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Abstract
This study investigates vertically stacked CVD grown ReS2/MoS2 unipolar heterostructure device as Field Effect Transistor (FET) device wherein ReS2 on top acts as drain and MoS2 at bottom acts as source. The electrical measurements of ReS2/MoS2 FET device were carried out and variation in Ids (drain current) Vs Vds (drain voltage) for different Vgs (gate voltage) revealing the n-type device characteristics. Furthermore, the threshold voltage was calculated at the gate bias voltage corresponding to maximum transconductance (gm) value which is ~ 12 V. The mobility of the proposed ReS2/MoS2 heterojunction FET device was calculated as 60.97 cm2 V−1 s−1. The band structure of the fabricated vDW heterostructure was extracted utilizing ultraviolet photoelectron spectroscopy and the UV–visible spectroscopy revealing the formation of 2D electron gas (2DEG) at the ReS2/MoS2 interface which explains the high carrier mobility of the fabricated FET. The field effect behavior is studied by the modulation of the barrier height across heterojunction and detailed explanation is presented in terms of the charge transport across the heterojunction.
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Details
1 BITS Pilani Hyderabad Campus, Department of Electrical and Electronics Engineering, Hyderabad, India (GRID:grid.466497.e) (ISNI:0000 0004 1772 3598)
2 Universidad Nacional Autónoma de México, Querétaro, México (GRID:grid.9486.3) (ISNI:0000 0001 2159 0001)
3 BITS Pilani Hyderabad Campus, Department of Electrical and Electronics Engineering, Hyderabad, India (GRID:grid.466497.e) (ISNI:0000 0004 1772 3598); Birla Institute of Technology and Science Pilani, Hyderabad Campus, Materials Center for Sustainable Energy and Environment, Hyderabad, India (GRID:grid.418391.6) (ISNI:0000 0001 1015 3164)