Abstract
Vanadium dioxides (VO2) thermochromic materials could exhibit reversible change in optical transmittance in response to external temperature. However, traditional VO2-based smart window is limited to an insufficient solar modulation ability as well as excessive transition temperature. Herein, we designed an all-solid form of YOxHy/VO2 multilayer film structure on quartz glass substrate, which can separately regulate visible and NIR light transmittance responding to environmental light and temperature, respectively. The hybrid film exhibits transparency under normal condition of room temperature and weak illumination, and solar energy transmittance can be dynamically regulated from 43% to 28%, 16% and finally 14% by controlling the conditions of temperature and illumination. Also, the optical and electrical transition temperature of m-VO2 shows an obvious decline. This hybrid film features high solar modulation ability and great conditional responsiveness with zero-energy consumption and low transition temperature. Our current results would supply new opportunities for smart-window applications, and also provide a new strategy for solar transmittance modulation.
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