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Growth parameter-property phase diagram for pulsed laser deposited transparent oxide conductor anatase Nb:TiO2

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6 Author(s)
Zhang, S.X. ; Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA ; Dhar, S. ; Yu, W. ; Xu, H.
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The authors performed a systematic study of the structural and electrical properties of Nb:TiO2 thin films by varying the substrate temperature (TS) and oxygen partial pressure (PO2). Niobium is found to incorporate easily and substitutionally into titanium lattice site as indicated by its low activation energy. By increasing TS, the carrier concentration (n) increases in the same way that niobium substitution fraction (s) increases, and the mobility increases as the structural quality is improved. With increasing PO2, n decreases dramatically though s does not change considerably. This may indicate that a large number of p-type native defects form, which “kill” the electrons produced by the Nb donors.

Published in:

Applied Physics Letters  (Volume:91 ,  Issue: 11 )

Date of Publication:

Sep 2007

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