LED Semiconductor Layer Structure for Hole Injection and ESD Tolerance
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Solution Overview
Problem
Conventional light-emitting diodes (LEDs) face challenges in enhancing hole injection efficiency and electrical static discharge (ESD) tolerance while maintaining brightness, particularly in semiconductor devices with In-containing layers.
Innovation Solution
The semiconductor device incorporates a first and second In-containing Group III-V semiconductor layer with varying indium content, an electron blocking structure, and specific dopant concentrations to optimize hole injection efficiency and ESD tolerance, with the second In-containing layer enhancing these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If In-containing layers are used to improve hole injection efficiency, then hole injection efficiency is improved, but light absorption increases
Solution Approach 1:
The patent applies local quality by creating spatial variation in indium content across different layers. The first In-containing layer has a first indium content optimized for hole injection, while the second In-containing layer has a second indium content optimized for reduced light absorption. This local differentiation allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
The patent uses composite materials by combining multiple In-containing layers with different indium compositions. The structure includes GaInN layers with varying indium content (e.g., 5-15% in the first layer, 2-8% in the second layer), creating a composite semiconductor structure that simultaneously achieves improved hole injection efficiency and reduced light absorption through the balance of different material properties.
2Reliability
If electron blocking structure is added to improve ESD tolerance, then ESD tolerance is improved, but device complexity increases
Solution Approach 1:
The patent merges the electron blocking function with the existing In-containing layers by optimizing their composition and positioning. The In-containing layers are designed to serve dual purposes: improving hole injection efficiency and providing electron blocking capability. This integration reduces device complexity by eliminating the need for separate electron blocking structures while maintaining ESD tolerance.
Solution Approach 2:
The In-containing layers are designed with multi-functionality, serving as both hole injection enhancement layers and electron blocking structures. By adjusting the indium content and layer thickness, the same structural elements perform multiple functions, thereby improving ESD tolerance without proportionally increasing device complexity.
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 configuration improves hole injection efficiency and ESD tolerance, leading to enhanced brightness and reduced light absorption, resulting in a more efficient and reliable semiconductor device.
Implementation Method 1
The first Group III-V semiconductor layer has a first indium content, the second Group III-V semiconductor layer has a second indium content, and the second indium content is less than the first indium content
Implementation Method 2
an electron blocking structure between the active region and the second semiconductor layer
Implementation Method 3
Light-emitting diodes (LEDs) are widely used as solid-state light sources
Data Source
AI summary
A semiconductor device is provided. The semiconductor device includes a first semiconductor layer; a second semiconductor layer on the first semiconductor layer; an active region between the second semiconductor layer and the first semiconductor layer; an electron blocking structure between the active region and the second semiconductor layer; a first nitride semiconductor layer between the active region and the electron blocking structure, and including indium and aluminum elements; and a second nitride semiconductor layer between the electron blocking structure and the second semiconductor layer, including indium element and devoid of gallium element; wherein the first nitride semiconductor layer has a first indium content, the second nitride semiconductor layer has a second indium content, and the first indium content is greater than the second indium content.