伦斯勒理工学院史夙飞教授讲学通知
时间:2015-12-28 11:13:10   阅读:   标签: 材料学院 讲学 伦斯勒理工学院
应我校材料学院徐成彦教授邀请,美国伦斯勒理工学院 (Rensselaer Polytechnic Institute, RPI)化学及生物工程系助理教授史夙飞(Sufei Shi)博士将于20151229~31日在我校进行短期访问讲学。
 
报告题目:Manipulating Strong Light-Matter Interactions in Graphene and 2D Semiconductors
时间:20151230日上午10:00
地点:材料楼522
主讲人:Dr. Sufei Shi
 
报告摘要:We exploit strong light matter interaction in graphene for graphene based optoelectronic devices. We use both scanning photocurrent microscopy and optical pump terahertz (THz) probe spectroscopy to reveal hot carrier behavior in graphene. This hot carrier behavior is crucial to understand the effect of optical excitation on graphene and can potentially lead to efficient solar energy conversion and ultrafast optoelectronic devices. We also exploit the strong light matter interaction in THz regime to make graphene based THz modulator.
   Transitional metal dichalcogenide (TMD) is a new class of 2D semiconductors which become direct bandgap semiconductor at a single layer limit. MX2 exhibits intriguing excitonic physics as well as strong absorption. We combine optical spectroscopy and scanning tunneling microscopy to determine the extraordinarily large exciton binding energy of MoSe2. This giant exciton binding energy presents a challenge for efficient carrier separation in solar cell applications. We demonstrate that, by using MoS2/WS2 heterostructure, we can achieve a type-II band alignment and realize extremely fast carrier separation.
 
主讲人简介:Dr. Sufei Shi is currently an Assistant Professor of the Department of Chemical and Biological Engineering at Rensselaer Polytechnic Institute. Dr. Shi was a Postdoc fellow at the Physics Department of UC Berkeley, working on optical spectroscopy study of two-dimensional (2D) materials. He obtained his Ph.D. degree under the guidance of Prof. Dan Ralph at Cornell Univ. in Jan, 2012. His Ph.D. research was focused on spatially-resolved and time-resolved scanning photocurrent microscopy on graphene based devices, fabrication of metal nano-contact and single electron transistor devices, as well as electrical transport measurement of these devices at ~ 10 mK and high magnetic field. Dr. Shi is currently working on optical spectroscopy of 2D materials, with a particular focus on terahertz (THz) spectroscopy.
发布:段彬彬 |  审核:张弛 |  来源: 材料学院