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

Tsutsumi, Jun’ya; Yoshida, Hiroyuki; Murdey, Richard; Sato, Naoki
November 2009
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p182901
Academic Journal
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.


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