title: Zn vacancy induced green luminescence on non-polar surfaces in ZnO nanostructures.
abstract: Although generally ascribed to the presence of defects, an ultimate assignment of the different contributions to the emission spectrum in terms of surface states and deep levels in ZnO nanostructures is still lacking. In this work we unambiguously give first evidence that zinc vacancies at the (1010) nonpolar surfaces are responsible for the green luminescence of ZnO nanostructures. The result is obtained by performing an exhaustive comparison between spatially resolved cathodoluminescence spectroscopy and imaging and ab initio simulations. Our findings are crucial to control undesired recombinations in nanostructured devices.
authors.affiliation: IMEM-CNR Institute, Parco Area delle Scienze 37/A, 43124 Parma (Italy).
authors.forename: F
authors.initials: F
authors.lastname: Fabbri
authors.affiliation: IMEM-CNR Institute, Parco Area delle Scienze 37/A, 43124 Parma (Italy).
authors.forename: M
authors.initials: M
authors.lastname: Villani
authors.affiliation: 1] IMEM-CNR Institute, Parco Area delle Scienze 37/A, 43124 Parma (Italy) [2] CNR-NANO, Istituto Nanoscienze, Centro S3, 41125 Modena, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Catellani
authors.affiliation: CNR-NANO, Istituto Nanoscienze, Centro S3, 41125 Modena, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Calzolari
authors.affiliation: 1] IMEM-CNR Institute, Parco Area delle Scienze 37/A, 43124 Parma (Italy) [2] Dipartimento Scienza Applicata e Tecnologia, Politecnico of Torino, Torino, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Cicero
authors.affiliation: IMEM-CNR Institute, Parco Area delle Scienze 37/A, 43124 Parma (Italy).
authors.forename: D
authors.initials: D
authors.lastname: Calestani
authors.affiliation: Dipartimento di Chimica GIAF, Universita' di Parma, Parco Area delle Scienze 17A, 43100 Parma (Italy).
authors.forename: G
authors.initials: G
authors.lastname: Calestani
authors.affiliation: IMEM-CNR Institute, Parco Area delle Scienze 37/A, 43124 Parma (Italy).
authors.forename: A
authors.initials: A
authors.lastname: Zappettini
authors.affiliation: Nano Device Characterization group, Advanced Electronic Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044 (Japan).
authors.forename: B
authors.initials: B
authors.lastname: Dierre
authors.affiliation: Nano Device Characterization group, Advanced Electronic Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044 (Japan).
authors.forename: T
authors.initials: T
authors.lastname: Sekiguchi
authors.affiliation: IMEM-CNR Institute, Parco Area delle Scienze 37/A, 43124 Parma (Italy).
authors.forename: G
authors.initials: G
authors.lastname: Salviati