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Substrate modified thermal stability of mono- and few-layer MoS2
Xuewen Wang1, Wen Fan, Ziwei Fan
1State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. liuk@tsinghua.edu.cn.
Nanoscale
|February 8, 2018
Summary
Substrate choice significantly impacts the thermal stability of molybdenum disulfide (MoS2) layers. Monolayer MoS2 is more stable on some substrates, while few-layer MoS2 is more stable on others, depending on interactions.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Physics
Background:
- Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) like molybdenum disulfide (MoS2) are crucial for advanced electronic devices.
- Ensuring the thermal stability of ultrathin MoS2 is vital due to unavoidable heating in device operation and harsh environments.
Purpose of the Study:
- To investigate the influence of substrates on the thermal stability of monolayer and few-layer MoS2.
- To understand the mechanisms behind substrate-mediated thermal degradation and identify design rules for MoS2-based electronics.
Main Methods:
- Thermal annealing of monolayer and few-layer MoS2 on different substrates (Al2O3, SiO2, mica) under atmospheric air and vacuum.
- Microscopic analysis to observe the formation of triangular etching holes as an indicator of thermal degradation.
- Comparison of thermal stability between pristine and defective chemical-vapor-deposited (CVD) MoS2 samples.
Main Results:
- Substrate type critically affects MoS2 thermal stability; monolayer MoS2 is more stable on Al2O3 and SiO2, whereas few-layer MoS2 is more stable on mica.
- Triangular etching holes form on MoS2 above a specific temperature threshold, indicating degradation initiation from defect sites.
- The substrate effect on thermal stability diminishes for defective CVD-grown MoS2.
Conclusions:
- The thermal stability of MoS2 is governed by a balance between MoS2-substrate and MoS2-MoS2 interlayer interactions.
- Substrate engineering offers a pathway for controlling MoS2 thermal properties and enabling controlled patterning for device applications.
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