Past Events

Abstract
 

In the recent development of solar cells, metal halide perovskite AMX₃ (A = organic cation, M = metal cation, and X = halogen anion) solar cells stand out among others. These metal halide perovskite semiconductor materials have several desirable characteristics including low density of defects or impurities, long charge carrier diffusion length, effective collection of charges, and simple fabrication process. A rapid development of perovskite solar cells has been achieved in the recent years with the power conversion efficiency (PCE) raising from initially 3.8% to certified 22.1% according to NREL. On the other hand, metal halide perovskite is also a good candidate for fabricating light emitting diodes (LEDs). When compared with common organic light emitting materials, perovskite could produce narrower emission hence the color purity will be better. It also has excellent color tunability and higher tolerance to structural defects compared to inorganic quantum dots. In particular, lower dimensionality layered perovskite has potential for fabricating LEDs with higher external quantum efficiency due to high exciton binding energy (several hundreds meV), which is resulted from enhanced electron hole interactions in natural quantum-well structures such as 2D layered perovskite. In this seminar, perovskite morphologies, related synthesis techniques, novel perovskite materials with bright light emission will be discussed. 

Anyone interested is welcome to attend.