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Long term stability is the most pressing issue that impedes commercializationof Vanadium Dioxide (VO2) based functional films, which show a gradual loss ofrelative phase transition performance, especially in humid conditions whenserving as smart windows. Here, we investigated the impact of differentinterface on the deterioration process of VO2 films and proposed a novelencapsulation structure for largely extended service life. Hydrophobic andstable hafnium dioxide (HfO2) layers have been incorporated with VO2 films forencapsulated surfaces and cross sections. With modified thickness and structureof HfO2 layers, the degradation process of VO2 can be effectively suppressed.The proposed films can retain stable phase transition performances under highrelative humidity (90%) and temperature (60 Celsius) over 100 days, which isequal to about 16 years in the real environment. Improving the stability of VO2materials is a necessary step towards commercializing production of highperformance films for long term use.

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Towards Commercializing Vanadium Dioxide Films: Investigation of the  Impact of Different Interface on the Deterioration Process for Largely  Extended Service Life