Single-Crystal Semiconductor Structure on Amorphous Substrates
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Solution Overview
Problem
The limitations of using single crystal substrates for epitaxy growth of Group III-V compound semiconductor layers include size constraints and high costs, necessitating the exploration of alternative substrates and methods to reduce costs and enhance flexibility in layer size determination.
Innovation Solution
A single crystal semiconductor structure is formed on an amorphous substrate using a strain compensation layer, lattice matching layer, and a single crystal semiconductor layer, with specific thickness and material combinations to mitigate thermal expansion differences and enable stable growth, including a direction control film and buffer layers to maintain crystallinity and reduce strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If single crystal substrates are used for epitaxy growth of Group III-V compound semiconductor layers, then high-quality single crystal layers can be obtained, but the substrate size is limited and the cost is high
Solution Approach 1:
The patent introduces a lattice matching layer as an intermediary between the amorphous substrate and the single crystal semiconductor layer. This lattice matching layer serves as a bridge that enables the formation of high-quality single crystal layers on amorphous substrates, overcoming the limitation of using only traditional single crystal substrates.
Solution Approach 2:
The patent creates a copied single crystal structure by forming a single crystal semiconductor layer on an amorphous substrate through a controlled epitaxy process. Instead of relying on the original single crystal substrate, the single crystal structure is reproduced or copied on the amorphous substrate via the lattice matching layer, enabling larger area production at lower cost.
2Manufacturing precision
If single crystal substrates are used for epitaxy growth, then high-quality single crystal layers can be obtained, but the cost of the process becomes high
Solution Approach 1:
The patent replaces expensive single crystal substrates with cheaper amorphous substrates. The amorphous substrate serves as a disposable or sacrificial base that enables the formation of the single crystal semiconductor layer without requiring the high cost of traditional single crystal substrates, thereby reducing manufacturing costs while maintaining crystal quality.
Solution Approach 2:
The lattice matching layer acts as an intermediary that makes it possible to achieve high-quality single crystal growth on inexpensive amorphous substrates, eliminating the need for expensive single crystal substrates while maintaining the desired crystal quality in the final semiconductor layer.
3Adaptability or versatility
If a single crystal semiconductor layer is formed on an amorphous substrate, then cost and size flexibility are improved, but strain due to thermal expansion difference occurs
Solution Approach 1:
The patent introduces a strain compensation layer with specific thermal expansion properties to counterbalance the strain caused by the thermal expansion difference between the amorphous substrate and the single crystal semiconductor layer. By adjusting the parameters of the strain compensation layer (material composition, thickness), the overall strain in the structure is compensated, maintaining stability.
Solution Approach 2:
The strain compensation layer acts as a counterweight to the strain generated by thermal expansion mismatch. The strain compensation layer is designed to produce an equal and opposite strain that cancels out the harmful strain, thereby stabilizing the single crystal semiconductor layer on the amorphous substrate.
4Manufacturing precision
If the thickness of the direction control film is increased, then crystal orientation control is improved, but strain accumulation increases beyond critical thickness
Solution Approach 1:
The patent optimizes the thickness parameter of the direction control film to be within a specific range (equal to or less than 10 times the critical thickness hc). This parameter optimization ensures that the film is thick enough to provide effective crystal orientation control through its single crystal structure, but thin enough to avoid accumulating strain that would exceed the critical thickness and cause structural instability.
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 allows for the cost-effective and flexible production of high-quality single crystal semiconductor layers on amorphous substrates, reducing deformation and maintaining structural integrity across temperature changes, thereby providing a viable alternative to traditional single crystal substrates.
Implementation Method 1
capable of compensating for a strain due to a difference in a coefficient of thermal expansion between an amorphous substrate and a single crystal semiconductor layer
Implementation Method 2
A single crystal substrate is used for epitaxy growth of a single crystal Group III-V compound semiconductor layer
Data Source
AI summary
A single crystal semiconductor includes a strain compensation layer; an amorphous substrate disposed on the strain compensation layer; a lattice matching layer disposed on the amorphous substrate and including two or more single crystal layers; and a single crystal semiconductor layer disposed on the lattice matching layer, the lattice matching layer including a direction control film disposed on the amorphous substrate and including a single crystal structure, and a buffer layer including a material different from that of the direction control film, the buffer layer being disposed on the direction control film and including a single crystal structure.