Solar Cell Protective Layer Tunneling Electrode Design
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Solution Overview
Problem
Conventional solar cells have low efficiency due to suboptimal design of layers and electrodes, which hinders their practical application as alternative energy sources.
Innovation Solution
A solar cell structure is enhanced with a semiconductor substrate, conductive type regions, a protective layer, and electrodes connected through a tunneling layer and insulating layer, optimizing the connection and passivation to improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional solar cell structures are used, then manufacturing is simpler, but photoelectric conversion efficiency is low
Solution Approach 1:
The solar cell structure is divided into multiple functional layers including a semiconductor substrate, conductive type regions, protective layers, tunneling layers, and insulating layers. Each layer serves a specific function to optimize photoelectric conversion while managing complexity through functional segmentation.
Solution Approach 2:
Different regions of the solar cell are designed with different properties: conductive type regions provide electrical conductivity, protective layers provide insulation and protection, and tunneling layers provide selective electron transport. This local differentiation of properties enhances overall efficiency while maintaining structured complexity.
2Reliability
If electrode connection is optimized, then electrical properties improve, but manufacturing complexity increases
Solution Approach 1:
Tunneling layers and insulating layers are introduced as intermediary structures between the semiconductor substrate and electrodes. These intermediaries enable reliable electrical connection while providing necessary isolation and protection, balancing manufacturing complexity with connection reliability.
Solution Approach 2:
The electrode connection structure uses composite material layers including conductive materials, insulating materials, and tunneling materials. This composite approach achieves superior electrical properties while managing manufacturing complexity through established material combinations.
3Productivity
If surface passivation is enhanced, then surface recombination is minimized, but device complexity increases
Solution Approach 1:
Protective layers and tunneling layers are formed on the semiconductor substrate before electrode fabrication. This preliminary passivation action minimizes surface recombination from the outset, protecting the substrate and enhancing photoelectric conversion efficiency while integrating seamlessly into the manufacturing process.
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 enhanced solar cell design increases photoelectric conversion efficiency by minimizing surface recombination and light loss, leading to improved electrical properties and efficiency.
Implementation Method 1
a protective layer on the conductive type region; and an electrode disposed on the protective layer and electrically connected to the conductive type region
Data Source
AI summary
A solar cell includes a semiconductor substrate; at least one conductive type region on the semiconductor substrate; a protective layer on the at least one conductive type region; and an electrode disposed on the protective layer and electrically connected to the conductive type region.