关于举行美国堪萨斯大学Wai-Lun Chan教授学术报告的通知
报告题目： Probing Electron Motions in the Nanometer Scale
报告人： Prof. Wai-Lun Chan（ University of Kansas)
报告时间：2016年7月5日（周二）上午9:30
报告地点：北区光电国重 502会议室
欢迎广大师生踊跃参加。
报 告摘要：
Typically, electrons can move a few nanometers within 10s of femtoseconds. With the rapid development of nano-technologies, an atomistic picture on how electrons move within this ultrafast time scale becomes increasingly important. In this talk, a few recent studies will be used to illustrate how new understandings on these electronic processes can impact technological applications such as next generation solar cells. First, the dynamics of localization of excitons and charge transfer excitons in organic semiconductors will be discussed. Our techniques allow us to observe how an optically excited exciton collapses spatially and energetically through electron-vibrational interactions.1 In a second example, we study the electron transfer at a hybrid interface formed by graphene and organic semiconducting molecules. It will be demonstrated that the number of layers and stacking of graphene can be used to control the charge transfer dynamics.2 In a third example, the role of a multi-exciton state in a process called singlet fission will be discussed.3
J. Phys. Chem. Lett. 5, 1812 (2014); Phys. Rev. B 91, 041201R (2015); J. Phys. Chem. C 210, 7491 (2016).
Phys. Rev. Applied 4, 014016 (2015).
Science 334, 1541 (2011); Nature Chem. 4, 840 (2012); J. Am. Chem. Soc. 134, 18295 (2012).
报 告人简介：
Dr. Chan obtained his B. Sc. degree from the Chinese University of Hong Kong in 2001. He obtained both his M. S. and Ph. D. degree in materials science from Brown University in 2003 and 2007 respectively. He was a postdoc researcher at University of Illinois, Urbana-Champaign (2007-2009) and then at University of Texas at Austin (2009-2012). In 2013, he became an Assistant Professor in the department of Physics and Astronomy at the University of Kansas. He has published more than 40 articles in peer-reviewed journals including Science, Nature Materials, Nature Chemistry, Physical Review Letters, Journal of the American Chemical Society, and Account of Chemical Research. His current research interests focus on studying ultrafast electronic processes in materials such as organic semiconductors, 2-dimensional crystals, and nano-materials for new generation energy applications. He obtained awards such as the NSF CAREER award (2014), First Award from Kansas EPSCoR (2013), and Graduate Student Silver Award from the Materials Research Society (2006).
