SiC Epitaxy Reactor Temperature Zoning for Higher Throughput
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Solution Overview
Problem
The manufacturing of silicon carbide semiconductor devices faces challenges such as slower epitaxial growth rates, high operating temperatures, and sensitivity to temperature fluctuations, which reduce throughput and lead to inconsistent layer thicknesses.
Innovation Solution
A reactor system with multiple modules, separate load/lock chambers for heating and cooling, and a temperature control system using pyrometers to manage temperature gradients across the reactor, ensuring consistent temperature control and precursor gas distribution for improved silicon carbide epitaxial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high process temperatures are used for silicon carbide epitaxial growth, then the quality of silicon carbide layers is improved, but the throughput of multi-process systems decreases
Solution Approach 1:
The system is divided into multiple reactor modules (first reactor module, second reactor module, etc.), each capable of independent operation. This segmentation allows different modules to operate at different temperatures or process conditions simultaneously, enabling high-quality silicon carbide growth in dedicated high-temperature modules while other modules handle lower-temperature processes, thereby maintaining overall system throughput.
Solution Approach 2:
The patent implements dynamic temperature control within each reactor module, allowing the temperature to be adjusted and optimized for specific process requirements. The temperature control system can dynamically respond to process conditions, maintaining optimal temperatures for high-quality epitaxial growth while enabling flexible scheduling of different process steps across multiple modules to maximize throughput.
2Manufacturing precision
If high process temperatures are maintained, then silicon carbide epitaxial growth quality is improved, but temperature consistency across wafers becomes difficult to maintain
Solution Approach 1:
The temperature control system is designed to provide local temperature optimization within the reactor chamber. Multiple heating zones or independently controllable heating elements allow different regions of the reactor to be tuned for optimal temperature distribution, ensuring uniform temperature across the wafer surface while maintaining the overall high process temperature required for quality silicon carbide growth.
Solution Approach 2:
The system incorporates temperature monitoring and feedback control mechanisms that continuously measure temperature distribution across the wafer and adjust heating parameters in real-time. This feedback loop detects and corrects temperature non-uniformities, maintaining consistent temperatures across all wafers even at high process temperatures, thereby ensuring uniform epitaxial growth quality.
3Adaptability or versatility
If multiple reactor modules are combined into a multi-process system, then process versatility is improved, but throughput decreases due to high temperature requirements
Solution Approach 1:
The multi-process system is segmented into multiple independent reactor modules, each capable of operating autonomously at its optimal temperature. This allows different modules to perform different process steps (e.g., high-temperature epitaxial growth in one module, lower-temperature deposition or annealing in another) simultaneously without thermal interference, thereby maintaining both process versatility and high throughput.
Solution Approach 2:
Each reactor module is designed with universal capabilities to perform multiple process types (epitaxial growth, deposition, annealing, etc.), allowing a single module to handle various process steps. This multi-functionality, combined with parallel operation of multiple modules, enables the system to achieve high process versatility while maintaining high throughput through efficient utilization of each module's capabilities.
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 throughput of silicon carbide epitaxial growth, reduces thermal stress, and achieves more uniform layer thicknesses by maintaining precise temperature control and optimizing gas flow, thereby improving the efficiency of semiconductor device manufacturing.
Implementation Method 1
two or more pyrometers configured to measure temperatures of the graphite wall
Implementation Method 2
two or more coils configured to inductively heat the susceptor
Implementation Method 3
two or more coils configured to inductively heat the susceptor
Implementation Method 4
a susceptor above and below the graphite walls
Data Source
AI summary
Methods and systems for growing silicon carbide epitaxial layers are described. In one example, a reactor system with multiple reactor modules may include a heating load/lock chamber and a cooling load/lock chamber. In another example, a reactor may be heated by separate sets of coils inductively heating a susceptor, which heats graphite near one or more wafers. Multiple pyrometers may measure the temperature of the graphite walls at different locations. Based on temperature differences and/or temperature gradients, a temperature controller may adjust power provided to one or more sets of coils. In yet another example, separations between a wafer carrier and a wafer may be adjusted.