Optoelectronic Device Contact Layer Configuration for Light Extraction
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Solution Overview
Problem
Current LED technologies face challenges in enhancing luminous efficiency, particularly in increasing internal quantum efficiency and light extraction efficiency to reduce energy consumption and carbon emissions.
Innovation Solution
The development of an optoelectronic device with a specific substrate and contact layer configuration, including a first contact layer and a second contact layer arranged in a two-dimensional array without vertical overlap, to improve current spreading and light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional contact layer configuration is used, then device structure is simple, but current spreading is insufficient and light extraction efficiency is low
Solution Approach 1:
The contact layer is divided into multiple discrete contact regions arranged in a two-dimensional array pattern rather than a continuous layer. This segmentation allows current to spread more effectively through the semiconductor layers while creating optical pathways for improved light extraction efficiency.
Solution Approach 2:
The contact regions are arranged in a two-dimensional array pattern, transitioning from conventional one-dimensional or point contacts to a distributed two-dimensional configuration. This dimensional change enhances both current spreading capability and light extraction efficiency by providing multiple pathways in both lateral directions.
2Productivity
If second contact layer overlaps with first contact layer, then manufacturing process is simpler, but light extraction efficiency is reduced due to light absorption by LED structure
Solution Approach 1:
The second contact layer is extracted or removed from positions where it would overlap with the first contact layer in the vertical direction. This creates gaps or voids that allow light to escape without being absorbed by the contact layers, directly improving light extraction efficiency while maintaining electrical functionality through the distributed contact region array.
3Productivity
If contact regions are too far apart, then manufacturing precision requirements are reduced, but current spreading efficiency decreases
Solution Approach 1:
The spacing between adjacent contact regions is optimized to a specific range (0.8% to 8% of the first length of the substrate). This parameter optimization ensures that contact regions are close enough to enable effective current spreading through the semiconductor layers, while maintaining relaxed manufacturing precision requirements compared to tighter spacing configurations.
Data Source
AI summary
The present disclosure provides an optoelectronic device comprising a semiconductor stack comprising a first side having a first length; a first contact layer on the semiconductor stack; and a second contact layer on the semiconductor stack opposite to the first contact layer, wherein the second contact layer is not overlapped with the first contact layer in a vertical direction; and wherein the second contact layer comprises multiple contact regions separated from each other and arranged in a two-dimensional array, wherein a first distance between the two adjacent contact regions is between 0.8% and 8% of the first length.