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Title: Structural and physical properties of transparent conducting, amorphous Zn-doped SnO{sub 2} films

The structural and physical properties of conducting amorphous Zn-doped SnO{sub 2} (a-ZTO) films, prepared by pulsed laser deposition, were investigated as functions of oxygen deposition pressure (pO{sub 2}), composition, and thermal annealing. X-ray scattering and X-ray absorption spectroscopy measurements reveal that at higher pO{sub 2}, the a-ZTO films are highly transparent and have a structural framework similar to that found in crystalline (c-), rutile SnO{sub 2} in which the Sn{sup 4+} ion is octahedrally coordinated by 6 O{sup 2−} ions. The Sn{sup 4+} ion in these films however has a coordination number (CN) smaller by 2%–3% than that in c-SnO{sub 2}, indicating the presence of oxygen vacancies, which are the likely source of charge carriers. At lower pO{sub 2}, the a-ZTO films show a brownish tint and contain some 4-fold coordinated Sn{sup 2+} ions. Under no circumstances is the CN around the Zn{sup 2+} ion larger than 4, and the Zn-O bond is shorter than the Sn-O bond by 0.07 Å. The addition of Zn has no impact on the electroneutrality but improves significantly the thermal stability of the films. Structural changes due to pO{sub 2}, composition, and thermal annealing account well for the changes in the physical properties of a-ZTOmore » films.« less
Authors:
; ; ; ;  [1] ;  [2]
  1. Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208 (United States)
  2. DND-CAT, Northwestern Synchrotron Research Center at Advanced Photon Source, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
22275698
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; ANNEALING; CHARGE CARRIERS; COORDINATION NUMBER; DOPED MATERIALS; ENERGY BEAM DEPOSITION; LASER RADIATION; OXYGEN; PHASE STABILITY; PULSED IRRADIATION; THIN FILMS; TIN IONS; TIN OXIDES; VACANCIES; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY; ZINC IONS