title: Photocurrent Switching of Monolayer MoS2Using a Metal-Insulator Transition.
abstract: We achieve switching on/off the photocurrent of monolayer molybdenum disulfide (MoS2) by controlling the metal-insulator transition (MIT). N-type semiconducting MoS2under a large negative gate bias generates a photocurrent attributed to the increase of excess carriers in the conduction band by optical excitation. However, under a large positive gate bias, a phase shift from semiconducting to metallic MoS2is caused, and the photocurrent by excess carriers in the conduction band induced by the laser disappears due to enhanced electron-electron scattering. Thus, no photocurrent is detected in metallic MoS2. Our results indicate that the photocurrent of MoS2can be switched on/off by appropriately controlling the MIT transition by means of gate bias.
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.|Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors.forename: Jin Hee
authors.identifier: 0000-0002-6746-7508
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.|Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors.forename: Hamza Zad
authors.initials: HZ
authors.lastname: Gul
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.|Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors.forename: Hyun
authors.initials: H
authors.lastname: Kim
authors.affiliation: Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors.forename: Byoung Hee
authors.initials: BH
authors.lastname: Moon
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.|Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors.forename: Subash
authors.initials: S
authors.lastname: Adhikari
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.|Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.|Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors.forename: Homin
authors.initials: H
authors.lastname: Choi
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.|Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors.forename: Young Hee
authors.initials: YH
authors.lastname: Lee
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon 16419, Republic of Korea.|Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea.
authors.forename: Seong Chu
authors.identifier: 0000-0002-0751-1458
authors.initials: SC
authors.lastname: Lim
keywords: MoS2; electron−electron scattering; metal−insulator transition; optical phonon scattering; photocurrent switching