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Gas molecule sensing of van der Waals tunnel field effect transistors

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Title
Gas molecule sensing of van der Waals tunnel field effect transistors
Author(s)
Hong Kyw Choi; Jaesung Park; Nojoon Myoung; Ho-Jong Kim; Jin Sik Choi; Young Kyu Choi; Chi-Young Hwang; Jin Tae Kim; Serin Park; Yoonsik Yi; Soo Kyung Chang; Hee Chul Park; Chanyong Hwang; Choon-Gi Choi; Young-Jun Yu
Publication Date
2017-12
Journal
NANOSCALE, v.9, no.47, pp.18644 - 18650
Publisher
ROYAL SOC CHEMISTRY
Abstract
van der Waals (vdW) heterostructures with two-dimensional (2D) crystals such as graphene, hexagonal boron nitride (hBN) and transition metal dichalcogenides (TMDCs) allow us to demonstrate atomically thin field-effect transistors (FETs), photodetectors (PDs) and photovoltaic devices capable of higher performance and greater stability levels than conventional devices. Although there have been studies of gas molecule sensing with 2D crystal channels, vdW heterostructures based on 2D crystals have not been employed thus far. Here, utilizing graphene/WS2/graphene (G/WS2/G) vdW heterostructure tunnel FETs, we demonstrate the rectification behavior of the sensitivity signal by tuning the WS2 potential barriers as a function of the gas molecule concentration and devise a fingerprint map of the sensitivity variation corresponding to an individual ratio of two different molecules in a gas mixture. Because the separation of different gas molecule concentrations from gas mixtures is in high demand in the gas-sensing research field, this result will greatly assist in the progress on selective gas sensing. This journal is © The Royal Society of Chemistry 2017
URI
https://pr.ibs.re.kr/handle/8788114/4145
ISSN
2040-3364
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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