Operation Mechanism of a MoS₂/BP Heterojunction FET
Sung Kwan Lim1,2, Soo Cheol Kang3,4, Tae Jin Yoo5,6
1Center for Emerging Electronic Devices and Systems (CEEDS), GIST, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Korea. lsk8410@gist.ac.kr.
Abstract:
The electrical characteristics and operation mechanism of a molybdenum disulfide/black phosphorus (MoS₂/BP) heterojunction device are investigated herein. Even though this device showed a high on-off ratio of over 1 × 10⁷, with a lower subthreshold swing of ~54 mV/dec and a 1fA level off current, its operating mechanism is closer to a junction field-effect transistor (FET) than a tunneling FET. The off-current of this device is governed by the depletion region in the BP layer, and the band-to-band tunneling current does not contribute to the rapid turn-on and extremely low off-current.
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