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Sputtered SrxNbO3 as a UV transparent conducting film.

Expanding the application space of transparent electrodes towards the ultraviolet range has been found challenging when utilizing the conventional approach to degenerately dope semiconductors with band gaps larger than ZnO or In2O3. Here it is shown that the correlated metal SrxNbO3 with x<1 is ideally suited as a UV transparent electrode material, enabling UV light-emitting diodes for a wide range of applications from water disinfection to polymer curing. It is demonstrated that SrxNbO3 thin films can be grown by RF sputtering and that they remain in the perovskite phase despite a sizeable Sr deficiency. Electrical and optical properties are characterized and compared to commonly used ITO and Sn-doped Ga2O3 transparent conductor standards. SrxNbO3 films were found to have sheet resistances as low as 30 Ohm/sq. with optical transmission at a wavelength of 280 nm up to 86%, marking a two order of magnitude increase over the performance of traditional UV transparent conductors.The compatibility of SrxNbO3 with a physical vapor deposition technique that is widely employed in the transparent conductor coating industry along with the robustness of the highly electrically conducting and optically transparent perovskite phase makes it an ideal transparent electrode for applications in the UV spectrum.