title: Laser patterning of epitaxial graphene for Schottky junction photodetectors.
abstract: Large-area patterning of epitaxial graphene for Schottky junction photodetectors has been demonstrated with a simple laser irradiation method. In this method, semimetal-semiconductor Schottky junctions are created in a controllable pattern between epitaxial graphene (EG) and laser-modified epitaxial graphene (LEG). The zero-biased EG-LEG-EG photodetector exhibits a nanosecond and wavelength-independent photoresponse in a broad-band spectrum from ultraviolet (200 nm) through visible to infrared light (1064 nm), distinctively different from conventional photon detectors. An efficient external photoresponsivity (or efficiency) of ∼0.1 A·W(-1) is achieved with a biased interdigitated EG-LEG-EG photodetector. The fabrication method presented here opens a viable route to carbon optoelectronics for a fast and highly efficient photoconductive detector.
authors.affiliation: Department of Physics, National University of Singapore, Singapore 117542, Singapore.
authors.forename: Ram Sevak
authors.initials: RS
authors.lastname: Singh
authors.forename: Venkatram
authors.initials: V
authors.lastname: Nalla
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Andrew Thye Shen
authors.initials: AT
authors.lastname: Wee
authors.forename: Wei
authors.initials: W
authors.lastname: Ji