title: Ultrafast response of monolayer molybdenum disulfide photodetectors.
abstract: The strong light emission and absorption exhibited by single atomic layer transitional metal dichalcogenides in the visible to near-infrared wavelength range make them attractive for optoelectronic applications. In this work, using two-pulse photovoltage correlation technique, we show that monolayer molybdenum disulfide photodetector can have intrinsic response times as short as 3 ps implying photodetection bandwidths as wide as 300 GHz. The fast photodetector response is a result of the short electron-hole and exciton lifetimes in this material. Recombination of photoexcited carriers in most two-dimensional metal dichalcogenides is dominated by nonradiative processes, most notable among which is Auger scattering. The fast response time, and the ease of fabrication of these devices, make them interesting for low-cost ultrafast optical communication links.
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca 14853, New York, USA.
authors.forename: Haining
authors.initials: H
authors.lastname: Wang
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca 14853, New York, USA.
authors.forename: Changjian
authors.initials: C
authors.lastname: Zhang
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca 14853, New York, USA.
authors.forename: Weimin
authors.initials: W
authors.lastname: Chan
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca 14853, New York, USA.
authors.forename: Sandip
authors.initials: S
authors.lastname: Tiwari
authors.affiliation: School of Electrical and Computer Engineering, Cornell University, Ithaca 14853, New York, USA.
authors.forename: Farhan
authors.initials: F
authors.lastname: Rana