Thermal aging effect of vanadyl acetylacetonate precursor for deposition of VO2 thin films with thermochromic properties

摘要

Thermochromic properties of vanadium dioxide (VO2) have been studied extensively due to their IR reflection applications in energy smart windows. In this paper, we studied the optical switching property of VO2 thin film, depending on the thermal aging time of the vanadyl acetylacetonate (VO(acac)(2)) precursor. We found the alteration of the IR spectra of the precursor by tuning the aging time as well as heat treatments of the precursor. An aging effect of vanadium precursor directly affects the morphologies, optical switching property and crystallinity of VO2 films. The optimum condition was achieved at the 7 day aging time with metal insulator transition (MIT) efficiency of 50%. (C) 2016 Elsevier Ltd. All rights reserved.