期刊
NANO LETTERS
卷 17, 期 2, 页码 673-678出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03689
关键词
MoS2; metal-insulator transition; photocurrent switching; optical phonon scattering; electron-electron scattering
类别
资金
- [IBS-R011-D1]
We 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 controlling the MIT transition by means of gate bias.
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