Prof Nobuo UENO（上野信雄教授）：The nature of organic semiconductors: Universal origin of their peculiar electronic/electrical properties
发布日期：2016-04-25 点击量：
| The nature of organic semiconductors: Universal origin of their peculiar electronic/electrical properties
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| Prof Nobuo UENO（上野信雄教授）
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| Chiba University, Japan
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| 郝晓涛 教授
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| 2013-10-24 15:45
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| 知新楼C702量子报告厅
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| Charge carrier transport, which is central to the performance of organic-based devices, was shown to be strongly affected by localized electronic gap states originating from structural imperfections, impurities and/or chemical interactions with the gaseous environment. Detailed investigations of gap states energy distribution are therefore of paramount importance to understand the energy level alignment at interfaces and the intrinsic limits of transport in organic semiconductors. We use ultrahigh-sensitivity ultraviolet photoelectron spectroscopy (UPS), which was developed at Chiba University, to demonstrate that even exposure to seemingly innocuous inert gases such as N2 and Ar can have a significant impact on the electronic properties of pentacene films.
In this talk we will introduce our recent innovative studies on low density-of-states in the band gap, which are induced by weak physical perturbations, using ultrahigh-sensitivity UPS. The results are of fundamental importance for a better understanding of the nature of organic semiconductors, but are also of high practical importance, given that current processing steps in organic electronics always include exposure to inert, e.g. N2, atmosphere. If time is available, we will also discuss other topics in relation to the nature of organic semiconductors, namely band dispersion, electron-phonon coupling for the study of charge mobility.
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| Academic positions：
1996-present, Full Professor of Chiba University
1989-1996, Associate Professor, Chiba University
1977-1988, Research Asociate, Lecturer, Chiba University
1984-1985 Research fellow of Alexander von Humboldt Foundation at HASYLAB, DESY, Hamburg, West Germany (Prof. E. E. Koch)
1976-1977, Post doctoral fellow of Japan Society for the Promotion of Science (JSPS) at Dept. of Applied Physics, Tohoku University (Prof. S. Kiyono)
2009-2012, Special assistant to the president of Chiba University
2009-present, Director of Advanced Institute for Molecular Electronics Studies, Chiba University
Program leader (representative of Chiba University)
2003-2007，Leader of 21st Century Center-of-Excellence program (MEXT), “Frontiers of Super-Functionality Organic Devices”
2008-2012，Leader of Global Center-of-Excellence program (MEXT), “Advanced School of Organic Electronics”
2013，Leader of 卓越した大学院拠点形成(MEXT)
1976，PhD， Tohoku University
1973，Master，Tohoku University
1971，Bachelor，Shinshu University
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