Indium tin oxide (ITO) is one of the most used conductive transparent oxide (CTO). Its electrical and optical properties under different environments are crucial to several applications. In this study, single-mode, broadband, integrated optical waveguide (IOW) technique was used to investigate the spectroscopic properties of ultra-thin (~ 13 nm) ITO films under electrical potential modulation. Optical absorbance changes under cyclic voltammetry at various probing wavelengths were measured. Electric potential for minimum absorbance against wavelength was analyzed, and we observed a clear linear correlation between them. Understanding the mechanisms behind this unusual spectroscopic change under potential modulation may have an important impact on several technological applications of ITO.

Date Published: 27 September 2012
PDF: 6 pages
Proc. SPIE 8459, Physical Chemistry of Interfaces and Nanomaterials XI, 845911 (27 September 2012); doi: 10.1117/12.2000142

Published in SPIE Proceedings Vol. 8459:
Physical Chemistry of Interfaces and Nanomaterials XI
Jenny Clark; Carlos Silva, Editor(s)