Growth and physical properties of Ba_1-xLa_xSnO₃films grown on SrTiO₃substrates by sol-gel method

Abstract

Perovskite-structured Ba 1-x La x SnO 3 (x=0.04, 0.06, 0.08) (BLSO) films were epitaxially grown on SrTiO 3 (001) substrates by a sol-gel method. The microstructure and surface of the films were analyzed by X-ray diffraction and atomic force microscopy, respectively. The results show that the films exhibit preferred orientation along the c-axis without cracks or voids. Optical properties were studied in a wide photon energy range between 1.1 and 5.9 eV by spectroscopic ellipsometry. It was found that the optical band gap of the BLSO films increases gradually from 3.42 to 3.73 eV with increasing La concentration.