title: Layer dependence and gas molecule absorption property in MoS2 Schottky diode with asymmetric metal contacts.
abstract: Surface potential measurement on atomically thin MoS2 flakes revealed the thickness dependence in Schottky barriers formed between high work function metal electrodes and MoS2 thin flakes. Schottky diode devices using mono- and multi-layer MoS2 channels were demonstrated by employing Ti and Pt contacts to form ohmic and Schottky junctions respectively. Characterization results indicated n-type behavior of the MoS2 thin flakes and the devices showed clear rectifying performance. We also observed the layer dependence in device characteristics and asymmetrically enhanced responses to NH3 and NO2 gases based on the metal work function and the Schottky barrier height change.
authors.affiliation: School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea.
authors.forename: Hyong Seo
authors.initials: HS
authors.lastname: Yoon
authors.affiliation: School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea.
authors.forename: Hang-Eun
authors.initials: HE
authors.lastname: Joe
authors.affiliation: School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea.
authors.forename: Sun
authors.initials: S
authors.lastname: Jun Kim
authors.affiliation: Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea.
authors.forename: Hee Sung
authors.initials: HS
authors.lastname: Lee
authors.affiliation: Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea.
authors.forename: Seongil
authors.initials: S
authors.lastname: Im
authors.affiliation: School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea.
authors.forename: Byung-Kwon
authors.initials: BK
authors.lastname: Min
authors.affiliation: School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Korea.
authors.forename: Seong Chan
authors.initials: SC
authors.lastname: Jun