Non-Thermal IR Preheating for Low-Temperature CVD Precursor Stability
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Solution Overview
Problem
Current semiconductor fabrication processes face challenges in maintaining precursor gas temperature stability during preheating for epitaxial deposition, leading to inefficiencies in dissociation and heat loss prior to delivery to the processing region.
Innovation Solution
A deposition apparatus and method that utilizes a gas distribution assembly with non-thermal energy sources, such as IR lamps, to preheat precursor gases at the point of introduction, maintaining heat along the flow path to the processing region, thereby minimizing temperature delta and heat loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional resistive or convective heating elements are used to preheat precursor gases, then the gases can be heated to required temperatures, but significant heat loss occurs and temperature stability deteriorates during transport to the processing region
Solution Approach 1:
The patent replaces conventional resistive or convective heating elements with a non-thermal energy source (such as a laser or electromagnetic radiation source) to preheat precursor gases. This substitution eliminates the need for physical contact heating, thereby minimizing heat loss during transport and improving temperature stability at the processing region.
Solution Approach 2:
The patent introduces a non-thermal energy source as an intermediary between the precursor gas and the heating process. This intermediary transfers energy to the gas molecules directly through absorption of electromagnetic radiation, avoiding the thermal conduction losses associated with conventional heating elements and maintaining more stable temperatures during gas flow to the processing region.
2Temperature
If precursor gases are heated using conventional heating elements, then the gases reach required temperatures, but temperature uniformity and stability deteriorate along the flow path
Solution Approach 1:
The patent replaces conventional heating elements with non-thermal energy sources that can provide more uniform energy distribution throughout the gas flow path. This substitution ensures consistent temperature uniformity and stability from the point of introduction through to the processing region, eliminating temperature gradients caused by conventional heating methods.
Solution Approach 2:
The patent changes the heating mechanism from thermal conduction to non-thermal energy absorption, fundamentally altering how temperature is imposed on the precursor gas. This parameter change enables better control over temperature distribution and stability along the entire flow path, as the non-thermal energy source can be positioned and controlled to provide uniform heating without the limitations of conventional heating elements.
3Loss of energy
If non-thermal energy sources are used to preheat precursor gases at the point of introduction, then heat loss is minimized and temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex thermal management systems with non-thermal energy sources, which inherently minimize heat loss by design. While the non-thermal energy source itself adds complexity, it eliminates the need for complex insulation, heat shielding, and temperature control systems that would be required with conventional heating elements, potentially resulting in a simpler overall system architecture.
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 the efficiency of precursor dissociation and deposition processes, reducing film growth rate variations and improving the percentage of germanium in films, while minimizing the need for resistive or convective heating elements and associated safety concerns.
Implementation Method 1
A deposition apparatus and method that utilizes a gas distribution assembly with non-thermal energy sources, such as IR lamps, to preheat precursor gases at the point of introduction
Implementation Method 2
enhances the efficiency of precursor dissociation and deposition processes
Data Source
AI summary
A method and apparatus for delivering precursor materials to a processing chamber is provided. In one embodiment, a deposition apparatus is provided. The apparatus includes a chamber having a longitudinal axis, and a gas distribution assembly coupled to a sidewall of the chamber. The gas distribution assembly comprises a plurality of plenums coupled to one or more gas sources, an energy source positioned to provide energy to each of the plurality of plenums, and a variable power source coupled to the energy source, wherein the gas distribution assembly provides a flow path through the chamber that is normal to the longitudinal axis of the chamber.