CVD Heating Lamp Assembly for Substrate Temperature Uniformity
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Solution Overview
Problem
Current chemical vapor deposition (CVD) systems face challenges in growing epitaxial films and materials on substrates with minimal contamination, high throughput, and reduced production costs.
Innovation Solution
A CVD reactor system utilizing a heating lamp assembly with split and non-split filament lamps to maintain precise temperature control of the substrate susceptor, allowing for independent adjustment of heat distribution and temperature management within the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional CVD heating methods are used, then the substrate can be heated to required temperature, but temperature uniformity across the substrate surface deteriorates
Solution Approach 1:
The heating system is segmented into multiple independent heating zones along the substrate travel path, with each zone controlled by individual heating elements. This allows different regions of the substrate to receive tailored heating, improving overall temperature uniformity across the substrate surface while maintaining the required processing temperature.
Solution Approach 2:
The patent implements local quality control by providing variable heating conditions at different positions along the substrate. The heating intensity can be independently adjusted for each zone, allowing precise temperature control at specific locations to achieve uniform epitaxial film growth across the entire substrate surface.
2Productivity
If traditional CVD reactor designs are used, then the process can be maintained, but production throughput remains limited
Solution Approach 1:
The patent employs a dynamic heating system where heating elements can be independently controlled and adjusted during operation. The heating zones can be activated or deactivated based on real-time temperature feedback and process requirements, enabling flexible adaptation to different production scenarios and improving throughput without requiring complete system redesign.
Solution Approach 2:
The continuous substrate transport system with multiple heating zones maintains continuous processing action. Substrates move continuously through the reactor while receiving heating treatment in sequential zones, eliminating idle time between processing steps and significantly improving production throughput compared to batch processing methods.
3Measurement precision
If conventional heating assemblies are used, then the structure remains simple, but temperature control precision deteriorates
Solution Approach 1:
The heating assembly incorporates feedback control mechanisms where temperature sensors continuously monitor the substrate temperature and feed this information back to the control system. The control system then adjusts the heating element power accordingly to maintain precise temperature control, achieving high measurement precision through closed-loop feedback despite increased assembly 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
The system achieves effective epitaxial layer growth with reduced contamination and increased throughput, enabling efficient production of epitaxial films and materials on substrates such as gallium arsenide for solar cells and semiconductor devices.
Implementation Method 1
exposing a lower surface of a substrate susceptor to energy emitted from a heating lamp assembly, and heating the substrate susceptor to a predetermined temperature
Implementation Method 2
The first and second ends of the split filament lamps may be maintained warmer than the centers of the split filament lamps. Therefore, outer edges of the substrate susceptor may be maintained warmer than a center point of the substrate susceptor
Data Source
AI summary
Embodiments of the invention generally relate to methods for chemical vapor deposition (CVD) processes. In one embodiment, a method for heating a substrate or a substrate susceptor within a vapor deposition reactor system includes exposing a lower surface of a substrate susceptor, such as a wafer carrier, to energy emitted from a heating lamp assembly, and heating the substrate susceptor to a predetermined temperature. The heating lamp assembly generally contains a lamp housing disposed on an upper surface of a support base and contains at least one lamp holder, a plurality of lamps extending from the lamp holder, and a reflector disposed on the upper surface of the support base, next to the lamp holder, and below the lamps. The plurality of lamps may have split filament lamps and/or non-split filament lamps for heating inner and outer portions of the substrate susceptor.