Averaging of the electron effective mass in multicomponent transparent conducting oxides

Details Averaging of the electron effective mass in multicomponent transparent conducting oxides Averaging of the electron effective mass in multicomponent transparent conducting oxides

2007-04-11

arxiv.org/abs/0704.1499v2

Physics

Condensed Matter

Materials Science

Figures with higher resolution included

Scientific paper

10.1209/0295-5075/78/57004

We find that layered materials composed of various oxides of cations with $s^2$ electronic configuration, $XY_2$O$_4$, $X$=In or Sc, $Y$=Ga, 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 {\it 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 similar behavior can be expected in technologically important amorphous state. These findings significantly broaden the range of materials as efficient transparent conductor hosts.

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