清华大学材料科学与工程研究院《材料科学论坛》

学术报告

报告题目：  New insights on halide perovskites from nanoparticle transformations, photodamage studies and hybridization with quantum dots

报告人：    Dan Oron (Dept. of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel)
报告时间：  2018年9月14日（周五），上午10:00

报告地点：  清华大学逸夫科学技术楼A205学术报告厅

联系人：    林红老师（62772672）

报告摘要：
The study of colloidal halide perovskites nanoparticles and their formation and transformation processes grants us with new insights about the stability and phase diagram of these materials. It also highlights the tremendous possibilities in the use of nano crystals in halide perovskites solar cells. Here we present results on the formation and growth mechanism of cesium lead halide (CsPbX3) nanocrystals which highlights the tremendous effects of surface passivation on their growth and crystal habit. Futhermore, we study the reversible transformation (in solution) between CsPbX3 and Cs4PbX6, driven by small modifications of the acid-base ratio in solution. These results reveal, on one hand, the rapid structural transformations these particles can undergo, and on the other point at routes to stabilize either phase. Finally, results on self-healing of perovskite crystals following builk damage and preliminary data on the photophysics of perovskite-quantum dot hybrids will be presented.

报告人简介：
Prof. Dan Oron investigates the optics of nanomaterials, particularly in the context of bioimaging applications. He earned his B.Sc. in mathematics and physics from the Hebrew university in 1994 and his M.Sc. in physics from Ben-Gurion University in 1998. In 2005 he received his Ph.D. in physics from the Weizmann Institute of Science, working on coherent nonlinear microscopy. After conducting postgraduate research at the Hebrew university, he joined the Weizmann Institute physics faculty in 2007, and until recently serves as the head of the department of physics of complex systems.