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 language | English (US) |
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Article number | 113704 |
Journal | Journal of Applied Physics |
Volume | 102 |
Issue number | 11 |
DOIs | |
State | Published - 2007 |
Funding
This work was supported by the MRSEC program of the National Science Foundation at Northwestern University (DMR-0076097), by the Department of Energy (DE-FG02-88ER45372), and by the University of Missouri Research Board.
ASJC Scopus subject areas
- General Physics and Astronomy