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.
Peter Reiss is researcher at the Institute of Nanoscience & Cryogenics, CEA Grenoble (France), and Head of Laboratory Synthesis, Structure and Properties of Functional Materials (STEP). He graduated (1997) from University of Karlsruhe (Germany), and earned his PhD in inorganic chemistry under the supervision of Prof. Dieter Fenske (2000). His research activities focus on colloidal semiconductor nanocrystals, nanowires and metal halide perovskites: development of synthesis methods, study of nucleation and growth mechanisms, surface functionalization and assembly. He also explores the potential of these materials for use in energy conversion (photovoltaics, thermoelectrics) and storage, as emitters in LEDs, displays or in biological imaging and detection. Dr. Reiss acts as Associate Editor for Nanoscale Research Letters (Springer) and Journal of Nanomaterials (Hindawi), is Editorial Board Member of Scientific Reports (NPG), Advances in Natural Sciences: Nanoscience and Nanotechnology (IOP), Frontiers in Materials: Energy Materials (Frontiers) and Editorial Advisory Board Member of Journal of Materials Chemistry C (RSC).