title: Functionalised hexagonal-domain graphene for position-sensitive photodetectors.
abstract: Graphene's unique photoresponse has been largely used in a multitude of optoelectronics applications ranging from broadband photodetectors to wave-guide modulators. In this work we extend the range of applications to position-sensitive photodetectors (PSDs) using FeCl3-intercalated hexagonal domains of graphene grown by atmospheric pressure chemical vapour deposition (APCVD). The FeCl3-based chemical functionalisation of APCVD graphene crystals is affected by the presence of wrinkles and results in a non-uniform doping of the graphene layers. This doping profile creates multiple p-p+photoactive junctions which show a linear and bipolar photoresponse with respect to the position of a focused light spot, which is ideal for the realization of a PSD. Our study paves the way towards the fabrication of flexible and transparent PSDs that could be embedded in smart textile and wearable electronics.
authors.affiliation: Centre for Graphene Science, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, United Kingdom.
authors.forename: Adolfo
authors.initials: A
authors.lastname: De Sanctis
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Barnes
authors.forename: Iddo
authors.initials: I
authors.lastname: Amit
authors.forename: Monica F
authors.initials: MF
authors.lastname: Craciun
authors.forename: Saverio
authors.initials: S
authors.lastname: Russo