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Published on: April 12, 2018
Electric Transport in Few-Layer ReSe2 Transistors Modulated by Air Pressure and Light
Enver Faella1,2, Kimberly Intonti1, Loredana Viscardi1
1Department of Physics "E.R. Caianiello", University of Salerno, 84084 Fisciano, SA, Italy.
Abstract:
We report the fabrication and optoelectronic characterization of field-effect transistors (FETs) based on few-layer ReSe2. The devices show n-type conduction due to the Cr contacts that form low Schottky barriers with the ReSe2 nanosheet. We show that the optoelectronic performance of these FETs is strongly affected by air pressure, and it undergoes a dramatic increase in conductivity when the pressure is lowered below the atmospheric one. Surface-adsorbed oxygen and water molecules are very effective in doping ReSe2; hence, FETs based on this two-dimensional (2D) semiconductor can be used as an effective air pressure gauge. Finally, we report negative photoconductivity in the ReSe2 channel that we attribute to a back-gate-dependent trapping of the photo-excited charges.
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