Self-Assembled Patterns on Silicon Carbide Substrates
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Solution Overview
Problem
The existing semiconductor manufacturing processes are complex and costly due to the need for additional steps like patterning and regrowth to reduce dislocation defects in semiconductor layers, which also deteriorate the substrate surface quality.
Innovation Solution
A semiconductor device and method that utilize self-assembled patterns or grooves on silicon carbide substrates to form epitaxial layers directly, eliminating the need for buffer layers and associated processes, thereby reducing process costs and improving substrate quality by minimizing dislocation defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a buffer layer is formed to reduce dislocation defects, then the crystalline quality is improved, but the manufacturing process becomes complicated and costs increase
Solution Approach 1:
The substrate surface automatically forms self-assembled patterns (nano-dots or grooves) through controlled etching processes, eliminating the need for external patterning steps. The substrate serves itself to create the necessary structures for dislocation management, reducing process complexity while maintaining crystalline quality improvement
Solution Approach 2:
The invention changes the etching parameters (gas composition, temperature, time) to directly form self-assembled patterns on the substrate surface. By adjusting these parameters, the substrate surface transforms into a configuration that naturally reduces dislocation defects without requiring additional buffer layer formation processes
2Manufacturing precision
If additional patterning and etching processes are used to form buffer layers, then dislocation defects are reduced, but manufacturing costs increase
Solution Approach 1:
The substrate surface automatically forms self-assembled patterns (nano-dots or grooves) through controlled etching processes, eliminating the need for external patterning steps. The substrate serves itself to create the necessary structures for dislocation management, reducing process complexity while maintaining crystalline quality improvement
Solution Approach 2:
The invention changes the etching parameters (gas composition, temperature, time) to directly form self-assembled patterns on the substrate surface. By adjusting these parameters, the substrate surface transforms into a configuration that naturally reduces dislocation defects without requiring additional buffer layer formation processes
3Manufacturing precision
If buffer layers are formed through additional processes, then dislocation defects are reduced, but substrate surface quality deteriorates
Solution Approach 1:
The self-assembled patterns (nano-dots or grooves) are formed on the substrate surface before epitaxial growth begins. This preliminary structuring creates a template that guides dislocation propagation away from the growth region, preventing damage to the substrate surface during subsequent buffer layer formation
Solution Approach 2:
The invention changes the etching parameters (gas composition, temperature, time) to directly form self-assembled patterns on the substrate surface. By adjusting these parameters, the substrate surface transforms into a configuration that naturally reduces dislocation defects without requiring additional buffer layer formation processes
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 reduces process costs and enhances substrate quality by directly forming high-quality epitaxial layers with minimized dislocation defects, specifically reducing basal plane dislocations by up to 50% without the need for additional buffer layers, thus improving the reliability and efficiency of semiconductor devices.
Implementation Method 1
the pattern is a self-assembled pattern
Implementation Method 2
forming an epitaxial layer on the buffer layer
Data Source
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AI summary
A semiconductor device comprises a base substrate, a pattern on the base substrate, a buffer layer on the base substrate, and an epitaxial layer on the buffer. The pattern is a self-assembled pattern. A method for growing a semiconductor crystal comprises cleaning a silicon carbide substrate, forming a self-assembled pattern on the silicon carbide substrate, forming a buffer layer on the silicon carbide substrate, and forming an epitaxial layer on the buffer layer. A semiconductor device comprises a base substrate comprising a pattern groove and an epitaxial layer on the base substrate. A method for growing a semiconductor crystal comprises cleaning a silicon carbide substrate, forming a self-assembled projection on the silicon carbide substrate, forming a pattern groove in the silicon carbide, and forming an epitaxial layer on the silicon carbide.