Liangfeng Sun (Bowling Green State University)

Colloidal nanocrystals are promising materials for various optoelectronic device applications by their size- and shape-tunable optical and electronic properties. There is great interest in the development of low-temperature solution processing of nanocrystal-based devices for next-generation photovoltaics, photodetectors, light-emitting diodes (LEDs), and lasers.

In this talk, the speaker will firstly introduce the fundamental physics underlying the novel properties of nanocrystals. Then he will talk about the typical synthetic method of colloidal nanocrystals. The mechanisms of the anisotropic growth of the nanocrystals to a 1D or 2D structure will be discussed. In contrast to 0D quantum dots, the superior properties of the 2D nanosheets will be shown. The nanosheet-related topics including growth control, thickness-dependent energy gap, core/shell structure, surface passivation, and exciton binding energy will be discussed.  The preliminary results of the 2D nanosheets-based LEDs and the amplified spontaneous emission will be demonstrated.