Shared-Volume Gas Pressure Control for Precise Multi-Chamber Dosing
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Solution Overview
Problem
Existing gas delivery systems in semiconductor manufacturing are inefficient in delivering precursor gases to multiple processing chambers, leading to waste and high hardware costs due to inaccurate and non-reproducible delivery methods.
Innovation Solution
A gas distribution apparatus with a shared volume, pressure gauge, pressure controller, and flow controllers that utilize a first pressurizing sequence to establish a predetermined pressure and a second pressurizing sequence to minimize upstream valve cycling, ensuring precise and repeatable precursor delivery to multiple processing stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multi-station gas delivery system is used to improve throughput, then productivity increases, but manufacturing precision deteriorates due to inaccurate precursor delivery
Solution Approach 1:
The system divides the gas delivery into separate phases: a pressurization phase where the reservoir is filled to a predetermined pressure, and a delivery phase where predetermined amounts are dispensed to each station. This segmentation allows the reservoir to be pressurized once to serve multiple stations accurately, resolving the contradiction between throughput and precision.
Solution Approach 2:
The reservoir is pressurized to a predetermined value before gas delivery to multiple stations begins. This preliminary pressurization action ensures that when gas is delivered to each station, the pressure is already optimized for precise delivery, eliminating the need for real-time pressure adjustment during high-speed multi-station processing.
2Device complexity
If traditional gas delivery methods are used, then system complexity is reduced, but loss of substance increases due to precursor waste
Solution Approach 1:
The system incorporates a pressure sensor that monitors reservoir pressure and provides feedback to the controller. The controller uses this feedback to determine when the reservoir needs pressurization and controls the valve actuator accordingly. This feedback mechanism ensures precise delivery of predetermined amounts to each station, preventing precursor waste while maintaining manageable system complexity.
Solution Approach 2:
The system changes the pressure parameter of the reservoir from ambient to a predetermined elevated pressure, and then controls the delivery to maintain precise dosage. By controlling the pressure parameter and the timing of valve operations, the system delivers exact amounts to each station, minimizing precursor waste without requiring complex individual control for each station.
3Ease of operation
If pressure control is not optimized, then ease of operation is maintained, but loss of energy increases due to excessive valve cycling
Solution Approach 1:
The reservoir maintains a sustained pressurized state during the multi-station processing cycle, eliminating the need for repeated pressurization and valve cycling. This continuous pressurization allows gas to be delivered to multiple stations sequentially without energy-intensive re-pressurization, reducing energy loss while keeping the system easy to operate through automated control.
Data Source
AI summary
Gas distribution apparatus to provide uniform flows of gases from a single source to multiple processing chambers are described. A valve upstream of a shared volume is controlled by at least two pressurizing sequences during a process it the processing chamber. The first pressurizing sequence opens and closes the upstream valve a first number of cycles and the second pressurizing sequence opens and closes the upstream valve less frequently after the first number of cycles. The open/close timing of the second pressurizing sequence occurs less frequently than the open/close timing of the first pressurizing sequence.