Superlattice Semiconductor Fabrication via Rotating Susceptor Gas Segmentation
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Solution Overview
Problem
Conventional methods for fabricating superlattice semiconductor structures using chemical vapor deposition face challenges in achieving uniformity and reproducibility due to inefficient source gas management, leading to deteriorated interfacial properties and prolonged process times.
Innovation Solution
A method involving simultaneous supply of first and second source gases to separate areas on a susceptor within a process chamber, with the susceptor rotating to alternately form different semiconductor layers, eliminating the need for switching valves and reducing process time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional MOCVD process with switching valves is used to form superlattice structure, then different source gases can be supplied alternately, but source gas waste increases and process time prolongs
Solution Approach 1:
The process chamber is divided into multiple independent gas supply zones, each with its own source gas supply system. This allows different source gases to be supplied to different spatial regions simultaneously, eliminating the need for time-based switching and enabling parallel deposition of different semiconductor layers.
Solution Approach 2:
The susceptor rotates periodically to bring different substrate areas through different gas supply zones, creating temporal alternation of source gases at each substrate location. This periodic motion converts spatial gas distribution into temporal gas supply sequence, achieving superlattice formation without switching valves.
2Manufacturing precision
If switching valves are used to alternate source gas supply, then different semiconductor layers can be formed, but interfacial properties deteriorate
Solution Approach 1:
The gas supply system is segmented into multiple independent zones with separate source gas supplies, allowing simultaneous presence of different source gases in different spatial regions. This eliminates the switching action that causes interface deterioration while maintaining the ability to form distinct layers through susceptor rotation.
Solution Approach 2:
The rotating susceptor acts as an intermediary that mediates between the spatially distributed gas supply zones and the substrate. By rotating the susceptor, substrates sequentially expose to different gas zones, achieving layer formation without direct switching of gas supplies, thus protecting interface quality.
3Manufacturing precision
If source gases are supplied alternately through switching valves, then superlattice structure can be formed, but source gas waste increases
Solution Approach 1:
The reaction chamber is divided into multiple gas supply segments, each continuously receiving its designated source gas. This spatial segmentation allows all source gases to be continuously utilized in their respective zones without being exhausted through switching operations, eliminating waste while maintaining reproducible superlattice formation through controlled susceptor rotation.
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 enhances interfacial properties and reproducibility, reduces source gas waste, and simplifies the fabrication process, resulting in superior uniformity and stability of the superlattice semiconductor structure.
Implementation Method 1
Method for fabricating superlattice semiconductor structure using chemical vapor deposition
Implementation Method 2
rotating the susceptor to revolve the substrate through the first and second source gas areas
Data Source
AI summary
The invention provides a method for fabricating a superlattice semiconductor structure capable of achieving excellent interfacial properties and uniformity. For the superlattice semiconductor structure according to the invention, a substrate is mounted on a susceptor within a process chamber. First and second source gases are supplied simultaneously to two different areas on the susceptor within the chamber to form first and second source gas areas separate from each other. The susceptor is rotated to revolve the substrate through the first and second source gas areas.