title: Functionalization of boron-doped nanocrystalline diamond with N3 dye molecules.
abstract: N3 dye molecules [cis-bis(isothiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylato)ruthenium(II)] are covalently attached to boron-doped nanocrystalline diamond (B:NCD) thin films through a combination of coupling chemistries, i.e., diazonium, Suzuki, and EDC-NHS. X-ray and ultraviolet photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy are used to verify the covalent bonding of the dye on the B:NCD surface (compared to a hydrogen-terminated reference). The spectroscopic results confirm the presence of a dense N3 chromophore layer, and the positions of the frontier orbitals of the dye relative to the band edge of the B:NCD thin film are inferred as well. Proof-of-concept photoelectrochemical measurements show a strong increase in the photocurrent compared to non-dye-functionalized B:NCD films. This study opens up the possibility of applying N3-sensitized B:NCD thin films as hole conductors in dye-sensitized solar cells.
authors.affiliation: Institute for Materials Research (IMO), Hasselt University , B-3590 Diepenbeek, Belgium.
authors.forename: W S
authors.initials: WS
authors.lastname: Yeap
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: D
authors.initials: D
authors.lastname: Bevk
authors.forename: A
authors.initials: A
authors.lastname: Pasquarelli
authors.forename: L
authors.initials: L
authors.lastname: Lutsen
authors.forename: M
authors.initials: M
authors.lastname: Fahlman
authors.forename: W
authors.initials: W
authors.lastname: Maes
authors.forename: K
authors.initials: K
authors.lastname: Haenen