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Surface Structure of Organic Semiconductor [ n]Phenacene Single Crystals
Yusuke Wakabayashi1, Masanari Nakamura1, Kaori Sasaki1
1Division of Materials Physics, Graduate School of Engineering Science , Osaka University , Toyonaka 560-8531 , Japan.
Abstract:
Surface structure relaxation of organic semiconductors affects the properties of organic devices, although such relaxation has not been well explored. Only two examples have been experimentally reported; tetracene shows a large surface relaxation, while rubrene exhibits no relaxation. Therefore, a systematic investigation of the surface relaxation is conducted on [ n]phenacenes ( n = 5, 7, and 9). Electron density analyses are performed based on the synchrotron surface X-ray scattering with the aid of first-principles calculations. The results show little surface relaxation in [ n]phenacenes.
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