Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Poster Wednesday: Organic Molecules at Surfaces 2
O 55.2: Poster
Mittwoch, 7. September 2022, 18:00–20:00, P4
The investigation of self-assembly molecule on metal substrate — •Yong-He Pan and GERMAR Hoffmann — Department of Physics, National Tsing Hua University
Field-effect transistors (FETs) made out of organic materials are lighter, mechanically more flexible, have lower costs and have higher field-effect mobility. For picene-(C14H29)2 the highest field-effect mobility in all FETs was recorded. Here, phenacene-(C14H29)2 is deposited on Au(111) by thermal evaporation and is investigated by STM and Scanning Tunneling Spectroscopy (STS) at 70 K under UHV conditions. The self-assembly molecule forms a rhombohedral unit cell with a two molecular basis, and the alkyl chain, flexible up to 15 degrees, is nearly parallel with the nearby molecules. Scanning close to the bandgap region of the phenacene(C14H29)2 leads to imaging of the LUMO-state, which also shows the pronounced electronic state on the phenacene core and energetically broad state on the alkyl chain.