报告人：Hiroyuki YOSHIDA教授（日本千叶大学）

报告题目：Conduction Band Structure and Electron Conduction in Organic Semiconductors

报告时间：2025年10月28日上午9:30-10:30

报告地点：909-B厅

报告摘要：

The energy band structure (the energy-momentum dispersion relation) provides crucial information on charge transport in organic semiconductors, such as transfer integrals and electron-phonon coupling. Whereas the experimental observation of the valence band (HOMO) structure has been reported since the 1990s, the conduction band (LUMO) has yet to be experimentally observed. Recently, we have developed angle-resolved low-energy inverse photoelectron spectroscopy (ARLEIPS) [1]. We apply ARLEIPS to the crystalline pentacene film, a prototypical high-mobility organic semiconductor, to successfully observe the conduction band structure of organic semiconductors for the first time [2]. Based on the experimentally obtained conduction band structure, we will discuss the electron transport mechanism in organic semiconductors.

[1] Kashimoto, Y.; Ideta, S.; Sato, H.; Orio, H.; Kawamura, K.;, Yoshida, H. Rev. Sci. Instrum., 94, 063903 (2023). Selected as Editor’s Pick

[2] Sato, H.; Abd. Rahman, S. A.; Yamada, Y.; Ishii, H.; Yoshida, H. Nature Mat. 21, 910 (2022).

个人简介 ：

Hiroyuki Yoshida is a professor at Chiba University, Japan (2015-present). He received his Ph.D. in 1995 from the University of Tokyo and joined the Laboratoire Aimé Cotton, CNRS in France. He served as a research associate (1996-2007) and assistant professor (2007-2015) at the Institute of Chemical Research at Kyoto University. Additionally, he was a researcher in the Japan Science and Technology Agency's PRESTO program (2009-2013). His research interests encompass both occupied and unoccupied electronic states of organic semiconductors and halide perovskites. Particularly noteworthy is his recent development of low-energy inverse photoelectron spectroscopy, recognized as a standard method for investigating unoccupied states and is now used worldwide. In recognition of this achievement, he was awarded the 12th Publication Award by M&BE, Japanese Society of Applied Physics, and the 8th Outstanding Achievement Award by the Organic EL Forum.

联系人：唐建新 教授