title: Enhanced photoresponse in monolayer hydrogenated graphene photodetector.
abstract: We report the photoresponse of a hydrogenated graphene (H-graphene)-based infrared (IR) photodetector that is 4 times higher than that of pristine graphene. An enhanced photoresponse in H-graphene is attributed to the longer photoinduced carrier lifetime and hence a higher internal quantum efficiency of the device. Moreover, a variation in the angle of incidence of IR radiation demonstrated a nonlinear photoresponse of the detector, which can be attributed to the photon drag effect. However, a linear dependence of the photoresponse is revealed with different incident powers for a given angle of IR incidence. This study presents H-graphene as a tunable photodetector for advanced photoelectronic devices with higher responsivity. In addition, in situ tunability of the graphene bandgap enables achieving a cost-effective technique for developing photodetectors without involving any external treatments.
authors.affiliation: Department of Instrumentation and Applied Physics, ‡Department of Physics, Indian Institute of Science , Bangalore, India 560012.
authors.forename: Prarthana
authors.initials: P
authors.lastname: Gowda
authors.forename: Dipti R
authors.initials: DR
authors.lastname: Mohapatra
authors.forename: Abha
authors.initials: A
authors.lastname: Misra
keywords: H-graphene; angle of incidence; hydrogenation; infrared; photodetectors