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Stoichiometry and microstructural effects on electrical conduction in pulsed dc sputtered vanadium oxide thin films

Published online by Cambridge University Press:  31 January 2011

Bryan D. Gauntt ,
Elizabeth C. Dickey  and
Mark W. Horn
Bryan D. Gauntt*
Affiliation:
Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802
Elizabeth C. Dickey
Affiliation:
Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802
Mark W. Horn
Affiliation:
Department of Engineering Sciences and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Vanadium oxide thin films were deposited using pulsed direct current (dc) magnetron sputtering in an atmosphere containing argon and oxygen. The total pressure was varied from 2.5 to 15 mTorr, and the oxygen-to-argon ratio was varied from 2.5 to 30%. The resulting films were characterized using Rutherford backscattering spectroscopy (RBS), transmission electron microscopy (TEM), electron energy loss spectroscopy (EELS), and glancing incidence x-ray diffraction (GIXRD). Electrical resistivity was calculated from I–V curves acquired from two-point-probe measurements and thicknesses measured from bright-field TEM images of cross-sectioned samples. TEM and GIXRD were used to characterize the crystallinity of each film. A transition from nanocrystalline to amorphous growth was observed with increasing partial pressure of oxygen. In all samples, the only crystalline phase observed was cubic vanadium oxide with the sodium chloride structure. Though the cubic VOx equilibrium phase field is limited to a maximum of x = 1.3, the cubic phase was observed with a value of x up to 2 in the present work. It was apparent from electron diffraction data that increased oxygen content correlated with an increase in the film disorder. The increase in oxygen content also corresponded with an increase in the film resistivity, which varied over 7 orders of magnitude from 1.18 × 10−3 to 2.98 × 104 Ω·cm. The temperature coefficient of resistance was found to increase with increasing oxygen content from −0.1 to −3.5%/°C. A direct correlation between film disorder and temperature coefficient of resistivity (TCR) was observed and could be exploited to engineer materials with the desired TCR.

Keywords

SputteringTransmission electron microscopy (TEM)V
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 4 , April 2009 , pp. 1590 - 1599
Copyright
Copyright © Materials Research Society 2009

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