Comparison of thin film and bulk forms of the transparent conducting oxide solution Cd1+xIn2-2xSnxO4

D. R. Kammler, Thomas O Mason, D. L. Young, T. J. Coutts, D. Ko, Kenneth R Poeppelmeier, D. L. Williamson

Research output: Contribution to journalArticle

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Abstract

Physical and structural properties of thin films prepared via rf magnetron sputtering of the transparent conducting oxide spinel Cd1+xIn2-2xSnxO4 are compared to those reported for bulk specimens (prepared via high-temperature solid state reaction at 1175 °C). Optical band gaps measured on thin films of Cd1+xIn2-2xSnxO4 were 3.5, 3.70, and 3.65 eV for x=0.15, 0.45, and 0.70, which where 0.57, 0.94, and 0.95 eV higher than their bulk counterparts. Thin film Seebeck coefficients were -18.0, -15.5, and -15.5 μV/K for x=0.15, 0.45, and 0.70, respectively, which were 27, 24, and 19 μV/K smaller in magnitude than their bulk counterparts. Sn-Mössbauer spectroscopy revealed isomer shifts that averaged 0.2 mm/s for both bulk and thin films specimens. The presence of quadrupole splitting, which averaged near 0.48 mm/s for film specimens and 0.39 mm/s for bulk specimens, suggests that Sn+4 in all specimens is in octahedral coordination. The difference in quadrupole splitting suggests that thin films have a different cation distribution than their bulk counterparts. The effective mass at the base of the conduction band, measured via the method-of-four-coefficients, was found to be 0.25, 0.18, 0.21, and 0.22 me for x equal to 0.15, 0.45, 0.70, and 1.0, respectively. A model that explains the changes in optical gap and thermopower as a result of differences in the fundamental band gap (resulting from a changing cation distribution), conduction band curvature, and carrier density is presented.

Original languageEnglish
Pages (from-to)5979-5985
Number of pages7
JournalJournal of Applied Physics
Volume90
Issue number12
DOIs
Publication statusPublished - Dec 15 2001

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conduction
oxides
thin films
conduction bands
quadrupoles
cations
Seebeck effect
spinel
magnetron sputtering
isomers
physical properties
curvature
solid state
shift
coefficients
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

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Comparison of thin film and bulk forms of the transparent conducting oxide solution Cd1+xIn2-2xSnxO4 . / Kammler, D. R.; Mason, Thomas O; Young, D. L.; Coutts, T. J.; Ko, D.; Poeppelmeier, Kenneth R; Williamson, D. L.

In: Journal of Applied Physics, Vol. 90, No. 12, 15.12.2001, p. 5979-5985.

Research output: Contribution to journalArticle

Kammler, D. R. ; Mason, Thomas O ; Young, D. L. ; Coutts, T. J. ; Ko, D. ; Poeppelmeier, Kenneth R ; Williamson, D. L. / Comparison of thin film and bulk forms of the transparent conducting oxide solution Cd1+xIn2-2xSnxO4 In: Journal of Applied Physics. 2001 ; Vol. 90, No. 12. pp. 5979-5985.
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