Mapping of electronic states and time- and space-resolved carrier dynamics of in organic semiconductor films

2014 Fiscal Year Final Research Report

• Project/Area Number: 24656036
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: Osaka University
• Principal Investigator: YAMADA Takashi 大阪大学, 理学(系)研究科(研究院), 助教 (90432468)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 2光子光電子分光 / 有機半導体 / 非占有準位 / 走査トンネル顕微鏡 / ルブレン / フタロシアニン

Outline of Final Research Achievements

On the organic semiconductor films where the size and thickness are well-defined, we tried to measure carrier dynamics in real time with femto second time resolution. As compared to static information (ex. superstructures), dynamic information is important for understanding the mechanism of carrier transport, this leads to the guiding principle for manufacturing the materials for organic electronic devices.
In this study, we tried to measure electronic states as well as superstructures of organic molecules. PEEM (Photo electron emission microscope) was used to observe surface structures in the micrometer scale. Light source of PEEM is pulsed laser, different from discharge lamp used for normal studies. Two-photon excited PEEM enable us to observe 2ML island of rubrene/HOPG, in which photoemission intensity was strongly enhanced due to the intra molecular resonant transition occurred at specific photon energy.

Free Research Field

表面化学