This letter investigates the intrinsic electronic switching time associated with the insulator-to-metal phase transition in epitaxial single crystal vanadium dioxide (VO2) thin films using impedance spectroscopy and ac conductivity measurements. The existence of insulating and metallic phase coexistence, intrinsic to the epitaxial (001) oriented VO2 thin film grown on a (001) rutile TiO2 substrate, results in a finite capacitance being associated with the VO2 films in their insulating phase that limits the electronic switching speed. Insights into the switching characteristics and their correlation to the transport mechanism in the light of phase coexistence are obtained by performing a detailed scaling study on VO2 two-terminal devices.
REFERENCES
1.
R. M.
Bowman
and J. M.
Gregg
, J. Mater. Sci.
9
, 187
(1998
);2.
L. L.
Ladd
and W.
Paul
, Solid State Commun.
7
, 425
(1969
).3.
G.
Stefanovich
, A.
Pergament
, and D.
Stefanovich
, J. Phys. Condens. Matter
12
, 8837
(2000
).4.
K.
Okimura
and J.
Sakai
, Jpn. J. Appl. Phys., Part 2
46
, L813
(2007
).5.
B. G.
Chae
, H. T.
Kim
, D. H.
Youn
, and K. Y.
Kang
, Physica B
369
, 76
(2005
).6.
J. T. S.
Irvine
, D. C.
Sinclair
, and A. R.
West
, Adv. Mater.
2
, 132
(1990
).7.
H.
Paik
, J.
Moyer
, J. A.
Mundy
, J.
Tashman
, D. A.
Muller
, P.
Schiffer
, and D. G.
Schlom
, “Structure and transport property of ultrathin epitaxial VO2 thin film on TiO2 (001) substrate grown by MBE
” (unpublished).8.
J. R.
Macdonald
, Ann. Biomed. Eng.
20
, 289
(1992
).9.
R.
Schmidt
, W.
Eerenstein
, T.
Winiecki
, F. D.
Morrison
, and P. A.
Midgley
, Phys. Rev. B
75
, 245111
(2007
).10.
M. M.
Qazilbash
, M.
Brehm
, B.-G.
Chae
, P. C.
Ho
, G. O.
Andreev
, B.-J.
Kim
, S. J.
Yun
, A. V.
Balatsky
, M. B.
Maple
, F.
Keilmann
, H.-T.
Kim
, and D. N.
Basov
, Science
318
, 1750
(2007
).11.
S.
Zhang
, J. Y.
Chou
, and L. J.
Lauhon
, Nano Lett.
9
, 4527
(2009
).12.
J. F.
Palmier
and Y.
Ballini
, Solid State Commun.
14
, 575
(1974
).13.
A.
Mansingh
, R.
Singh
, and M.
Sayer
, J. Phys. Chem. Solids
45
, 79
(1984
).14.
J. B.
Goodenough
, J. Solid State Chem.
3
, 490
(1971
).© 2013 American Institute of Physics.
2013
American Institute of Physics
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