LAUSR

Graphene, the two dimensional monolayer of carbon, is an essential building block for advanced electronic applications. Graphene is often integrated with bulk conductors, metals and semiconductors, for optoelectronic applications. The semimetal bismuth, that shares many electronic properties with these other conductors, is interesting because like graphene, it is a gapless conductor of high electronic mobility with linear dispersion relations and low electronic density. We studied the doping of graphene by Bi and the interfacial electric dipole. Graphene Raman spectroscopy results show that there is a very large charge transfer between graphene and bismuth. This doping is larger than in the interfaces of graphene with metals such as Cu and semiconductors such as Si. Our findings are in good agreement with recent theoretical results for graphene bismuth interfaces. We also present a demonstration of zerobias photocurrent generation that is enabled by the electric dipole at the graphene bismuth interface. *) [email protected]