Ultra-high Photoresponsivity in Suspended Metal-Semiconductor-Metal Mesoscopic Multilayer MoS2 Broadband Detector from UV-to-IR with Low Schottky Barrier Contacts.

ABSTRACT: The design, fabrication, and characterization of ultra-high responsivity photodetectors based on mesoscopic multilayer MoS2 is presented, which is a less explored system compared to direct band gap monolayer MoS2 that has received increasing attention in recent years. The device architecture is comprised of a metal-semiconductor-metal (MSM) photodetector, where Mo was used as the contact metal to suspended MoS2 membranes. The photoresponsivity [Formula: see text] was measured to be ~1.4?×?104?A/W, which is?>?104 times higher compared to prior reports, while the detectivity D* was computed to be ~2.3?×?1011 Jones at 300?K at an optical power P of ~14.5?pW and wavelength ? of ~700?nm. In addition, the dominant photocurrent mechanism was determined to be the photoconductive effect (PCE), while a contribution from the photogating effect was also noted from trap-states that yielded a wide spectral photoresponse from UV-to-IR (400?nm to 1100?nm) with an external quantum efficiency (EQE) ~104. From time-resolved photocurrent measurements, a decay time ? d ~ 2.5 ms at 300?K was measured from the falling edge of the photogenerated waveform after irradiating the device with a stream of incoming ON/OFF white light pulses.

SUBMITTER: Saenz GA 

PROVIDER: S-EPMC5775306 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature