title: High voltage hybrid organic photovoltaics using a zinc oxide acceptor and a subphthalocyanine donor.
abstract: We demonstrate hybrid organic photovoltaic (HOPV) bilayer devices with very high open circuit voltages (VOC) of 1.18 V based on a sol-gel processed zinc oxide (ZnO) acceptor and a vacuum deposited boron subphthalocyanine chloride (SubPc) donor layer. X-ray photoelectron spectroscopy (XPS) and Kelvin Probe (KP) measurements of the ZnO/SubPc interface show that the ZnO preparation conditions have a significant impact on the film composition and the electronic properties of the interface, in particular the work function and interface gap energy. Low temperature processing at 120 °C resulted in a ZnO work function of 3.20 eV and the highest VOC of 1.18 V, a consequence of the increased interface gap energy.
authors.affiliation: Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK. T.S.Jones@warwick.ac.uk.
authors.forename: Chloe Argent
authors.initials: CA
authors.lastname: Dearden
authors.forename: Marc
authors.initials: M
authors.lastname: Walker
authors.forename: Nicola
authors.initials: N
authors.lastname: Beaumont
authors.forename: Ian
authors.initials: I
authors.lastname: Hancox
authors.forename: Natalie K
authors.initials: NK
authors.lastname: Unsworth
authors.forename: Paul
authors.initials: P
authors.lastname: Sullivan
authors.forename: Chris F
authors.initials: CF
authors.lastname: McConville
authors.forename: Tim S
authors.initials: TS
authors.lastname: Jones