title: The effect of oxygen exposure on pentacene electronic structure.
abstract: We use ultraviolet photoelectron spectroscopy to investigate the effect of oxygen and air exposure on the electronic structure of pentacene single crystals and thin films. It is found that O(2) and water do not react noticeably with pentacene, whereas singlet oxygen/ozone readily oxidize the organic compound. Also, we obtain no evidence for considerable p-type doping of pentacene by O(2) at low pressure. However, oxygen exposure lowers the hole injection barrier at the interface between Au and pentacene by 0.25 eV, presumably due to a modification of the Au surface properties.
authors.affiliation: Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung m.b.H., Berlin, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Vollmer
authors.forename: O D
authors.initials: OD
authors.lastname: Jurchescu
authors.forename: I
authors.initials: I
authors.lastname: Arfaoui
authors.forename: I
authors.initials: I
authors.lastname: Salzmann
authors.forename: T T M
authors.initials: TT
authors.lastname: Palstra
authors.forename: P
authors.initials: P
authors.lastname: Rudolf
authors.forename: J
authors.initials: J
authors.lastname: Niemax
authors.forename: J
authors.initials: J
authors.lastname: Pflaum
authors.forename: J P
authors.initials: JP
authors.lastname: Rabe
authors.forename: N
authors.initials: N
authors.lastname: Koch
mesh_terms: D004563:Electrochemistry / Q000379:methods*; D008422:Materials Testing / Q000379:methods; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D012666:Semiconductors; D013056:Spectrophotometry, Ultraviolet
chemical_list: D009930:Organic Chemicals; D010100:Oxygen