[institut] SCL seminar (povodom izbora u zvanje), Nikola Prodanovic, petak 24. januar u 14:00

[Nenad Vukmirović]

Поштоване колегинице и колеге,

Позивам вас на семинар Лабораторије за примену рачунара у науци који ће 
у петак 24. јануара 2014. године у 14:00 у читаоници Института за физику 
одржати Никола Продановић (Лабораторија за примену рачунара у науци, 
Институт за физику Београд). Наслов семинара је:

Electronic transport in colloidal quantum dot supercrystals

Abstract:

Colloidal quantum dot supercrystals are novel nanostructured materials 
which appear very promising in potential optoelectronic applications and 
for fundamental study of electronic transport properties in condensed 
matter physics. Recent fabrication of high quality supercrystals with 
relatively strong inter-site electronic coupling and high size 
monodispersivity enabled high carrier mobilities slightly increasing 
with temperature decreasing. Due to such temperature behaviour it is 
believed that such transport is of metallic kind, so called coherent 
band-like transport.

We developed an accurate model accounting for electron-phonon 
interaction in colloidal quantum dot supercrystals that allowed us to 
identify the nature of charge carriers and the electrical transport 
regime. We find that in experimentally relevant CdSe nanocrystal solids 
the electron-phonon interaction is sufficiently strong that small 
polarons localized to single dots are formed.  Charge-carrier transport 
occurs by small polaron hopping between the dots with mobility that 
decreases with increasing the temperature. While such a temperature 
dependence of mobility is usually considered as a proof of band 
transport,  we show that the same type of dependence occurs in the 
system where transport occurs by small polaron hopping.


Срдачан поздрав,

-- 
Др Ненад Вукмировић,
Виши научни сарадник,
Лабораторија за примену рачунара у науци,
Институт за физику Београд,
Србија.
URL: http://www.scl.rs/nenad