Topographic and Electronic study of [10]Phenacene molecules with Scanning Tunneling Microscopy / Spectroscopy
Akash Gupta1*, Paul Yu-Hsiang Yen1, Lin Hsuan Ting1, Yong-He Pan1, Hideki Okamoto2, Germar Hoffman1
1Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
2Department of Chemistry, Okayama University, Japan
* Presenter:Akash Gupta,
Organic electronics is the inclusion of semiconducting organic moieties for the design of mechanically flexible and versatile devices. The popular Pentacene, with a linear arrangement of five benzene rings, is intensively studied but degrades under the presence of Oxygen. The chemically more robust [n]Phenacene molecules are planar and consist of n benzene rings, which are fused in a repeating W-shaped pattern. Recent studies on the fabrication and characterization of OFETs have demonstrated excellent FET properties. Thereby, the electron mobility increases with n the number of benzene rings.
Here, we present a systematic study of [10] Phenacene adsorbed on Ag(111) and Au(111). We follow the growth of [10] Phenacene from submonolayer up to 2 ML in terms of structure with STM and electronic properties in STS. The results are discussed along with published and recently obtained new data on pristine and substituted [n]Phenacenes.

Keywords: Scanning Tunneling Microscope , Scanning Tunneling Spectroscopy , Organic molecules