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학술지 High Performance Self-gating Graphene/MoS2 Diode Enabled by Asymmetric Contacts
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무하마드칸, 라티서빈, 이창희, 김윤섭, 김하늘, 황동욱, 윤선진, 윤두협, 겐지와타나베, 다카시다니구치, 김길호
Nanotechnology, v.29 no.39, pp.1-6
Institute of Physics (IOP)
18HB1100, 차세대 신기능 스마트디바이스 플랫폼을 위한 대면적 이차원소재 및 소자 원천기술 개발, 윤선진
A graphene-MoS2 (GM) heterostructure based diode is fabricated using asymmetric contacts to MoS2, as well as an asymmetric top gate (ATG). The GM diode exhibits a rectification ratio of 5 from asymmetric contacts, which is improved to 105 after the incorporation of an ATG. This improvement is attributed to the asymmetric modulation of carrier concentration and effective Schottky barrier height (SBH) by the ATG during forward and reverse bias. This is further confirmed from the temperature dependent measurement, where a difference of 0.22 eV is observed between the effective SBH for forward and reverse bias. Moreover, the rectification ratio also depends on carrier concentration in MoS2 and can be varied with the change in temperature as well as back gate voltage. Under laser light illumination, the device demonstrates strong opto-electric response with 100 times improvement in the relative photo current, as well as a responsivity of 1.9 A W-1 and a specific detectivity of 2.4 ×1010 Jones. These devices can also be implemented using other two dimensional (2D) materials and suggest a promising approach to incorporate diverse 2D materials for future nano-electronics and optoelectronics applications.
KSP 제안 키워드
2D material, Asymmetric modulation, Asymmetric top, Carrier concentration, Forward and reverse, High performance, Laser light, Reverse bias, Schottky barrier height, Temperature-dependent, asymmetric contacts