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Photocurrent Switching of Monolayer MoS2 Using a Metal–Insulator Transition
journal contribution
posted on 2016-12-28, 00:00 authored by Jin Hee Lee, Hamza Zad Gul, Hyun Kim, Byoung Hee Moon, Subash Adhikari, Jung Ho Kim, Homin Choi, Young Hee Lee, Seong Chu LimWe
achieve switching on/off the photocurrent of monolayer molybdenum
disulfide (MoS2) by controlling the metal–insulator
transition (MIT). N-type semiconducting MoS2 under 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 MoS2 is 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 MoS2 can be switched on/off by appropriately
controlling the MIT transition by means of gate bias.