6.06.2019, godz. 18:00, Gmach Technologii Chemicznej PW, Aula Czochralskiego, ul. Koszykowa 75.
Semiconductor nanocrystals: past, present, future
(Institute of Nanoscience & Cryogenics, CEA Grenoble, Francja)
Colloidal semiconductor nanocrystals of II-VI (e.g. CdSe), IV-VI (e.g. PbS) and III-V (e.g. InP) compounds exhibit unique optical properties and have been in the research focus for more than 30 years. They consist of a small inorganic core generally in the range of 1-10 nm, which is covered by organic surface ligands assuring their colloidal stability. Their most intriguing feature is their size-dependent band gap, which enables to tune their absorption and photoluminescence spectra simply by changing their dimensions. Metal halide perovskite nanocrystals (e.g. CsPbBr3), on the other hand, are newcomers in this field, which exhibit exciting physics arising from their peculiar structural, electronic and excitonic properties. Both families are very promising building blocks for numerous applications, in particular in the fields of optoelectronics and solar energy conversion. In this lecture, after a brief historical outline the fundamental properties of the two types of nanocrystals will be discussed and some examples of applications as well as perspectives in this field will be given.