Photocurrent response in few-layered ReS2 devices with short and open circuits

Abstract

We perform photocurrent measurements in few-layered ReS 2 with multiple electrodes using scanning photocurrent microscopy and investigate the photocurrent mechanism of the ReS 2 device. In particular, we have investigated how the photocurrent responds to the different configurations of a current-collecting electrode, ground electrodes and floating electrodes. When all electrodes are electrically connected, the circuit is short. If any electrodes are floating, we refer the circuit is open. Remarkably, open-circuit devices show a similar photocurrent response with short-circuit devices. The observed photocurrent is attributed to the electron response to the modulating electric field that is generated by time-varying laser heating. We further show that the observed photocurrent is tunable by gate voltages.

ReS2 on GaN Photodetector Using H+ Ion-Cut Technology

“…This makes ReS 2 potentially useful as a saturable absorber and photoelectrode material in optics and photoelectron chemistry. 11 − 13 Second, it has been proved theoretically and experimentally that the optical and electrical properties of bulk ReS 2 and monolayer ReS 2 are almost identical. 14 This allows researchers to study the microphysical properties of ReS 2 without being limited by the size of the material and the number of layers.…”

“…Compared with traditional TMDs, ReS 2 has distinctive properties: first, ReS 2 is a direct band gap semiconductor from bulk material to monolayer material, in which the band gap is 1.35 eV in bulk and rises to 1.43 eV in monolayer. This makes ReS 2 potentially useful as a saturable absorber and photoelectrode material in optics and photoelectron chemistry. − Second, it has been proved theoretically and experimentally that the optical and electrical properties of bulk ReS 2 and monolayer ReS 2 are almost identical . This allows researchers to study the microphysical properties of ReS 2 without being limited by the size of the material and the number of layers.…”