Scandium Nitride Insertion Layers for Long-Wavelength InGaN Quantum Wells
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Solution Overview
Problem
Achieving high In content in InGaN quantum well layers is challenging due to the difference in optimal growth temperatures of InGaN and GaN materials, leading to decreased crystal quality and luminous efficiency in GaN-based LEDs, resulting in shorter light-emitting wavelengths.
Innovation Solution
A semiconductor structure with a multiple quantum well layer and an insertion layer made of nitride materials containing a scandium component, which alleviates tensile stress and introduces compressive stress to the InGaN quantum well layer, improving material quality and preventing In precipitation, thereby extending the light-emitting wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high In content is attempted in InGaN quantum well layers, then light-emitting wavelength is extended, but crystal quality deteriorates due to tensile stress
Solution Approach 1:
A Scandium-doped GaN insertion layer is introduced between the GaN barrier layer and InGaN quantum well layer. This insertion layer acts as a stress mediator that introduces compressive stress to counterbalance the tensile stress inherent in high-In-content InGaN quantum well layers, thereby enabling high crystal quality while achieving long wavelength light emission.
2Temperature
If high In content is attempted in InGaN quantum well layers, then light-emitting wavelength is extended, but In precipitation occurs reducing luminous efficiency
Solution Approach 1:
The Scandium-doped GaN insertion layer is grown before the InGaN quantum well layer to preemptively introduce compressive stress that prevents In precipitation during subsequent growth. This preliminary counter-action stabilizes the crystal structure and prevents defects that would otherwise reduce luminous efficiency.
3Manufacturing precision
If GaN quantum barrier layer is grown at high temperature, then crystal quality of GaN is improved, but InGaN quantum well layer decomposes
Solution Approach 1:
The Scandium-doped GaN insertion layer is grown in advance before the InGaN quantum well layer. This preliminary layer establishes a stable foundation with appropriate stress state, enabling the InGaN quantum well layer to maintain its composition stability during high-temperature growth of subsequent GaN barrier layers.
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 semiconductor structure enhances the crystal quality and internal quantum efficiency of LEDs by reducing defect density and maintaining a higher In content in the InGaN quantum well layer, achieving longer light-emitting wavelengths.
Implementation Method 1
the insertion layer made of nitride materials containing a scandium component, which alleviates tensile stress and introduces compressive stress to the InGaN quantum well layer
Data Source
AI summary
A semiconductor structure includes: a first semiconductor layer, a multiple quantum well layers formed on the first semiconductor layer, where the multiple quantum well layer includes a plurality of quantum barrier layers and a plurality of quantum well layers alternately arranged; an insertion layer formed on each of the plurality of quantum well layers; and a second semiconductor layer formed on the multiple quantum well layer; where a material of the insertion layer is a nitride containing a scandium component. In this application, the insertion layer, made of the nitride containing the scandium component, may repair deterioration problem of epitaxial quantum well materials. Moreover, a compressive stress on the quantum well layer located below is introduced, to achieve longer light-emitting wavelengths by using InGaN quantum well materials with a lower content of In component.