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Shimoyama, Iwao; Baba, Yuji; Hirao, Norie*
Advances in Engineering (Internet), 1 Pages, 2018/02
The performance of organic devices largely depends on molecular orientation in organic films. Whereas micro-orientation control of organic molecules is an indispensable technology for integration of organic devices, the method has not been established. We attempted to control micro-orientation of polydimethylsilane (PDMS) thin films by deposition of PDMS on graphite substrates modified by hetero atom doping using ion beam. Polarization dependence measurements of X-ray absorption spectroscopy and molecular orbital calculations clarified that PDMS films have lying, standing, and random orientations on the non irradiated, N-irradiated, and Ar
-irradiated graphite surfaces, respectively. Furthermore, photoemission microscopy observation clarified that a PDMS film showed micro-patterns on a graphite surface with a microstructure on the order of
m by separating N
-irradiated and non irradiated areas. These results demonstrate our method is promising for micro-orientation of organic molecules.