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2 results on '"Sung Kwan Lim"'

1. Operation Mechanism of a MoS2/BP Heterojunction FET

Author

Byoung Hun Lee, Soo Cheol Kang, Tae Jin Yoo, Sung Kwan Lim, Hyeon Jun Hwang, and Sang Kyung Lee

Subjects
Materials science, band-to-band tunneling (BTBT), General Chemical Engineering, 02 engineering and technology, black phosphorus, 2D/2D heterojunction, 01 natural sciences, Black phosphorus, Article, law.invention, lcsh:Chemistry, chemistry.chemical_compound, Depletion region, law, 0103 physical sciences, junction FET, tunneling FET, General Materials Science, Tunneling current, Molybdenum disulfide, Quantum tunnelling, 010302 applied physics, business.industry, Transistor, Heterojunction, 021001 nanoscience & nanotechnology, tunneling diode, lcsh:QD1-999, chemistry, Subthreshold swing, MoS2, Optoelectronics, 0210 nano-technology, business
Abstract

The electrical characteristics and operation mechanism of a molybdenum disulfide/black phosphorus (MoS2/BP) heterojunction device are investigated herein. Even though this device showed a high on-off ratio of over 1 &times, 107, with a lower subthreshold swing of ~54 mV/dec and a 1fA level off current, its operating mechanism is closer to a junction field-effect transistor (FET) than a tunneling FET. The off-current of this device is governed by the depletion region in the BP layer, and the band-to-band tunneling current does not contribute to the rapid turn-on and extremely low off-current.

Published
2018

2. Metal Decoration Effects on the Gas-Sensing Properties of 2D Hybrid-Structures on Flexible Substrates.

Author

Byungjin Cho, Jongwon Yoon, Sung Kwan Lim, Ah Ra Kim, Sun-Young Choi, Dong-Ho Kim, Kyu Hwan Lee, Byoung Hun Lee, Heung Cho Ko, and Myung Gwan Hahm

Subjects
METALS, FLEXIBLE structures, GRAPHENE, ELECTRODES, WEARABLE technology
Abstract

We have investigated the effects of metal decoration on the gas-sensing properties of a device with two-dimensional (2D) molybdenum disulfide (MoS2) flake channels and graphene electrodes. The 2D hybrid-structure device sensitively detected NO2 gas molecules (>1.2 ppm) as well as NH3 (>10 ppm). Metal nanoparticles (NPs) could tune the electronic properties of the 2D graphene/MoS2 device, increasing sensitivity to a specific gas molecule. For instance, palladium NPs accumulate hole carriers of graphene/MoS2, electronically sensitizing NH3 gas molecules. Contrarily, aluminum NPs deplete hole carriers, enhancing NO2 sensitivity. The synergistic combination of metal NPs and 2D hybrid layers could be also applied to a flexible gas sensor. There was no serious degradation in the sensing performance of metal-decorated MoS2 flexible devices before/after 5000 bending cycles. Thus, highly sensitive and endurable gas sensor could be achieved through the metal-decorated 2D hybrid-structure, offering a useful route to wearable electronic sensing platforms. [ABSTRACT FROM AUTHOR]

Published
2015
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