Multi-Chamber Vacuum Platform for Contamination-Free Gate Stack Fabrication
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Solution Overview
Problem
Current semiconductor fabrication processes expose wafers to ambient air and contaminants during the formation of gate stacks, which can lead to contamination and reduced throughput due to the need for multiple processing chambers and lengthy pump-down times.
Innovation Solution
A multi-chamber platform with advanced vacuum isolation and processing chambers, including turbomolecular and cryogenic pumps, allows for the deposition and treatment of insulative and conductive layers without exposing wafers to ambient air, enabling efficient and contamination-free fabrication of gate stacks with enhanced throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wafers are transferred between multiple processing chambers using conventional vacuum systems, then processing can be completed, but pump-down times increase and throughput decreases
Solution Approach 1:
The system divides the vacuum environment into multiple isolated chambers (deposition chamber, treatment chamber, transfer chamber) that can be independently pumped and maintained at different vacuum levels. This allows simultaneous processing in one chamber while another chamber is being pumped down, eliminating the need to wait for complete system pump-down before transferring wafers between chambers.
Solution Approach 2:
The transfer chamber is pre-pumped to vacuum before wafer transfer operations. This preliminary action ensures that the transfer path is already at the required vacuum level, eliminating delays during actual wafer transfer. The system prepares the vacuum environment in advance rather than pumping down during the transfer process.
2Reliability
If wafers are exposed to ambient air during processing, then simpler equipment can be used, but contamination increases and film properties deteriorate
Solution Approach 1:
The system maintains a vacuum environment (inert atmosphere) throughout all processing steps including deposition, treatment, and transfer operations. This prevents oxidation and contamination of the insulative film and gate electrode materials by ambient air, ensuring high film quality and reliable device performance without requiring additional protective atmosphere systems.
Solution Approach 2:
The transfer chamber acts as an intermediary vacuum environment that connects the deposition chamber and treatment chamber. It provides a controlled vacuum interface that allows wafer transfer without exposure to ambient air, maintaining the inert environment throughout the entire processing sequence.
3Adaptability or versatility
If multiple separate processing chambers are used for deposition and treatment, then process flexibility is maintained, but system complexity and processing time increase
Solution Approach 1:
The system merges the deposition chamber, treatment chamber, and transfer chamber into a single integrated vacuum platform. This consolidation maintains process flexibility through independent chamber control while reducing overall system complexity compared to completely separate systems. The shared vacuum infrastructure and coordinated chamber operations eliminate redundant components.
Solution Approach 2:
Each chamber is designed with multi-functionality to handle various processing operations. The deposition chamber can perform both deposition and serve as a transfer interface, while the treatment chamber can handle multiple types of plasma treatments. This universality reduces the total number of specialized chambers needed while maintaining full process capability.
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 solution minimizes exposure to contaminants, reduces pump-down times, and increases throughput by maintaining high vacuum levels in processing chambers, resulting in improved film properties and increased processing efficiency.
Implementation Method 1
A multi-chamber platform with advanced vacuum isolation and processing chambers, including turbomolecular and cryogenic pumps
Implementation Method 2
PVD chambers which sputter a target to dislodge material from the target and deposit it on the wafer
Implementation Method 3
the decoupled plasma nitridation (DPN) chamber which utilizes a plasma for the nitridation process
Data Source
AI summary
A system, method and apparatus is capable of producing layers of various materials stacked on one another on a substrate without exposing the substrate to the pressure and contaminants of ambient air until the stack is complete. In one aspect, the stack of layers can include both an insulative layer of one or more insulative films, and a conductive metal layer of one or more conductive metal layer films. In another aspect, a bias signal of positive and negative voltage pulses may be applied to a target of a deposition chamber to facilitate deposition of the target material in a suitable fashion. In yet another aspect, one or more of the deposition chambers may have associated therewith a pump which combines a turbomolecular pump and a cryogenic pump to generate an ultra high vacuum in that chamber. Other features are described and claimed.