Publication date: 15 September 2018
Source:Journal of Crystal Growth, Volume 498
Author(s): M. Becker, F. Michel, A. Polity, P.J. Klar
SnOx films were fabricated on soda-lime glass and sapphire substrates by reactive ion beam sputter deposition (IBSD). A detailed growth series on c -plane sapphire was prepared using heater temperatures from room temperature to C with different oxygen-to-argon ratios to investigate the impact of those parameters on thin film characteristics. By applying X-ray diffraction analysis and Raman spectroscopy an operating window was defined, in which SnO was grown without inclusions of parasitic Sn-related phases. The chemical bonding of the films was examined by X-ray photoelectron spectroscopy (XPS). Only a very narrow regime of oxygen flux was found with a composition close to stoichiometry. Furthermore, variation of the composition in as well as the growth temperature were found to influence the morphology of the grown layer. The surface morphology was investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). An average grain size of –50 nm was revealed for films grown at C, which increases for annealed samples and samples grown at elevated temperatures. In addition to the expected influence on grain growth and surface roughness, disintegration of the SnO crystallites was found for inappropriate oxygen flux and heater temperature, giving way to incorporation of Sn or SnO2 species.
Source:Journal of Crystal Growth, Volume 498
Author(s): M. Becker, F. Michel, A. Polity, P.J. Klar
