In Situ Steam Generation Lamphead Cooling Control
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Solution Overview
Problem
In the fabrication of integrated circuits, existing in-situ steam generation (ISSG) oxidation processes face challenges in maintaining stable temperature and pressure conditions, leading to non-uniform oxide film thickness due to temperature fluctuations in the reactor chamber.
Innovation Solution
The implementation of a control system that stabilizes the flow rate of cooling gas through a lamphead, using a mass flow controller and pressure controller to maintain constant temperature and pressure, ensuring uniform oxide film deposition by adjusting the flow rate and exhaust rate of the cooling gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If in-situ steam generation oxidation is performed without flow rate control, then the deposition process can proceed, but temperature fluctuations occur leading to non-uniform oxide film thickness
Solution Approach 1:
The patent implements a feedback control system where a flow controller continuously monitors and adjusts the cooling gas flow rate through the lamphead to maintain stable lamp temperature. This closed-loop control prevents temperature fluctuations that would otherwise cause non-uniform oxide film deposition, directly resolving the contradiction between deposition capability and temperature stability.
Solution Approach 2:
The patent changes the operational parameters of the lamphead by introducing controlled cooling gas flow rates. By adjusting this parameter, the lamp temperature is stabilized, which in turn stabilizes the reactor chamber temperature during ISSG oxidation, ensuring uniform oxide film thickness while maintaining the deposition process.
2Temperature
If cooling gas flow rate is increased to stabilize lamp temperature, then temperature stability improves, but system complexity increases due to additional control components
Solution Approach 1:
The patent employs a feedback control mechanism where the flow controller automatically adjusts cooling gas flow based on temperature measurements. This self-regulating system stabilizes lamp temperature without requiring complex manual intervention or multiple control components, achieving temperature stability with minimal added complexity.
Solution Approach 2:
The control system is designed to automatically monitor and adjust its own operating parameters. The flow controller self-regulates the cooling gas flow rate based on feedback from temperature sensors, eliminating the need for external complex control systems and reducing overall device complexity while maintaining temperature stability.
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 results in a stable thermal environment, reducing temperature fluctuations and achieving uniform oxide film thickness, enhancing the consistency and quality of the oxide layers deposited during ISSG oxidation processing.
Implementation Method 1
a lamphead over the radiant source for cooling the radiant source
Implementation Method 2
in situ steam generation (ISSG) oxidation
Data Source
AI summary
An apparatus for in situ steam generation oxidation are provided. The apparatus includes a reactor chamber. The apparatus also includes a radiant source over the chamber. The radiant source includes a plurality of lamps for heating the reactor chamber. The apparatus further includes a lamphead over the radiant source for adjusting the temperature of the radiant source. In addition, the apparatus includes a gas inlet system coupled to the lamphead. The gas inlet system includes a mass flow controller for adjusting the flow rate of cooling gas into the lamphead. The apparatus includes a gas outlet system, on the opposite side of the cooling gas inlet system, coupled to the lamphead. The gas outlet system includes a pressure controller for accelerating the exhaust rate of the cooling gas.