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A vertical WSe2-MoSe2 p-n heterostructure with tunable gate rectification.

ABSTRACT: Here, we report the synthesis of a vertical MoSe2/WSe2 p-n heterostructure using a sputtering-CVD method. Unlike the conventional CVD method, this method produced a continuous MoSe2/WSe2 p-n heterostructure. WSe2 and MoSe2 back-gated field effect transistors (FETs) exhibited good gate modulation behavior, and high hole and electron mobilities of ∼2.2 and ∼15.1 cm2 V-1 s-1, respectively. The fabricated vertical MoSe2/WSe2 p-n diode showed rectifying I-V behavior with back-gate tunability. The rectification ratio of the diode was increased with increasing gate voltage, and was increased from ∼18 to ∼1600 as the gate bias increased from -40 V to +40 V. This is attributed to the fact that the barrier height between p-WSe2 and n-MoSe2 is modulated due to the back-gate bias. The rectification ratio is higher than the previously reported values for the TMDC p-n heterostructure grown by CVD.

SUBMITTER: Liu H 

PROVIDER: S-EPMC9082623 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature

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A vertical WSe<sub>2</sub>-MoSe<sub>2</sub> p-n heterostructure with tunable gate rectification.

Liu Hailing H   Hussain Sajjad S   Ali Asif A   Naqvi Bilal Abbas BA   Vikraman Dhanasekaran D   Jeong Woonyoung W   Song Wooseok W   An Ki-Seok KS   Jung Jongwan J  

RSC advances 20180717 45

Here, we report the synthesis of a vertical MoSe<sub>2</sub>/WSe<sub>2</sub> p-n heterostructure using a sputtering-CVD method. Unlike the conventional CVD method, this method produced a continuous MoSe<sub>2</sub>/WSe<sub>2</sub> p-n heterostructure. WSe<sub>2</sub> and MoSe<sub>2</sub> back-gated field effect transistors (FETs) exhibited good gate modulation behavior, and high hole and electron mobilities of ∼2.2 and ∼15.1 cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup>, respectively. The fabrica  ...[more]

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