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The Control of Transition Behavior of VO 2 Film Deposited on Sapphire (0001) Substrate by the Organic Polymer‐Assisted Thermal Deposition
Author(s) -
Lee Myeongsoon,
Kim Don
Publication year - 2018
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.11388
Subject(s) - polyvinylpyrrolidone , impurity , materials science , monoclinic crystal system , analytical chemistry (journal) , substrate (aquarium) , phase (matter) , sapphire , diffractometer , deposition (geology) , chemical engineering , thermal stability , transmittance , chemistry , crystallography , polymer chemistry , organic chemistry , crystal structure , composite material , optics , scanning electron microscope , laser , oceanography , engineering , biology , paleontology , physics , optoelectronics , sediment , geology
We present the effects of organic additives (sucrose, polyvinylalcohol [PVA], and polyvinylpyrrolidone [PVP]) on a precursor solution (VO 2+ ion) to the physicochemical properties of the thermally deposited VO 2 film on sapphire (0001) plane. All the VO 2 films, which deposited with assistance of the organic chemicals, showed a sudden change in resistance measurement near 340 K, but the sudden change did not appear in the film which deposited without the organic additives. The X‐ray diffractometer patterns of the films show monoclinic type VO 2 ( M ‐VO 2 ) as main phase, which has preferred growing axis (020) and (−211), and V 2 O 5 as impurity phase. The intensity of the impurity peaks was minimized in PVP‐assisted deposition and showed the best performance as a smart window, ~10% transmittance gap between low and high temperature phases at 1550 nm. The atomic ratio of oxygen/carbon in the organic additives (1:1 in sucrose –[CH 2 O] n –, 1:2 in PVA –[C 2 H 4 O] n –, and 1:6 in PVP –[C 6 H 9 NO] n –) seems an important condition to determine the performance of the smart window.