研究・研究者
研究会・セミナー
| 演 題 | 「Doping of Molecular Monolayers: The Impact of Potassium Atoms」 |
|---|---|
| 日 時 | 2018年09月27日(木) 16:00 |
| 講演者 | Prof. Torsten Fritz （Institute of Solid State Physics, Friedrich Schiller Universität Jena） |
| 場 所 | 分子科学研究所 研究棟201号室 |
| 概 要 | Alkali metal atoms are frequently used for simple yet efficient n-type doping of organic semiconductors. However, the incorporation of dopants from the gas phase into molecular crystal structures needs to be controlled and well understood in order to optimize the electronic properties (charge carrier density and mobility) of the target material. Here, we report that potassium intercalation into the pristine 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) monolayer domains on a Ag(111) substrate induces distinct stoichiometry-dependent structural reordering processes, resulting in highly ordered and large KxPTCDA domains [1]. The emerging structures are analyzed by low-temperature scanning tunneling microscopy, scanning tunneling (hydrogen) microscopy (ST[H]M), and low-energy electron diffraction as a function of the stoichiometry. The doped thin films have been further characterized by PES, x-ray standing wave (XSW), and differential reflectance spectroscopy (DRS) [2]. All experimental results are consistently interpreted with the help of density functional theory (DFT) calculations [1,2].
[1] C. Zwick et al., ACS Nano 2016, 10, 2365−2374. |
| その他 | This seminar is co-hosted with the JSPS invitational fellowship program. |
| お問合せ先 |
所内対応者：解良 聡（光分子科学第三） |
