Volume 78, Number 5, June 2007
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 May 2007|
Averaging of the electron effective mass in multicomponent transparent conducting oxides
Department of Physics, University of Missouri-Rolla - Rolla, MO 65409, USA
Accepted: 23 April 2007
We find that layered materials composed of various oxides of cations with s2 electronic configuration, O4, or Sc, , Zn, Al, Cd and/or Mg, exhibit isotropic electron effective mass which can be obtained via averaging over those of the corresponding single-cation oxide constituents. This effect is due to a hybrid nature of the conduction band formed from the s-states of all cations and the oxygen p-states. Moreover, the observed insensitivity of the electron effective mass to the oxygen coordination and to the distortions in the cation-oxygen chains suggests that a similar behavior can be expected in the technologically important amorphous state. These findings significantly broaden the range of materials as efficient transparent conductor hosts.
PACS: 71.20.-b – Electron density of states and band structure of crystalline solids
© Europhysics Letters Association, 2007
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