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

Published

January 25, 2017

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

Pub Type

Journals

Download Paper

https://doi.org/10.1021/acs.jpcc.6b12382

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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 October 22, 2025)