Polaron transport in TiO{sub 2} thin films

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3493742· OSTI ID:21476558

Yildiz, Abdullah ^[1]; Iacomi, Felicia; Mardare, Diana ^[2]

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1. Department of Physics, Faculty of Science and Arts, Ahi Evran University, 40040 Kirsehir (Turkey)
2. Faculty of Physics, Alexandru Ioan Cuza University, 11 Carol I Blvd., 700506 Iasi (Romania)

Undoped and Fe-doped TiO{sub 2} thin films were obtained by rf-sputtering technique onto heated glass substrates (250 deg. C) covered with indium tin oxide. The temperature dependence of the electrical conductivity was investigated in the temperature range 13-320 K, and it shows that the conduction mechanism in the studied samples is described by small-polaron hopping (SPH) at temperatures higher than half of the Debye temperature ({theta}{sub D}). It was found that the magnitude of the SPH coupling increases by Fe doping in TiO{sub 2} thin films. With decreasing temperature, the conduction behavior transited from SPH conduction to variable-range hopping (VRH) conduction. In the intermediate temperature domain (200 K<T<{theta}{sub D}/2), the VRH conduction was found to be dominant, while a temperature-independent conductivity behavior was observed in the lower temperature range (T<200 K).

• OSTI ID: 21476558
• Journal Information: Journal of Applied Physics, Vol. 108, Issue 8; Other Information: DOI: 10.1063/1.3493742; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COUPLING
DEBYE TEMPERATURE
DEPOSITION
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
GLASS
INDIUM COMPOUNDS
IRON
POLARONS
SPUTTERING
SUBSTRATES
TEMPERATURE DEPENDENCE
THIN FILMS
TIN OXIDES
TITANIUM OXIDES
CHALCOGENIDES
ELECTRICAL PROPERTIES
ELEMENTS
FILMS
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUASI PARTICLES
TIN COMPOUNDS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS