformly increasing complexity throughout the entire electrode structure.
2Reliability
If more electrode material is used, then conductivity improves, but light absorption decreases
Solution Approach 1:
High-density electrode material is concentrated on the lateral surfaces and upper surfaces where current collection is most effective, rather than uniformly distributing material across the entire electrode area. This localized placement maximizes conductivity where needed while minimizing the electrode's shadowing effect on light absorption in the active cell areas.
Solution Approach 2:
The electrode structure extends into the lateral dimension with the second layer wrapping around the sides of the first layer and auxiliaries. This three-dimensional configuration increases the effective conductive surface area for current collection without proportionally increasing the top-down footprint that would block light from reaching the semiconductor layers.
3Reliability
If auxiliary electrodes are added, then carrier transfer improves, but manufacturing complexity increases
Solution Approach 1:
The electrode system is segmented into main electrode layers and separate auxiliary electrodes that are physically detached from the primary structure. These auxiliaries are positioned strategically to collect carriers from specific regions, improving overall transfer efficiency. The segmentation allows for modular manufacturing where each component can be formed and positioned independently using standard screen printing and plating techniques.
Solution Approach 2:
The auxiliary electrodes serve as intermediary structures that facilitate carrier collection from the emitter layer to the main electrode layers. By providing additional collection points and pathways, they mediate the charge transfer process, improving efficiency without requiring complete redesign of the fundamental manufacturing workflow.
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 design improves the efficiency of solar cells by reducing interconnect resistance, increasing light incidence, and enhancing carrier transfer rates, leading to improved energy conversion and reduced material waste.
Implementation Method 1
forming a first electrode pattern including an electrode layer pattern on the anti-reflection layer, forming a second electrode pattern on the substrate, forming a plurality of first electrode layers connected to the emitter layer and a plurality of first electrode auxiliaries connected to the emitter layer using the electrode layer pattern and forming a second electrode connected to the substrate using the second electrode pattern, and performing a plating process using the plurality of first electrode layers and the plurality of first electrode auxiliaries as a seed layer to form a plurality of second electrode layers
Implementation Method 2
When light is incident on the solar cell, a plurality of electron-hole pairs are generated in the semiconductors. The electron-hole pairs are separated into electrons and holes by the photovoltaic effect.
Data Source
AI summary
A solar cell includes a first conductive type substrate; an emitter layer of a second conductive type opposite the first conductive type, the emitter layer and the substrate forming a p-n junction; an anti-reflection layer positioned on the emitter layer; a plurality of first electrodes passing through the anti-reflection layer and being electrically connected to the emitter layer, at least one of the plurality of first electrodes including: a first electrode layer and a plurality of first electrode auxiliaries separated from the first electrode layer and positioned around the first electrode layer; and a second electrode layer positioned on the first electrode layer and on the plurality of first electrode auxiliaries; and a second electrode electrically connected to the substrate.