title: Improved Exciton Dissociation at Semiconducting Polymer:ZnO Donor:Acceptor Interfaces via Nitrogen Doping of ZnO.
abstract: Exciton dissociation at the zinc oxide/poly(3-hexylthiophene) (ZnO/P3HT) interface as a function of nitrogen doping of the zinc oxide, which decreases the electron concentration from approximately 1019cm-3to 1017cm-3, is reported. Exciton dissociation and device photocurrent are strongly improved with nitrogen doping. This improved dissociation of excitons in the conjugated polymer is found to result from enhanced light-induced de-trapping of electrons from the surface of the nitrogen-doped ZnO. The ability to improve the surface properties of ZnO by introducing a simple nitrogen dopant has general applicability.
authors.affiliation: Department of Physics University of Cambridge Cavendish Laboratory JJ Thomson Ave Cambridge, CB3 0HE, UK E-mail: kpdm2@cam.ac.uk.
authors.forename: Kevin P
authors.initials: KP
authors.lastname: Musselman
authors.affiliation: Department of Physics University of Cambridge Cavendish Laboratory JJ Thomson Ave Cambridge, CB3 0HE, UK E-mail: kpdm2@cam.ac.uk.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Albert-Seifried
authors.affiliation: Department of Materials Science & Metallurgy University of Cambridge 27 Charles Babbage Road, Cambridge, CB3 0FS, UK.
authors.forename: Robert L Z
authors.initials: RL
authors.lastname: Hoye
authors.affiliation: Department of Physics University of Cambridge Cavendish Laboratory JJ Thomson Ave Cambridge, CB3 0HE, UK E-mail: kpdm2@cam.ac.uk.
authors.forename: Aditya
authors.initials: A
authors.lastname: Sadhanala
authors.affiliation: Department of Materials Science & Metallurgy University of Cambridge 27 Charles Babbage Road, Cambridge, CB3 0FS, UK ; Instituto de Ciencia de Materiales de Barcelona ICMAB-CSIC, Campus de la UAB Bellaterra, 08193, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Muñoz-Rojas
authors.affiliation: Department of Materials Science & Metallurgy University of Cambridge 27 Charles Babbage Road, Cambridge, CB3 0FS, UK.
authors.forename: Judith L
authors.initials: JL
authors.lastname: MacManus-Driscoll
authors.affiliation: Department of Physics University of Cambridge Cavendish Laboratory JJ Thomson Ave Cambridge, CB3 0HE, UK E-mail: kpdm2@cam.ac.uk.
authors.forename: Richard H
authors.initials: RH
authors.lastname: Friend
keywords: Kelvin probe microscopy; P3HT; doping; hybrid photovoltaics; zinc oxide