应物理科学与技术学院秦勇教授邀请，现英国曼彻斯特大学Max Migliorato博士来我校讲学，敬请关注！
报告题目：Beyond ZnO materials for Piezotronics and Nanogeneration
Max A. Migliorato (Laurea in Physics, 1999, University of Rome “La Sapienza”, Italy, and PhD, 2003, University of Sheffield, UK). Since March 2011 he is a Lecturer in the University of Manchester, with research in modelling of electronic materials, the co-chairman of the international conference on Theory, Modelling and Computational methods for Semiconductors (TMCS). He has focused on the study of modelling, simulations and characterization of semiconductor materials and devices for 15 years and his interests span from IIII-As, III-N, SiGe to Graphene. Over the years he has been awarded 3 EPSRC grants and 2 Research Fellowships and authored around 40 journal articles and received around 600 citations. His recent work on Graphene, based on a novel technique of predicting crystal deformation under external strain, has produced one patent application.
Piezotronics is a term coined in by Prof Zhong Lin Wang (Georgia Institute of Technology, Atlanta, USA) and describes the exploitation of strain and deformation internal polarization fields in polar semiconductors. Being a property of polar semiconductors piezoelectricity is present in both III-V and II-VI compounds, such as the technologically important ZnO. For many years piezoelectricity was included in the design of devices only to first order. In recent years a great deal of evidence, both model and experimental data, has been generated that such effects need to be included to at least second order. The inclusion of such nonlinear effects produces surprising and non-intuitive results, notably the generation of fields of opposite polarity compared to the prediction of linear piezoelectricity and the possibility of enhancing the piezoelectric polarization by a factor of 5-10 under particular deformations. In this presentation Dr. Max Migliorato will show the evidence for nonlinear effects and discuss the possible applications to light emitting diodes, quantum dot emitters and energy harvesting devices, the potential for Graphene as a piezoelectric material.
报告时间：2014年12月11日（星期四）上午10:00
