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Spontaneous buildup of surface potential with a thin film of a zwitterionic molecule giving noncentrosymmetric crystal structure

Appl. Phys. Lett. 95, 182901 (2009); doi:10.1063/1.3254217

Published 3 November 2009

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Jun'ya Tsutsumi,1 Hiroyuki Yoshida,1 Richard Murdey,2 and Naoki Sato1
1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
2Pioneering Research Unit for Next Generation, Kyoto University, Uji, Kyoto 611-0011, Japan
Surface potentials were examined using the Kelvin method for thin films of zwitterionic molecules, pyridinium 1,3-dihydro-1,3-dioxo-2H-inden-2-ylide (PI or IPB) and two nitrogen-substituted derivatives. Spontaneous buildup of the surface potential on the film (5.5 V at a film thickness of 300 nm) was only observed for the compound with unidirectional orientation of the molecular dipole moments in the single crystal. The relationship between the alignment of the molecular dipole moments in the film and the measured surface potentials was investigated using grazing incidence x-ray diffraction, pole-figure measurements, atomic force microscopy, and Kelvin probe force microscopy. ©2009 American Institute of Physics
History: Received 10 June 2009; accepted 5 October 2009; published 3 November 2009
Permalink: http://link.aip.org/link/?APPLAB/95/182901/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.55.-a
    Thin film structure and morphology
  • 68.35.bm
    Surface structure of polymers and organic materials
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
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