Multi-Quantum-Well Structure for LED Hole Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multi-quantum-well structures in semiconductor chips face challenges in efficiently injecting holes into quantum-well layers further away from the p-type side, leading to reduced efficiency and quality due to homogeneous thickness and high indium content, which results in losses from non-radiative Auger recombination and charge carrier overflow.
Innovation Solution
The semiconductor chip employs a multi-quantum-well structure with alternating emission and transport regions, where thicker barrier layers and lower indium content quantum-well layers in emission regions, combined with thinner layers and higher indium content in transport regions, enhance hole injection and charge carrier distribution, improving luminous efficiency by modulating layer thickness and composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If homogeneous thickness and high indium content are used in multi-quantum-well structures, then the quantum-well layers can be grown continuously, but hole injection efficiency decreases and non-radiative Auger recombination losses increase
Solution Approach 1:
The patent applies local quality by creating distinct regions within the multi-quantum-well structure: emission regions with thicker barrier layers and lower indium content for efficient hole injection and radiative recombination, and transport regions with thinner layers and higher indium content for improved hole transport. This spatial variation in material composition resolves the contradiction by optimizing different locations for different functions.
Solution Approach 2:
The multi-quantum-well structure is segmented into alternating emission regions and transport regions along the growth direction. This segmentation allows the structure to simultaneously achieve continuous growth while creating localized zones with optimized properties for hole injection and radiative recombination, preventing Auger recombination losses.
2Reliability
If thicker barrier layers are used in emission regions, then hole injection efficiency improves, but the overall device complexity increases
Solution Approach 1:
Thicker barrier layers are selectively implemented only in emission regions where hole injection is critical, while transport regions maintain thinner layers. This localized approach improves hole injection efficiency without uniformly increasing complexity throughout the entire structure.
Solution Approach 2:
The patent merges multiple functions into the alternating emission and transport regions: emission regions handle both hole injection and radiative recombination, while transport regions facilitate hole transport. This functional integration achieves high reliability without proportionally increasing device complexity.
3Reliability
If lower indium content is used in quantum-well layers, then material quality improves, but light generation efficiency decreases
Solution Approach 1:
Different indium content levels are assigned to different regions: lower indium content in emission regions for high material quality and efficient hole injection, and higher indium content in transport regions for improved hole transport. This resolves the contradiction by matching material composition to functional requirements in each region.
Solution Approach 2:
The multi-quantum-well structure functions as a composite material system with spatially varying composition. By combining regions of different indium content and barrier thickness, the structure achieves both high material quality in emission zones and efficient hole transport in transport zones, resolving the trade-off between quality and energy efficiency.
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 configuration effectively increases luminous efficiency by ensuring efficient hole transport and recombination in emission regions, reducing losses and maintaining high-quality quantum-well layers, thereby enhancing the performance of light-emitting diode chips.
Implementation Method 1
the active zone is intended to generate electromagnetic radiation, in particular near-ultraviolet radiation, visible light or near-infrared radiation
Data Source
AI summary
An optoelectronic semiconductor chip is disclosed. In an embodiment a chip includes an active zone with a multi-quantum-well structure, wherein the multi-quantum-well structure includes multiple quantum-well layers and multiple barrier layers, which are arranged sequentially in an alternating manner along a growth direction and which each extend continuously over the entire multi-quantum-well structure, wherein seen in a cross-section parallel to the growth direction, the multi-quantum-well structure has at least one emission region and multiple transport regions, wherein the quantum-well layers and the barrier layers are thinner in the transport regions than in the emission region, wherein, along the growth direction, the transport regions have a constant width, and wherein the quantum-well layers and the barrier layers are oriented parallel to one another in the emission region and in the transport regions.