Large effects of dislocations on high mobility of epitaxial perovskite Ba0.96La0.04SnO3 films

We studied the relationship between the mobility and dislocation density for recently discovered high-mobility Ba0.96La0.04SnO3 thin-films and found that the carrier density and mobility of the film, as high as 4.0 x 10(20) cm(-3) and 70 cm(2) V-1 s(-1), respectively, decreased as the dislocation density increased. We determined the values for dislocation density using transmission electron microscopy and atomic force microscopy after surface etching. We found that the effect of dislocations on the mobility was large, when compared with that for GaN with a similar dislocation density. The importance of dislocation scattering in the perovskite structure is emphasized, especially in a low-carrier-density regime. (C) 2013 AIP Publishing LLC.