CVD Reactor Epicyclical Gas Flow for Deposition Uniformity
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Solution Overview
Problem
Existing chemical vapor deposition systems face challenges in achieving uniform deposition and epitaxial growth of semiconductor layers due to non-uniform gas circulation and unwanted deposition on injector walls, leading to inefficiencies and contamination.
Innovation Solution
A chemical vapor deposition reactor design that allows independent rotation of substrate holders and gas injection components at selectable angular speeds, enabling epicyclical trajectories for gas flow over the substrate, which improves deposition uniformity and reduces mechanical stress and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a gas distribution injector is used to direct precursor gases towards targeted regions, then reaction efficiency is improved, but non-uniform gas circulation and recirculation patterns cause unwanted deposition on injector walls
Solution Approach 1:
The patent implements independent rotation of the substrate holder and gas injection component at different angular speeds, creating dynamic relative motion between gas flow and substrate. This dynamic configuration prevents stagnant recirculation zones that cause unwanted deposition on injector walls while maintaining uniform precursor gas distribution across the substrate surface.
Solution Approach 2:
The independent rotation of gas injection components creates periodic variation in gas flow patterns over the substrate. By controlling the rotation speed and direction, the system periodically refreshes the gas circulation patterns, preventing the formation of stable recirculation zones that lead to unwanted deposition on injector walls.
2Manufacturing precision
If the substrate holder is rotated to increase deposition uniformity, then manufacturing precision is improved, but mechanical stress and contamination increase
Solution Approach 1:
The patent replaces the traditional mechanical rotation of the entire substrate holder with independent rotation of the gas injection component. This substitution eliminates the mechanical stress and potential contamination associated with rotating the substrate holder while achieving the same deposition uniformity through controlled gas flow dynamics.
Solution Approach 2:
By implementing independent rotation of the gas injection component rather than the substrate holder, the system achieves dynamic control over gas flow patterns without subjecting the substrate mounting mechanism to mechanical stress. This dynamic approach maintains deposition uniformity while improving system reliability.
3Manufacturing precision
If independent rotation of substrate holder and gas injection component is implemented, then deposition uniformity is enhanced, but device complexity increases
Solution Approach 1:
The gas injection component serves multiple functions: it distributes precursor gases uniformly across the substrate and simultaneously rotates independently to control gas flow patterns. This multi-functionality reduces the need for separate mechanical rotation mechanisms for the substrate holder, thereby limiting the increase in device complexity while achieving enhanced deposition uniformity.
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 design enhances deposition uniformity and reliability by minimizing mechanical stress and contamination, while maintaining high operational temperatures and efficiency in semiconductor manufacturing processes.
Implementation Method 1
The rotational speeds can be synchronized to cause each point on a surface of the substrate wafer to travel in an epicyclical trajectory within a flow of gas injected by the gas injection component
Implementation Method 2
In many metal organic chemical vapor deposition (MOCVD) processes, for example, combinations of precursor gases comprised of metal organics and hydrides, such as ammonia or arsine, are introduced into a reaction chamber through the injector
Implementation Method 3
The precursor gases mix in the reaction chamber and react to form a deposit on a wafer held within the chamber
Data Source
AI summary
A solution for manufacturing semiconductors is provided. An embodiment provides a chemical vapor deposition reactor, which includes a chemical vapor deposition chamber. A substrate holder located in the chemical vapor deposition chamber can be rotated about its own axis at a first angular speed, and a gas injection component located in the chemical vapor deposition chamber can be rotated about an axis of the gas injection component at a second angular speed. The angular speeds are independently selectable and can be configured to cause each point on a surface of a substrate wafer to travel in an epicyclical trajectory within a gas flow injected by the gas injection component. An angle between the substrate holder axis and the gas injection component axis and/or a distance between the substrate holder axis and the gas injection component axis can be controlled variables.