Semiconductor Stack with Variable Quantum Wells for Narrower LED Emission
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Solution Overview
Problem
Current semiconductor stacks with uniform well thicknesses in light-emitting diodes (LEDs) face inefficiencies in light-emitting intensity and spectral purity due to uneven carrier injection and lattice mismatch-induced polarization effects, leading to reduced light-emitting efficiency and broader emission spectra.
Innovation Solution
A semiconductor stack design featuring alternating first and second well sets with different thicknesses and materials, including AlxInyGa1−x−yN, where the second wells are thicker and more numerous than the first wells, and a stress-releasing region to mitigate lattice mismatch, enhancing carrier recombination and spectral narrowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform well thicknesses are used in semiconductor stacks, then manufacturing simplicity is maintained, but light-emitting intensity and spectral purity are reduced due to uneven carrier injection and polarization effects
Solution Approach 1:
The active structure is segmented into multiple well sets (first well set and second well set) with different thicknesses, where each well set contains wells of uniform thickness but different from adjacent sets. This segmentation allows optimization of carrier injection and recombination in different regions, improving light-emitting intensity and spectral purity while managing polarization effects through structured variation.
Solution Approach 2:
Different well thicknesses are assigned to different spatial locations within the active structure. The first wells have a first thickness and the second wells have a second thickness different from the first, creating local variations that optimize carrier confinement and recombination efficiency in specific regions, thereby enhancing overall light-emitting performance.
2Productivity
If alternating well sets with different thicknesses are implemented, then carrier recombination is optimized and polarization effects are reduced, but manufacturing complexity increases
Solution Approach 1:
The active structure employs periodic alternation between first well sets and second well sets with different thicknesses. This periodic structure creates a regular pattern of carrier confinement and release zones, optimizing recombination efficiency and reducing polarization effects through systematic variation rather than random complexity.
Solution Approach 2:
The semiconductor stack utilizes composite material composition with AlxInyGa1-x-yN in the wells and AlGa1-yN barriers, combining materials with different properties to achieve optimal carrier confinement, recombination efficiency, and polarization management. The composite structure allows tuning of electronic and optical properties through material composition ratios.
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 design improves light-emitting intensity and efficiency by optimizing carrier recombination and reducing polarization effects, resulting in a narrower emission spectrum and higher light purity.
Implementation Method 1
The active structure includes a first well set and a second well set arranged alternately, wherein each first well has a first thickness and each second well has a second thickness different from the first thickness
Implementation Method 2
lattice mismatch-induced polarization effects
Implementation Method 3
a stress-releasing region to mitigate lattice mismatch
Data Source
AI summary
A semiconductor stack includes a first semiconductor structure, a second semiconductor structure and an active structure. The active structure includes a first well set, a second well set and a plurality of barriers. The first well set is disposed on the first semiconductor structure and includes one or multiple first wells. The second well set is disposed between the first well set and the second semiconductor structure and includes one or multiple second wells. The plurality of barriers is arranged alternately with the one or multiple first wells and the one or multiple second wells. The first well has a first thickness. The second well has a second thickness different from the first thickness. The one or multiple first wells and the one or multiple second wells include AlxInyGa1−x−yN respectively, wherein 0≤x≤1, 0≤y≤1, 0≤1−x−y<1.