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

Published

Author(s)

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

Abstract

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) while higher calcine temperatures yield films composed of crystalline, rutile RuO2 and the conductivity decreases (del(E) > 0) following photoexcitation.
Citation
Applied Physics
Volume
121
Issue
7

Keywords

ruthenium oxide, conductivity, metallic, terahertz spectroscopy, optical properties

Citation

Alberding, B. , Desario, P. , Dunkelberger, A. , Rolison, D. , Owrutsky, J. and Heilweil, E. (2017), Static and Time-Resolved Terahertz Measurements of Photoconductivity in Solution-Deposited Ruthenium Oxide Nanofilms, Applied Physics, [online], https://doi.org/10.1021/acs.jpcc.6b12382, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=921248 (Accessed March 23, 2023)
Created January 24, 2017, Updated October 12, 2021