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    Self-polarization in ultrathin Langmuir-Blodgett polymer films

    Year: 2014

    Journal: THIN SOLID FILMS, Vol. 551, p 171-173, 20150722

    Authors: Zhao, X. L.; Tian, B. B.; Liu, B. L.; Wang, J. L.; Han, L.; Sun, J. L.; Meng, X. J.; Chu, J. H.

    Organizations: Chinese Acad Sci, Shanghai Inst Tech Phys, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China

    Ultrathin copolymer films of vinylidene fluoride and trifluoroethylene were deposited on Al-coated polyimide substrates, by the Langmuir-Blodgett method. A top Al electrode was evaporated onto the polymer film, to form an Al/polymer/Al structured infrared detector. The pyroelectric voltage response of the detector under various polarizing processes was characterized. The detector with only one transferred polymer layer exhibited a preferential polarization direction. This was considered to result from the self-polarization of the ultrathin polymer film. It was due to the preferred alignment of the dipoles on the Al substrates. This process can be applied for designing stable fast-response infrared detectors. (C) 2013 Elsevier B. V. All rights reserved.