High carrier mobility in transparent Ba1− xLaxSnO3 crystals with a wide band gap

Abstract

We discovered that perovskite (Ba,La)SnO 3 can have excellent carrier mobility even though its band gap is large. The Hall mobility of Ba 0.98La 0.02SnO 3 crystals with the n-type carrier concentration of ∼8-10 × 10 19cm -3 is found to be ∼103 cm 2 V -1 s -1 at room temperature, and the precise measurement of the band gap δ of a BaSnO 3 crystal shows δ = 4.05 eV, which is significantly larger than those of other transparent conductive oxides. The high mobility with a wide band gap indicates that (Ba,La)SnO 3 is a promising candidate for transparent conductor applications and also epitaxial all-perovskite multilayer devices. © 2012 American Institute of Physics.