Cluster Vacuum Processing for Oxidation-Free Metal Layer Formation
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Solution Overview
Problem
The challenge in semiconductor manufacturing is the oxidation of transition metal dichalcogenides during substrate transfer, leading to poor interface quality and electrical performance due to exposure to ambient air, which results in native oxide formation and high contact resistance.
Innovation Solution
A method involving a cluster processing system where a two-dimensional transition metal dichalcogenide layer is formed and thermally treated without breaking vacuum, followed by the deposition of a capping layer, integrating pre-cleaning, deposition, and annealing processes to prevent oxidation and ensure good interface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the substrate is transferred among different vacuum environments to perform different processing steps, then the substrate can undergo multiple processing operations, but the substrate is exposed to ambient environmental conditions during transfer, resulting in oxidation and contaminant accumulation on the metal surface
Solution Approach 1:
The patent combines multiple processing chambers (deposition chamber, annealing chamber, cleaning chamber) into a single cluster processing system that maintains continuous vacuum conditions. The substrate is processed through all chambers without breaking vacuum, eliminating exposure to ambient air and preventing oxidation during transfers.
Solution Approach 2:
The patent maintains a vacuum environment throughout the entire processing sequence, creating an inert atmosphere that prevents oxidation of the metal surface. The continuous vacuum from load lock through all processing chambers ensures the metal remains protected from oxygen and water vapor.
2Productivity
If the substrate resides outside the process chamber during queue time, then processing steps can be sequenced, but the metal surface accumulates native oxides and contaminants
Solution Approach 1:
The patent implements continuous processing where the substrate moves sequentially through deposition, annealing, and cleaning chambers without breaking vacuum. This continuous action eliminates idle queue time in ambient air, maintaining both productivity and interface quality by preventing oxidation during transitions.
3Ease of operation
If transition metal dichalcogenides are exposed to air during transfer, then the substrate can be moved between processing steps, but the transition metal dichalcogenides undergo oxidation leading to poor electrical performance
Solution Approach 1:
The patent merges substrate handling operations within a continuous vacuum environment, allowing easy transfer between chambers without exposing the transition metal dichalcogenides to air. The integrated cluster system maintains vacuum throughout, preserving electrical performance while enabling efficient substrate movement.
4Reliability
If multiple processing chambers are integrated in a cluster system, then substrate transfer without breaking vacuum is enabled, but the system complexity increases
Solution Approach 1:
The patent segments the processing system into distinct functional chambers (deposition, annealing, cleaning) that are independently optimized but integrated through vacuum coupling. This segmentation allows complex functionality to be organized into manageable modules, reducing operational complexity while maintaining reliability.
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 minimizes contamination and oxidation, enhancing the electrical performance of semiconductor devices by maintaining the integrity of the metal containing material and capping layer within a controlled environment, thus improving manufacturing flexibility and device reliability.
Implementation Method 1
thermally treating the two-dimensional transition metal dichalcogenide layer to form a treated metal layer
Implementation Method 2
forming a metal containing material for a device structure with minimum exposure to air during manufacturing for semiconductor devices to prevent excess oxidation
Data Source
AI summary
Methods for forming a transition metal material on a substrate and thermal processing such metal containing material in a cluster processing system are provided. In one embodiment, a method for a device structure for semiconductor devices includes forming a two-dimensional transition metal dichalcogenide layer on a substrate in a first processing chamber disposed in a cluster processing system, thermally treating the two-dimensional transition metal dichalcogenide layer to form a treated metal layer in a second processing chamber disposed in the cluster processing system, and forming a capping layer on the treated metal layer in a third processing chamber disposed in the cluster processing system.