LED Epitaxial Quantum Well Roughness for High-Indium Emission
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Solution Overview
Problem
The challenge in semiconductor technology is achieving high light-emission efficiency in light-emitting diodes (LEDs) due to the low quality of active regions with high indium (In) component, which affects the performance of GaN-based LEDs.
Innovation Solution
An epitaxial structure for light-emitting devices is developed, featuring a stacked configuration of barrier and quantum well layers with controlled surface roughness, where the quantum well layer has a higher roughness than the barrier layer, enhancing the recombination area for electrons and holes, and using etch sources like tert-butyl chloride to increase the In component in the quantum well layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the In component in the active region is increased to improve light-emission efficiency, then the light-emission efficiency is improved, but the quality of the active region is severely lowered
Solution Approach 1:
The patent applies local quality by creating different surface roughness characteristics in different layers of the active region. The quantum well layer is designed with higher surface roughness than the barrier layer, allowing localized optimization of carrier recombination in the quantum well while maintaining structural integrity through the smoother barrier layer. This differential roughness structure enables high In component content in the quantum well for improved light emission without compromising overall active region quality.
2Use of energy by moving object
If the surface roughness of the quantum well layer is increased to enhance recombination area, then the light-emission efficiency is improved, but the manufacturing precision is worsened
Solution Approach 1:
The patent utilizes parameter changes by systematically varying the surface roughness parameter across different layers. Specifically, the quantum well layer is engineered with higher surface roughness compared to the barrier layer. This controlled parameter variation optimizes carrier recombination efficiency in the quantum well while maintaining manufacturability through defined roughness relationships between layers, rather than requiring absolute precision control at a single roughness value.
Data Source
AI summary
An epitaxial structure of a light-emitting device and a manufacturing method thereof are provided. The epitaxial structure of the light-emitting device includes a first semiconductor layer, an active region and a second semiconductor layer sequentially stacked; where the active region includes at least one group of a barrier layer and a quantum well layer which are stacked, a surface of the quantum well layer away from the first semiconductor layer has a first roughness, a surface of the barrier layer away from the first semiconductor layer has a second roughness, and the first roughness is greater than the second roughness.