Eventos
O SEMINARIO DO PROF. JOCHEN FELDMANN FOI FINALMENTE CANCELADO
O 3 de novembro de 2023, o Prof. Jochen Feldmann (Chair of Photonics and Optoelectronics Nano-Institute Munich, LMU Munich) ofrecerá o seminario "Electronic and Phononic Dynamics in Halide Based Nanocrystals”.
Será ás 11:00 horas na Sala de Audiovisuais (Módulo 6 do CINBIO).
ABSTRACT:
Halide based semiconductors have enabled new opportunities for the synthesis of colloidal nanocrystals offering a surprisingly versatile construction kit for tailored optical, optoelectronic and even photo-electrochemical nanosystems. Lead halide based nanocrystals show superb optical emission properties even at room-temperature. Interestingly, a simple two-band model with low effective masses is often sufficient to explain even spin-dependent relaxation phenomena. Meanwhile not only nanoplatelets and cubes but also spherical quantum dots can be synthesized with impressive control leading to well-pronounced excitonic confinement effects. Less toxic bismuth-based halide nanocrystals are mostly characterized by indirect band-structures resulting in long lifetimes and occasionally in charge separation favourable for photocatalytic processes. The soft ionic lattice easily couples to optical excitations leading to polaronic effects and in the case of short pulse excitation to the generation of coherent phonons.
