高分子物理与化学实验室将于7月3日（星期三）上午10:00在3号楼101会议室召开2019年高分子科学前沿讲座第六期，本次由侯剑辉老师组邀请Prof. Letian Dou（窦乐添）（Purdue University, USA）作报告，具体内容请参见附件。欢迎各位老师到场参加！

Dr. Letian Dou obtained his B.S. from Peking University in 2009. He then joined Prof. Yang Yang’s group at UCLA, and obtained his Ph.D. in 2014 (co-advised by Prof. Fred Wudl @UCSB in 2013). From 2014 to 2017, he was a postdoctoral fellow working with Prof. Peidong Yang at University of California, Berkeley. He is a recipient of Office of Naval Research Young Investigator Award (2019), MIT Technology Review Innovators Under 35-China (2018), and MRS Graduate Student Award (2014). He has published over 40 research papers with more than 10000 citations, including Science, Nat. Mater., Nat. Rev. Mater., Chem. Rev., Nat. Photonics, PNAS, Adv. Mater., J. Am. Chem. Soc.

Two-dimensional halide perovskites are exciting new semiconductors that show great promising in low cost and high performance optoelectronics devices including solar cells, LEDs, photodetectors, transistors, etc. These materials show great structure and property tunability, not only in the perovskite layer, but also along the 2D crystal edges and surfaces. In the first part of this talk, I will introduce our recent discoveries about the origin and the unique optical and electronic properties of the edge states of the 2D perovskite single crystals. In the second haft, I will present a molecular approach to the synthesis of high-quality organic-inorganic hybrid perovskite quantum wells through incorporating widely tunable organic semiconducting building blocks as the surface capping ligands. By introducing sterically tailored groups into the molecular motif, the strong self-aggregation of the conjugated organic molecules can be suppressed, and single crystalline organic-perovskite hybrid quantum wells and superlattices can be easily obtained via one-step solution-processing. Energy transfer and charge transfer between adjacent organic and inorganic layers are extremely fast and efficient, owing to the atomically-flat interface and ultra-small interlayer distance. Finally, I will briefly talk about the applications of these materials in high performance solar cells and field effect transistors.