Strong conductivity enhancement of La-doped BaSnO₃ transparent films on Al₂O₃ with the assistance of templated epitaxy for electromagnetic shielding in extreme environments

Transparent La-doped BaSnO₃ (BLSO) epitaxial films grown on expensive perovskites show promising conductive properties. However, BLSO films on Al₂O₃ have a higher sheet resistance by two orders of magnitude. In this research, the sheet resistance of BLSO films is recovered to that of the single-crystalline level by growing (111)-oriented BLSO epitaxial films on (0001)Al₂O₃ with the assistance of (111)BaZrO₃/MgO template bilayer. Their intriguing transparent conductive properties, including high electromagnetic shielding effectiveness (~ 13.2 dB at 10 GHz) and high stability at 700 °C, will promote stable optoelectronic applications in extreme environments with economic benefits. Graphical Abstract: [Figure not available: see fulltext.].