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On the coupled ferroelectric‐electrochromic effect of ε‐WO3 |
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| Authors: | Owen O Abe Gagan Jodhani Perena Gouma |
| Affiliation: | 1. Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio;2. Department of Materials Science and Chemical Engineering, SUNY Stony Brook, Stony Brook, New York;3. Department of Materials Science and Engineering, University of Texas, Arlington, Arlington, Texas;4. Institute for Predictive Performance Methodologies, University of Texas Arlington Research Institute, Fort Worth, Texas |
| Abstract: | A reversible electrochromic effect has been observed for the first time in flame spray pyrolysis (FSP) processed ε‐WO3 thin films without the use of an ion storage layer and an electrolytic layer. The dark coloration that appears upon the application of a voltage in films deposited on top of interdigitated gold electrodes is localized to the low voltage (?) electrode arm and it switches to the opposite arm upon a reversal of the polarity. Raman spectroscopy indicated that the coloration was not due to intercalation. It is argued here that the coloration is driven by the asymmetric ferroelectric properties of the ε‐WO3 crystals and that this electrochromic reversibility is intrinsically coupled with the polarization switching of the device. |
| Keywords: | electroceramics ferroelectricity/ferroelectric materials optical materials/properties sensors spray pyrolysis |
