GaInAs Substrate Composition for Low-Bending AlGaAs Epitaxy
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Solution Overview
Problem
Conventional semiconductor manufacturing methods face challenges in reducing substrate bending and stress in semiconductor structures, particularly when high thickness is required, often necessitating the use of stress-compensating layers that can introduce defects or compromise other properties.
Innovation Solution
The approach involves adjusting the lattice constant of a gallium arsenide substrate by adding indium to create a gallium indium arsenide solid solution, allowing for controlled mechanical stress management in epitaxial layers, thereby eliminating the need for stress-compensating layers and enabling the production of high-thickness aluminum gallium arsenide-based components with reduced bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If stress-compensating layers are incorporated into the epitaxial structure to reduce substrate bending, then substrate bending is reduced, but the device complexity and manufacturing complexity increase due to additional layers
Solution Approach 1:
The invention extracts and removes the stress-compensating layers from the epitaxial structure by instead incorporating stress-inducing elements directly into the active semiconductor layers. This eliminates the need for separate compensation layers while achieving the same bending control effect.
Solution Approach 2:
Instead of adding stress-compensating layers to counteract bending, the invention inverts the approach by deliberately introducing stress elements into the active layers that generate the desired bending effect directly, thereby simplifying the overall structure.
2Shape
If stress-compensating layers are added to reduce substrate bending, then substrate bending is reduced, but the manufacturing precision decreases due to potential defects and property compromises
Solution Approach 1:
The invention removes the problematic stress-compensating layers that could introduce defects, and instead integrates stress control directly into the active semiconductor layers through compositional modification, thereby maintaining manufacturing precision.
Solution Approach 2:
The invention changes the compositional parameters of the active semiconductor layers by incorporating specific stress-inducing elements, which allows for precise control of lattice matching and stress distribution without introducing the defects associated with separate compensation layers.
3Length of stationary object
If high thickness is required for the semiconductor component to achieve desired optical or electrical properties, then the component performance is improved, but substrate bending increases
Solution Approach 1:
The invention modifies the compositional parameters of the semiconductor layers to incorporate stress-inducing elements, which allows for high layer thickness while maintaining lattice matching and controlling bending through compositional design rather than thickness limitation.
Solution Approach 2:
The invention creates a composite semiconductor structure with multiple elements (Ga, In, Al, As, P) in specific combinations within the active layers, where each element contributes specific properties including stress characteristics, enabling thick layers with controlled bending behavior.
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 method enables the production of stable semiconductor components with low bending characteristics, allowing for the creation of high-layer-thickness devices like nanostacks without compromising series resistance or efficiency, and avoids stress-induced crystal defects.
Implementation Method 1
a solid solution, more specifically a GaAs substrate crystal, the lattice constant of has been or may have been adjusted in a controlled manner by addition of indium to aluminum gallium arsenide-based components
Data Source
AI summary
A semiconductor device comprising a substrate and an aluminium gallium arsenide-based semiconductor component, the substrate being monocrystalline, and the substrate having a gallium indium arsenide mixed crystal with the empirical formula GA(1-x)In(x)As, the indium content x being between 0.1 percent and 4 percent.