Gas Flow System With Segmented Pressure Zones
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Solution Overview
Problem
Current gas flow systems in the semiconductor industry are unable to maintain high pressures at the targets while simultaneously achieving low pressures at the substrate, leading to structural damage and inhibited film growth due to high process gas pressures.
Innovation Solution
A gas flow system with a high pressure region near the targets and a low pressure region near the substrate, separated by a gap, allows for controlled gas flow between regions, using a vacuum pump to maintain low pressure and prevent unwanted chemical reactions, while the gas flow region connects both areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If high gas pressures are maintained throughout the processing chamber, then proper gas flow to targets is achieved, but substrate pressure becomes too high causing structural damage and inhibited film growth
Solution Approach 1:
The processing chamber is divided into distinct pressure zones: a high pressure region near the targets for proper sputtering, and a low pressure region near the substrate for protected film deposition. This spatial segmentation allows each region to operate at optimal pressure independently, resolving the contradiction between target gas flow requirements and substrate protection needs.
Solution Approach 2:
Different regions of the processing chamber are assigned different pressure characteristics: the target area maintains high gas pressure for effective sputtering, while the substrate area maintains low pressure to prevent unwanted interactions. This local differentiation of pressure quality enables simultaneous optimization of both sputtering efficiency and film integrity.
2Device complexity
If uniform pressure is maintained in the processing chamber, then system simplicity is preserved, but film stoichiometry and integrity cannot be maintained
Solution Approach 1:
The gas flow system is segmented into separate control zones with independent pressure regulation. This allows the system to achieve the complex pressure gradient needed for precise film control without requiring complete redesign of the entire gas delivery system, balancing added complexity with necessary manufacturing precision.
Solution Approach 2:
A pressure gradient is introduced as an intermediary mechanism between the gas source and substrate. This gradient acts as a mediator that controls gas flow and sputtered particle trajectories, enabling precise control of film deposition while maintaining system functionality.
3Device complexity
If high pressure venting is not provided, then system simplicity is maintained, but structural damage occurs due to stress from high process gas pressure
Solution Approach 1:
The harmful high pressure is extracted and isolated to a specific region near the targets, while the substrate region is protected from excessive pressure through the pressure gradient. This extraction of the problematic condition prevents structural damage while maintaining the necessary high pressure for sputtering.
Solution Approach 2:
The pressure gradient serves as an intermediary that gradually transitions from high pressure near targets to low pressure near substrate. This gradient mediator prevents abrupt pressure changes that would cause structural stress, while still providing effective pressure venting through the gradient structure.
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 configuration enables proper material sputtering onto the substrate while minimizing unwanted interactions, preventing structural damage and ensuring desired film growth by maintaining the necessary pressure gradients within the processing chamber.
Implementation Method 1
maintain high pressures at a portion of a processing chamber, and low pressure at a different portion of the same chamber
Implementation Method 2
gas flow region is fluidly coupled to the one or more gas inlets and the one or more gas outlets
Implementation Method 3
Sputter deposition is a physical vapor deposition (PVD) method of thin film deposition by sputtering. This involves ejecting material from a target onto a substrate
Implementation Method 4
Sputter deposition is a physical vapor deposition (PVD) method of thin film deposition by sputtering
Data Source
AI summary
A gas flow system is provided, including a gas flow source, one or more gas inlets, one or more gas outlets, a gas flow region, a low pressure region, wherein the low pressure region is fluidly coupled to the one or more gas outlets, a high pressure region, and a gap. The one or more gas inlets are fluidly coupleable to the gas flow source. The gas flow region is fluidly coupled to the one or more gas inlets and the one or more gas outlets. The gap fluidly couples the gas flow region to the high pressure region. The high pressure region near the targets allows for process gas interactions with the target to sputter onto the substrate below. The low pressure region near the substrate prevents unwanted chemical interactions between the process gas and the substrate.