Enhanced electronic conductivity in Si-substituted calcium aluminate

Mariana I. Bertoni, Thomas O. Mason, Julia E. Medvedeva, Yongqiang Wang, Arthur J. Freeman, Kenneth R. Poeppelmeier

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Abstract

Improved conductivity has been achieved by controllable substitution of an ultraviolet electronic conductor. The transparent conducting oxide system, H-doped Ca12 Al (14-x) Six O (33+ x/2) with x=0-4, exhibits a conductivity strongly dependent on the substitution level. Four-point direct current conductivity increases with x from 0.15 to 0.61 S/cm at room temperature. The observed conductivity behavior is consistent with the predictions of our first principles density functional calculations for the Si-substituted system with x=0, 2, and 4. Furthermore, the Seebeck coefficient is composition dependent suggesting the existence of an activated mobility associated with small polaron conduction.

Original languageEnglish
Article number113704
JournalJournal of Applied Physics
Volume102
Issue number11
DOIs
Publication statusPublished - Dec 20 2007

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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