Tunable conductivity and conduction mechanism in an ultraviolet light activated electronic conductor

Mariana Bertoni, Thomas O. Mason, Julia E. Medvedeva, Arthur J. Freeman, Kenneth R. Poeppelmeier, Bernard Delley

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A tunable conductivity has been achieved by controllable substitution of an ultraviolet light activated electronic conductor. The transparent conducting oxide system H-doped Ca12-x Mgx Al14 O33 (x=0,0.1,0.3,0.5,0.8,1.0) presents a conductivity that is strongly dependent on the substitution level and temperature. Four-point dc-conductivity decreases with x from 0.26 Scm (x=0) to 0.106 Scm (x=1) at room temperature. At each composition the conductivity increases (reversibly with temperature) until a decomposition temperature is reached; above this value, the conductivity drops dramatically due to hydrogen recombination and loss. The observed conductivity behavior is consistent with the predictions of our first principles density functional calculations for the Mg-substituted system with x=0, 1, and 2. The Seebeck coefficient is essentially composition and temperature independent, the later suggesting the existence of an activated mobility associated with small polaron conduction. The optical gap measured remains constant near 2.6 eV while transparency increases with the substitution level, concomitant with a decrease in carrier content.

Original languageEnglish (US)
Article number103713
JournalJournal of Applied Physics
Volume97
Issue number10
DOIs
StatePublished - May 15 2005
Externally publishedYes

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ultraviolet radiation
conductors
conduction
conductivity
electronics
substitutes
hydrogen recombinations
temperature
Seebeck effect
decomposition
oxides
room temperature
predictions

ASJC Scopus subject areas

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

Cite this

Bertoni, M., Mason, T. O., Medvedeva, J. E., Freeman, A. J., Poeppelmeier, K. R., & Delley, B. (2005). Tunable conductivity and conduction mechanism in an ultraviolet light activated electronic conductor. Journal of Applied Physics, 97(10), [103713]. https://doi.org/10.1063/1.1899246

Tunable conductivity and conduction mechanism in an ultraviolet light activated electronic conductor. / Bertoni, Mariana; Mason, Thomas O.; Medvedeva, Julia E.; Freeman, Arthur J.; Poeppelmeier, Kenneth R.; Delley, Bernard.

In: Journal of Applied Physics, Vol. 97, No. 10, 103713, 15.05.2005.

Research output: Contribution to journalArticle

Bertoni, Mariana ; Mason, Thomas O. ; Medvedeva, Julia E. ; Freeman, Arthur J. ; Poeppelmeier, Kenneth R. ; Delley, Bernard. / Tunable conductivity and conduction mechanism in an ultraviolet light activated electronic conductor. In: Journal of Applied Physics. 2005 ; Vol. 97, No. 10.
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