III-V Quantum Well Layer Structure for Higher Light Emission Output
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Solution Overview
Problem
There is a demand for improving the light emission output of semiconductor light-emitting elements using III-V compound semiconductors, as applications for these elements continue to expand.
Innovation Solution
A semiconductor light-emitting element with a layered structure where the composition wavelength difference and lattice constant difference between stacked III-V compound semiconductor layers are optimized, with specific ranges for these differences to enhance light emission output, and a method for producing such elements involving the repeated formation of layers with varying composition ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the composition ratios of well layers are altered to adjust lattice constant difference and cause quantum well straining, then the light emission output is increased, but the composition wavelength difference between layers increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of InGaAsP layers to achieve a specific lattice constant difference (0.01% to 0.60%) while maintaining composition wavelength difference within 50 nm or less. This involves adjusting the In composition ratio difference (Δa) and P composition ratio difference (Δx) to simultaneously satisfy both the strain condition for high output and the wavelength uniformity requirement.
Solution Approach 2:
The patent implements local quality by creating a quantum well structure with specific local composition variations. The well layers have slightly different composition ratios from the barrier layers, creating localized strain fields that enhance carrier confinement and light emission output, while the overall composition wavelength difference remains controlled within acceptable limits.
2Power
If a layered structure with multiple III-V compound semiconductor layers is formed to improve light emission output, then the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the light-emitting layer into multiple alternating InGaAsP layers with different composition ratios. This creates a superlattice or quantum well structure where each layer segment contributes to carrier confinement and light emission, achieving high output through the collective effect of multiple segmented layers rather than a single homogeneous layer.
Solution Approach 2:
The patent uses composite materials by combining multiple InGaAsP layers with different composition ratios within the same light-emitting layer. This composite structure leverages the complementary properties of layers with different compositions to achieve both high light emission output and controlled wavelength characteristics, resolving the complexity issue through functional integration.
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 optimized composition and lattice constant differences lead to increased light emission output, with the semiconductor light-emitting element demonstrating improved performance compared to conventional designs, particularly in achieving a band structure similar to a double heterostructure, thereby enhancing electron confinement and reducing barrier height.
Implementation Method 1
the composition ratios of the well layers are altered so as to adjust a lattice constant difference and cause quantum well straining, and to thereby enable increased output
Implementation Method 2
achieving a band structure similar to a double heterostructure, thereby enhancing electron confinement and reducing barrier height
Data Source
AI summary
Provided is a semiconductor light-emitting element having improved light emission output. The semiconductor light-emitting element includes a light-emitting layer having a layered structure in which a first III-V compound semiconductor layer and a second III-V compound semiconductor layer having different composition ratios are repeatedly stacked. The first and second III-V compound semiconductor layers each contain three or more types of elements that are selected from Al, Ga, and In and from As, Sb, and P. The composition wavelength difference between the composition wavelength of the first III-V compound semiconductor layer and the composition wavelength of the second III-V compound semiconductor layer is 50 nm or less. The ratio of the lattice constant difference between the lattice constant of the first III-V compound semiconductor layer and the lattice constant of the second III-V compound semiconductor layer is not less than 0.05% and not more than 0.60%.