< BK21+ BEST Seminar Series Announcement> 

Time and Date : 11:00 ~ 12:00 Wednesday 08/28/2019

Place : D504, Engineering Building #4

Title : Molecular Engineering of Two-Dimensional Organic-Inorganic Hybrid Perovskites
Abstract:
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.

Presenter: Letian Dou, Professor / Davidson School of Chemical Engineering, Purdue University

Host: Prof. Ahn, Jong Hyun, Yonsei EEE