Berlin 2018 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.11: Poster

Dienstag, 13. März 2018, 18:15–20:15, Poster B

VO2-SnO2 nanocomposite films for smart windows applications — Alexandr Belenchuk¹, Oleg Shapoval¹, Sergiu Vatavu², Arcadi Chirita², and •Vasily Moshnyaga³ — ¹IIEN, Academy of Sciences, Chisinau, Republic of Moldova — ²Moldovan State University, Republic of Moldova — ³Erstes Physikalisches Institut, Georg-August-Universität Göttingen, Germany

Vanadium dioxide, VO2, is a promising thermochromic material due to a drastic change of the infrared transmittance at the metal-insulator transition. However, a high transition temperature, Tmi=68C, and low transmittance impede industrial applications of VO2-based smart windows. To address these challenges, we employed a nanocomposite approach, which allows one to increase the transmittance and to generate a strain between nanocrystals to reduce Tmi. Nanocomposite VO2-SnO2 thin films were grown by a metalorganic aerosol deposition (MAD) technique on amorphous SiO2 substrates under reduced oxygen conditions. A single solution containing metalorganic precursors of vanadium and tin was used. Atomic-force (AFM) and scanning-electron (SEM) microscopy revealed dense films, composed of homogeneous nanocrystals with irregular shape. X-ray diffraction evidences a V1-xSnxO2 solid solution in spite of huge lattice mismatch between the oxides. A low temperature annealing [1] was used to achieve the VO2/SnO2 phase separation by means of a spinodal decomposition. Financial support from the STCU Project and DFG via SFB 1073 (TP A02) is acknowledged. [1] Zenji Hiroi et al., Chem. Mater. 25, 2202 (2013)