Thermochromic properties of BN/VO2/BN trilayer films with low phase transition temperature and high hysteresis width. (1st May 2023)

• Record Type: Journal Article
• Authors: Bleu, Yannick; Bourquard, Florent; Poulet, Anthony; Misdanitis, Konstantinos; Jamon, Damien; Loir, Anne-Sophie; Garrelie, Florence; Donnet, Christophe
• Is Part Of: Ceramics international. Volume 49(2023)Part A
• Page Start: 13542
• Page End: 13547
• Publication Date: 2023-05-01
• Subjects: BN/VO2/BN trilayer Film -- Phase transition temperature -- Large hysteresis width -- Luminous transmittance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.12.229
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A novel thermochromic BN/VO2 /BN trilayer thin film was deliberately designed and deposited using pulsed laser deposition combined with rapid thermal annealing. The structure, surface morphology, surface roughness, and thermochromic properties of the as-prepared sandwich structure film were analyzed. A BN buffer layer did not significantly reduce the phase transition temperature Tt, but rather played a role in modifying the surface morphology of VO2 thin film. Covering the BN/VO2 bilayer film with a second BN layer greatly reduced Tt with large hysteresis width, and luminous transmittance (Tlum ) was also enhanced, whereas solar modulation efficiency (ΔTsol ) was reduced. In particular, when the thickness of BN was 70 nm, the resulting BN/VO2 /BN trilayer film reached a low Tt value of 36 °C with large hysteresis width (25 °C) and a high Tlum (∼40%), but with a very low ΔTsol . The properties revealed by this first attempt to use BN thin film in the fabrication of VO2 -based multilayer sandwich structures open up a new path for the design of advanced thermochromic heterostructures with tunable functionalities for smart windows and optical storage devices. Graphical abstract: Image 1