TMDC Channel Formation for Low-Temperature Integrated Circuits
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Solution Overview
Problem
The semiconductor industry faces challenges in fabricating large-area transition metal dichalcogenide (TMDC) materials with high channel mobility and current ON/OFF ratio, as existing methods are inefficient in forming uniform TMDC layers with low thermal budget and minimal surface roughness.
Innovation Solution
A method involving a microwave plasma-enhanced chemical vapor deposition (PECVD) system is used to form TMDC layers by chalcogenizing transition metal layers, where the substrate is placed upside down to protect the TMDC layer from plasma damage, allowing for low-temperature synthesis and reduced thermal budget, resulting in high-quality TMDC layers with minimal surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to form TMDC layers, then the synthesis process is simpler, but the channel mobility and current ON/OFF ratio are insufficient
Solution Approach 1:
The synthesis process is divided into distinct stages: forming metal clusters on substrate, introducing chalcogen precursors, and controlled reaction phases. This segmentation allows precise control over TMDC layer formation, improving crystal quality and electrical properties while maintaining manufacturability through standardized process steps.
Solution Approach 2:
The patent employs precise control of synthesis parameters including temperature profiles, precursor concentrations, reaction time, and atmospheric conditions. By optimizing these parameters, the method achieves high channel mobility and current ON/OFF ratio, resolving the contradiction between performance and process simplicity.
2Reliability
If high-temperature synthesis is used to improve TMDC layer quality, then the channel mobility improves, but the thermal budget increases
Solution Approach 1:
The method utilizes phase transitions of chalcogen precursors (from solid to vapor phase) to deliver reactive species at controlled temperatures. This allows TMDC layer formation at reduced temperatures compared to conventional high-temperature synthesis, maintaining channel mobility while reducing thermal budget for subsequent processing steps.
Solution Approach 2:
Chalcogen precursor molecules act as intermediaries that mediate the reaction between metal clusters and sulfur atoms. This intermediary mechanism enables low-temperature synthesis by providing a gentler reaction pathway, avoiding the need for high temperatures while still achieving high-quality TMDC layers with good channel mobility.
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 enables the synthesis of TMDC layers with high channel mobility and current ON/OFF ratio, achieving a low thermal budget and maintaining surface smoothness, which is crucial for advanced semiconductor devices.
Implementation Method 1
a microwave plasma-enhanced chemical vapor deposition (PECVD) system is used to form TMDC layers by chalcogenizing transition metal layers
Implementation Method 2
microwave plasma-enhanced chemical vapor deposition (PECVD) system is used to form TMDC layers by chalcogenizing transition metal layers
Implementation Method 3
form TMDC layers by chalcogenizing transition metal layers
Data Source
AI summary
A method for forming an integrated circuit device is provided. The method includes forming a transistor over a frontside of a substrate; forming an interconnect structure over the transistor; depositing a first transition metal layer over the interconnect structure; performing a plasma treatment to turn the first transition metal layer into a first transition metal dichalcogenide layer; forming a dielectric layer over the first transition metal dichalcogenide layer; forming a first gate electrode over the dielectric layer and a first portion of the first transition metal dichalcogenide layer; and forming a first source contact and a first drain contact respectively connected with a second portion and a third portion of the first transition metal dichalcogenide layer, the first portion of the first transition metal dichalcogenide layer being between the second and third portions of the first transition metal dichalcogenide layers.