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Static and Time-Resolved Terahertz Measurements of Photoconductivity in Solution-Deposited Ruthenium Oxide Nanofilms



Brian G. Alberding, Paul A. Desario, Adam D. Dunkelberger, Debra R. Rolison, Jeffrey C. Owrutsky, Edwin J. Heilweil


Thin film Ruthenium Oxide (RuO2) is a promising alternative material as a conductive electrode in electronic applications because its rutile crystalline form is metallic and highly conductive. Herein, a previously established solution-deposition multi-layer technique is employed to fabricate ca. 55 nm thick films (nanoskins) and terahertz spectroscopy used to determine their photoconductive properties. Upon calcining at temperatures ranging from 373 K to 773 K, nanoskins undergo a transformation from insulating/semiconductor type behavior to metallic behavior. Terahertz time-domain spectroscopy (THz-TDS) indicates that the nanoskins attain maximum static conductivity when calcined at 673 K. Picosecond time-resolved Terahertz spectroscopy (TRTS) using 400 nm and 800 nm excitation reveals a transition to metallic behavior when calcined at 523 K. For calcine temperatures less than 523 K, the conductivity increases following photoexcitation (del(E) 0) following photoexcitation.
Applied Physics


ruthenium oxide, conductivity, metallic, terahertz spectroscopy, optical properties
Created January 25, 2017, Updated November 10, 2018