title: Photoelectrochemical behavior of n-type Si(111) electrodes coated with a single layer of graphene.
abstract: The behavior of graphene-coated n-type Si(111) photoanodes was compared to the behavior of H-terminated n-type Si(111) photoanodes in contact with aqueous K3[Fe(CN)6]/K4[Fe(CN)6] as well as in contact with a series of outer-sphere, one-electron redox couples in nonaqueous electrolytes. The n-Si/Graphene electrodes exhibited stable short-circuit photocurrent densities of over 10 mA cm(-2) for >1000 s of continuous operation in aqueous electrolytes, whereas n-Si-H electrodes yielded a nearly complete decay of the current density within ~100 s. The values of the open-circuit photovoltages and the flat-band potentials of the Si were a function of both the Fermi level of the graphene and the electrochemical potential of the electrolyte solution, indicating that the n-Si/Graphene did not form a buried junction with respect to the solution contact.
authors.affiliation: Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.
authors.forename: Adam C
authors.initials: AC
authors.lastname: Nielander
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Bierman
authors.forename: Nicholas
authors.initials: N
authors.lastname: Petrone
authors.forename: Nicholas C
authors.initials: NC
authors.lastname: Strandwitz
authors.forename: Shane
authors.initials: S
authors.lastname: Ardo
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.forename: James
authors.initials: J
authors.lastname: Hone
authors.forename: Nathan S
authors.initials: NS
authors.lastname: Lewis