Stable Correlated 4d(2) SrMoO3 Films Epitaxially Coated on Al2O3 for Electromagnetic Shielding and Transparent Conductors

Correlated perovskites have attracted significant attention worldwide for their potential application in transparent conductors. However, most studies in this area have focused on single-crystalline films grown on expensive perovskites. In this study, the transparent conducting properties of SrMoO3 epitaxial films grown on Al2O3, the most commonly used substrate for optoelectronics, are investigated. The 45-80-nm-thick SrMoO3 epitaxial films on (11 over bar 02)${\bf (}1\bar{1}02{\bf )}$-oriented Al2O3 exhibit low sheet resistance (< 50 omega (-1)) at room temperature and high ultraviolet-visible transmittances (> 60%), comparable with the values expected from single-crystalline films. The highly conductive properties induced by two electrons in the outermost 4d orbitals guarantee a high electromagnetic shielding effectiveness of approximately 28.5 dB at 10 GHz in the X-band. The SrMoO3 films are thermally stable below 450 degrees C in air and 700 degrees C in vacuum. Taken together, these results indicate that SrMoO3 epitaxial films grown on (11 over bar 02)\[{\bf (}1\bar{1}02{\bf )}\]Al2O3 can be highly promising for optoelectronic applications in extreme environments.