Cluster Vacuum Processing for Oxidation-Free Metal Dichalcogenide Layers
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Solution Overview
Problem
The challenge in semiconductor manufacturing is the oxidation of transition metal dichalcogenides during processing, leading to poor interface quality and electrical performance due to exposure to air, which results in native oxides and contaminants on metal surfaces, affecting contact resistance and nucleation.
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 multiple processing functions can be achieved, but the substrate is exposed to ambient environmental conditions during transfer and queue time, resulting in oxidation and contamination of 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 environment. The substrate is processed through all steps without breaking vacuum, eliminating exposure to ambient air during transfers. This merging of processing functions within a controlled vacuum environment resolves the contradiction between versatility and oxidation prevention.
Solution Approach 2:
The patent uses a continuous vacuum environment as an inert atmosphere throughout the entire processing sequence. By maintaining vacuum conditions during substrate transfers between chambers and during queue time, the metal surface is protected from oxidation and contamination. The vacuum acts as a protective inert environment that enables versatile processing while preventing harmful atmospheric exposure.
2Ease of manufacture
If the metal line surface is exposed to air during processing, then standard atmospheric processing can be performed, but native oxides and contaminants accumulate on the metal surface, resulting in poor adhesion and high contact resistance
Solution Approach 1:
The patent maintains a continuous vacuum environment throughout all processing steps, preventing the metal surface from exposure to atmospheric oxygen and contaminants. This inert vacuum atmosphere protects the metal line surface from forming native oxides, ensuring good adhesion and low contact resistance while maintaining reliable electrical properties throughout manufacturing.
Solution Approach 2:
The patent performs cleaning and deposition processes in sequence within the vacuum environment before any potential exposure to air occurs. The metal surface is prepared and capped continuously under vacuum, preventing oxidation before it can occur. This preliminary protective action ensures interface quality is maintained throughout the manufacturing process.
3Productivity
If the substrate resides outside the process chamber during queue time, then processing flexibility is improved, but the metal surface accumulates native oxides and contaminants due to exposure to atmospheric oxygen and water
Solution Approach 1:
The patent merges the queue time into the continuous vacuum processing sequence by keeping the substrate within the cluster system's vacuum environment. All processing chambers are interconnected under vacuum, allowing the substrate to move between chambers and wait in queue positions without ever breaking vacuum. This eliminates atmospheric exposure during queue time while maintaining processing flexibility.
Solution Approach 2:
The patent maintains vacuum conditions as a continuous inert atmosphere throughout the entire processing sequence, including during queue time between processing steps. The substrate never exits the vacuum environment, preventing oxide accumulation while allowing flexible scheduling of processing operations within the protected atmosphere.
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 metal containing material 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 two-dimensional transition metal dichalcogenide layer on a substrate in a first processing chamber disposed in a cluster processing system
Implementation Method 3
forming a capping layer on the treated metal layer in a third processing chamber disposed in the cluster processing system
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.