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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Electron transport properties of undoped SnO2 monocrystals

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Lanfredi, Alexandre J. C. [1] ; Geraldes, Renan R. [2] ; Berengue, Olivia M. [2] ; Leite, Edson R. [3] ; Chiquito, Adenilson J. [2]
Total Authors: 5
[1] Univ Fed ABC, Ctr Engn Modelagem Ciencias Sociais Aplicadas, BR-09210170 Sao Paulo - Brazil
[2] Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Paulo - Brazil
[3] Univ Fed Sao Carlos, Lab Interdisciplinar Eletroquim & Ceram, Dept Quim, BR-13565905 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Applied Physics; v. 105, n. 2 2009.
Field of knowledge: Engineering - Materials and Metallurgical Engineering
Web of Science Citations: 21

Using low-resistance indium contacts, we measured some transport properties of undoped vapor-liquid-solid grown tin oxide monocrystals with a belt shape. From the transport measurements, the two following conduction mechanisms were investigated: thermal activation and variable range hopping. An energy gap of 3.8 eV was found. The energy gap was confirmed by thermally activated measurements in the range between 10 and 300 K. For high temperatures (T>300 K), the influence of the disorder caused by the superficial ions layer is measurable. The electron transport in this case was found to be governed by the well known variable range hopping mechanism and the spatial extension of carrier's wavelength was calculated to be 4 nm. (AU)