LED Quantum Well Growth Pressure Differentiation
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Solution Overview
Problem
The conventional growth of quantum well and quantum barrier layers in semiconductor chips under the same pressure leads to poor interface crystal quality, affecting luminous efficiency and optical performance due to differences in material composition and growth conditions.
Innovation Solution
The growth pressures of the quantum well and quantum barrier layers are differentiated, with the quantum barrier grown at a lower pressure than the quantum well, enhancing atomic mobility and promoting two-dimensional growth to improve interface crystal quality and luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the quantum well and quantum barrier are grown under the same pressure, then the manufacturing process is simple, but the interface crystal quality is poor
Solution Approach 1:
The patent applies local quality by differentiating growth parameters for different regions of the quantum well layer. Specifically, the quantum well region is grown at a first growth pressure while the quantum barrier region is grown at a second growth pressure that is lower than the first. This localized parameter differentiation optimizes the crystal quality at each interface independently, resolving the contradiction between manufacturing simplicity and interface crystal quality.
Solution Approach 2:
The patent implements parameter changes by varying the growth pressure during the formation of different portions of the quantum well layer. The growth pressure is adjusted from a first pressure for the quantum well to a second lower pressure for the quantum barrier. This dynamic parameter adjustment enables precise control over interface crystal quality without fundamentally changing the manufacturing process complexity.
2Quantity of substance
If the growth pressure of the quantum well is too low, then the incorporation efficiency of In element increases, but the wavelength continuity and homogeneity are destroyed
Solution Approach 1:
The patent applies local quality by assigning different growth pressures to different regions: a lower growth pressure for the quantum barrier to enhance In element incorporation, and a higher growth pressure for the quantum well to maintain wavelength continuity and homogeneity. This spatial differentiation of growth conditions allows each region to optimize its specific requirements without compromising the other.
3Speed
If the growth pressure of the quantum well is too high, then the atomic mobility is affected, but the quantum well grows in three dimensions causing surface roughening
Solution Approach 1:
The patent applies local quality by using different growth pressures for different regions. The quantum barrier is grown at a lower pressure to maintain atomic mobility and promote two-dimensional growth, while the quantum well is grown at a higher pressure to control surface morphology and prevent three-dimensional growth. This resolves the contradiction between atomic mobility and surface smoothness through localized parameter optimization.
4Adaptability or versatility
If the quantum well and quantum barrier have different material compositions, then the device performance can be optimized, but the interface crystal quality deteriorates due to different growth conditions
Solution Approach 1:
The patent resolves this contradiction by applying local quality through differentiated growth pressures. The quantum well with its specific material composition is grown at a first growth pressure optimized for its properties, while the quantum barrier with different material composition is grown at a second lower growth pressure. This allows each material layer to be optimized independently while maintaining excellent interface crystal quality.
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 enhances the interface crystal quality between the quantum well and quantum barrier, leading to improved luminous efficiency and uniform current distribution across the semiconductor chip, thereby increasing its performance and lifespan.
Implementation Method 1
a quantum well layer, wherein the quantum well layer is stacked on the N-type gallium nitride layer, wherein the quantum well layer comprises one or more quantum barriers and one or more quantum wells stacked successively in sequence
Data Source
AI summary
A semiconductor chip of a light emitting diode includes a substrate, and an N-type gallium nitride layer, a quantum well layer, and a P-type gallium nitride layer stacked on the substrate successively, an N-type electrode electrically connected to the N-type gallium nitride layer, and a P-type electrode electrically connected to the P-type gallium nitride layer. The quantum well layer includes at least one quantum barrier and at least one quantum well stacked successively in sequence, wherein the growth pressure of the quantum barrier and the growth pressure of the quantum well are different, such that the interface crystal quality between the quantum well and the quantum barrier of the quantum well layer can be greatly improved to enhance the luminous efficiency of the semiconductor chip.