Semiconductor Layer Sequence for Wavelength Stability
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Solution Overview
Problem
Semiconductor layer sequences in optoelectronic devices, such as light-emitting diodes, experience significant changes in emission wavelength with temperature fluctuations, leading to undesirable color shifts when multiple diodes of different colors are used together, which is not effectively addressed by existing technologies.
Innovation Solution
A semiconductor layer sequence with strategically arranged quantum wells and barrier layers, having different indium contents and lattice constants, is used to reduce temperature-dependent wavelength changes by optimizing the indium content and lattice mismatch between the quantum wells and barrier layers, thereby stabilizing the emission wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor layer sequences are used, then the device structure is simple, but the emission wavelength changes significantly with temperature
Solution Approach 1:
The semiconductor layer sequence is segmented into multiple quantum wells (at least three) with different indium contents, separated by barrier layers. Each quantum well is designed with specific indium content to emit at different wavelengths, creating a multi-quantum well structure that segments the emission spectrum while maintaining temperature stability through the specific arrangement and composition of these segments.
Solution Approach 2:
Different regions of the semiconductor layer sequence have different local compositions - specifically, the quantum wells have different indium contents (first, second, and third indium contents) while the barrier layers have a fourth indium content. This local variation in composition creates different band structures and emission characteristics in different regions, allowing wavelength stabilization across temperature changes through the combined effect of these locally optimized regions.
2Reliability
If multiple quantum wells with different indium contents are used, then wavelength stability improves, but manufacturing precision requirements increase
Solution Approach 1:
The invention changes the parameter of indium content systematically across different quantum wells and barrier layers. By establishing specific relationships between indium contents (first, second, third, and fourth indium contents) and their corresponding lattice constants, the design provides a parameter-based solution that can be controlled through standard epitaxial growth techniques, making the complex multi-parameter optimization manageable through systematic parameter variation.
Solution Approach 2:
The semiconductor layer sequence uses composite material structures combining multiple III-V compound semiconductor materials with different indium contents (such as AlInGaP, InGaP, AlGaP). These composite materials are arranged in a specific sequence with quantum wells and barrier layers, creating a composite structure that leverages the advantageous properties of each material while achieving overall wavelength stabilization through their combined interaction.
3Stability of the object's composition
If quantum wells with different indium contents are arranged in sequence, then temperature-dependent wavelength shift is reduced, but the device complexity increases
Solution Approach 1:
The quantum well structure is segmented into at least three distinct quantum wells with different indium contents, arranged in a specific sequence separated by barrier layers. This segmentation allows each quantum well to contribute differently to the overall emission spectrum, with the specific arrangement and composition differences creating a cumulative effect that stabilizes the emission wavelength against temperature changes while maintaining a manageable structural 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
This approach significantly reduces the temperature-dependent shift in emission wavelength, maintaining color stability across temperature variations and improving the uniformity of charge carrier distribution, enhancing the performance of optoelectronic devices.
Implementation Method 1
The at least three quantum wells are arranged to generate electromagnetic radiation
Implementation Method 2
A second average lattice constant of the barrier layers is thereby lower than a first average lattice constant of the quantum wells. In other words, bracing is set between the quantum wells and the barrier layers
Data Source
AI summary
In at least one embodiment, the semiconductor layer sequence (1) is provided for an optoelectronic semiconductor chip (10). The semiconductor layer sequence (1) contains at least three quantum wells (2) which are arranged to generate electromagnetic radiation. Furthermore, the semiconductor layer sequence (1) includes a plurality of barrier layers (3), of which at least one barrier layer is arranged between two adjacent quantum wells (2) in each case. The quantum wells (2) have a first average indium content and the barrier layers (3) have a second, smaller, average indium content. A second average lattice constant of the barrier layers (3) is thereby smaller than a first average lattice constant of the quantum wells (2).