Averaging of the electron effective mass in multicomponent transparent conducting oxidesJ. E. Medvedeva
Department of Physics, University of Missouri-Rolla - Rolla, MO 65409, USA
received 16 January 2007; accepted in final form 23 April 2007; published June 2007
published online 21 May 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.
71.20.-b - Electron density of states and band structure of crystalline solids.
© Europhysics Letters Association 2007