Quantum Transport in Two-Dimensional WS$_2$ with High-Efficiency Carrier Injection Through Indium Alloy Contacts
| Autor: | Yan Wang, Shi Wun Tong, Zi En Ooi, Lay Kee Ang, Liemao Cao, Manish Chhowalla, Kuan Eng Johnson Goh, Jing Yee Chee, Chit Siong Lau, Yee Sin Ang, Tong Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Schottky barrier Alloy General Physics and Astronomy chemistry.chemical_element FOS: Physical sciences 02 engineering and technology Chemical vapor deposition engineering.material 010402 general chemistry 01 natural sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science Quantum Quantum tunnelling Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics business.industry Bilayer General Engineering Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry engineering Optoelectronics Density functional theory 0210 nano-technology business Indium |
| DOI: | 10.48550/arxiv.2102.02489 |
| Popis: | Two-dimensional transition metal dichalcogenides (TMDCs) have properties attractive for optoelectronic and quantum applications. A crucial element for devices is the metal-semiconductor interface. However, high contact resistances have hindered progress. Quantum transport studies are scant as low-quality contacts are intractable at cryogenic temperatures. Here, temperature-dependent transfer length measurements are performed on chemical vapour deposition grown single-layer and bilayer WS$_2$ devices with indium alloy contacts. The devices exhibit low contact resistances and Schottky barrier heights (\sim10 k$\Omega$\si{\micro\metre} at 3 K and 1.7 meV). Efficient carrier injection enables high carrier mobilities ($\sim$190 cm$^2$V$^{-1}$s$^{-1}$) and observation of resonant tunnelling. Density functional theory calculations provide insights into quantum transport and properties of the WS$_2$-indium interface. Our results reveal significant advances towards high-performance WS$_2$ devices using indium alloy contacts. Comment: 5 Figures |
| Databáze: | OpenAIRE |
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