title: Undoped InOx films deposited by radio frequency plasma enhanced reactive thermal evaporation at room temperature: importance of substrate.
abstract: Conductive and transparent undoped thin films of indium oxide (InOx ), 120 nm average thick, were deposited by radio frequency plasma enhanced reactive thermal evaporation (rf-PERTE) of indium in the presence of oxygen at room temperature. Several substrates were used in order to study their influence on the main properties of these films: alkali free (AF) glass, fused silica, crystalline silicon and polyethylene terephthalate (PET). Surface morphology of the InOx films as a function of the substrates was observed by SEM and showed that the undoped InOx films obtained are nanostructured. For the c-Si substrate, InOx films with increased grain size are obtained, induced by the crystalline substrate. Films deposited on fused silica and AF glass substrates show a nano-grainy surface with similar surface morphologies. The InOx films deposited on AF glass show the highest values of both: electrical conductivity of about 1100 (omega cm)(-1) and visible transmittance of 85%. The substrate has a greater influence on the surface morphology of the films when a polymer (PET) is used. InOx films deposited on PET show a decrease in the electrical conductivity (90 (omega cm)(-1)) and a slight decrease in the average visible transmittance (78%).
authors.affiliation: Dept. de Ciência dos Materiais, FCT-UNL, Quinta da Torre, 2829-516 Caparica, Portugal.
authors.forename: P
authors.initials: P
authors.lastname: Parreira
authors.forename: G
authors.initials: G
authors.lastname: Lavareda
authors.forename: J
authors.initials: J
authors.lastname: Valente
authors.forename: F T
authors.initials: FT
authors.lastname: Nunes
authors.forename: A
authors.initials: A
authors.lastname: Amaral
authors.forename: C Nunes
authors.initials: CN
authors.lastname: de Carvalho