Off-Axis MBE Source Layout for Uniform Oxide Semiconductor Growth
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Solution Overview
Problem
Conventional molecular beam epitaxy (MBE) systems face challenges in achieving high film quality and throughput due to limitations in growth rate, uniformity, and scalability to larger substrate sizes.
Innovation Solution
The configuration of a material deposition system with an off-axis material source in a high-vacuum reaction chamber, where the material source is positioned at a tilt angle, orthogonal distance, and lateral distance relative to the substrate, optimized to achieve desired layer deposition uniformity and growth rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional MBE uses slow deposition rates to achieve uniform atomic monolayer-scale coverages, then film uniformity and quality are improved, but productivity and throughput deteriorate
Solution Approach 1:
The patent implements dynamic control of the substrate rotation speed during deposition. By varying the rotation speed, the system optimizes the distribution of material flux across the substrate surface, achieving uniform film deposition at higher growth rates than conventional static MBE processes
Solution Approach 2:
The patent introduces substrate rotation as an additional degree of freedom to control film uniformity. Instead of relying solely on slow deposition rates, the system uses rotational motion in the temporal dimension to achieve spatial uniformity across the substrate, enabling faster deposition while maintaining precision
2Manufacturing precision
If conventional MBE uses slow deposition rates to achieve precise thickness control, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The patent implements real-time monitoring and feedback control of the deposition process. By measuring film thickness during deposition and adjusting deposition parameters accordingly, the system maintains precise thickness control at higher deposition rates, eliminating the need for slow growth rates
Solution Approach 2:
The system dynamically adjusts deposition parameters including substrate rotation speed and material flux during the deposition process. This dynamic control enables precise thickness management while operating at higher productivity levels than conventional static MBE
3Manufacturing precision
If conventional MBE uses high vacuum conditions to achieve low impurity levels, then film purity is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The patent modifies the vacuum pressure parameter during different stages of the deposition process. By using higher vacuum levels during critical deposition phases and relaxed vacuum during other phases, the system achieves low impurity levels without requiring continuously extreme vacuum conditions, reducing system complexity
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 enables high-quality, uniform semiconductor layers to be deposited at higher growth rates, improving throughput and scalability while maintaining low impurity levels and precise thickness control.
Implementation Method 1
thin film materials are deposited on a planar deposition surface using, for example, a source material in a reaction chamber. Molecular beam epitaxy (MBE) is one of several methods of depositing single crystal thin films in a reaction chamber
Implementation Method 2
heating the substrate
Data Source
AI summary
Methods of forming oxide-based semiconductor layers include rotating a substrate around a center axis of a substrate deposition plane; heating the substrate; and emitting materials from a plurality of material sources to form an oxide-based layer on the substrate. The material sources comprise a source of oxygen species and at least other two material sources. Each material source has i) an exit aperture with an exit aperture plane and ii) a predetermined material ejection spatial distribution from the exit aperture plane, the material ejection spatial distribution having a symmetry axis which intersects the substrate at a point offset from the center axis. The exit aperture is positioned to achieve a desired layer deposition uniformity for a desired layer growth rate of the oxide-based layer.