title: Effect of N2 and H2 plasma treatments on band edge emission of ZnO microrods.
abstract: ZnO microrods were grown by laser assisted flow deposition technique in order to study their luminescence behaviour in the near band edge spectral region. Transmission electron microscopy analysis put in evidence the high crystallinity degree and microrod's compositional homogeneity. Photoluminescence revealed a dominant 3.31 eV emission. The correlation between this emission and the presence of surface states was investigated by performing plasma treatments with hydrogen and nitrogen. The significant modifications in photoluminescence spectra after the plasma treatments suggest a connexion between the 3.31 eV luminescence and the surface related electronic levels.
authors.affiliation: Departmento de Física &I3N, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Joana
authors.initials: J
authors.lastname: Rodrigues
authors.affiliation: Departmento de Física &I3N, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Tiago
authors.initials: T
authors.lastname: Holz
authors.affiliation: Departamento de Ciencia de los Materiales e I. M. y Q. I, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real, Spain.
authors.forename: Rabie Fath
authors.initials: RF
authors.lastname: Allah
authors.affiliation: Departamento de Ciencia de los Materiales e I. M. y Q. I, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Gonzalez
authors.affiliation: Departamento de Ciencia de los Materiales e I. M. y Q. I, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real, Spain.
authors.forename: Teresa
authors.initials: T
authors.lastname: Ben
authors.affiliation: Departmento de Física &I3N, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Maria R
authors.initials: MR
authors.lastname: Correia
authors.affiliation: Departmento de Física &I3N, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Teresa
authors.initials: T
authors.lastname: Monteiro
authors.affiliation: Departmento de Física &I3N, Universidade de Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Florinda M
authors.initials: FM
authors.lastname: Costa