Cheul Hyun Yoon, Seok Hyun Yoon, Gil Su Jeon, Jun Yeong Choe, Gyeong Min Seo, Byoung Don Kong
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引用次数: 0
Abstract
We have explored the potential of nanoscale vacuum channel transistors that utilize the edges of transition-metal dichalcogenides (TMDCs) as field emitters for high-frequency applications. The angstrom-scale thickness of monolayer TMDCs in a two-dimensional structure induces a strong field enhancement effect at the edge, facilitating cold emission. Additionally, their semiconducting nature enables control of the emission current by adjusting the tunneling barrier height through Fermi level control via the gate structure. We analyzed the field emission properties of monolayer TMDCs (MoS2, MoSe2, and WS2), examining their current-voltage characteristics based on Fowler-Nordheim theory within a three-terminal vacuum channel transistor system. In this configuration, the emitter is aligned towards the drain electrode, parallel to the substrate, and the carrier dynamics were investigated in detail within the TMDC channels. We further calculated the screening effect induced by gate bias modulation, taking into account the extent of the monolayer TMDC edge protrusion into the vacuum channel. Additionally, we studied the distinctive modulation of the field enhancement factor, which can be adjusted through gate bias control. Finally, under a source-drain bias of 100 V, the transistors demonstrated both cutoff and maximum oscillation frequencies in the sub-terahertz to terahertz range, confirming their high-frequency operational potential.
期刊介绍:
Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.