Venue: Polo Scientifico Tecnologico Fabio Ferrari -via Sommarive 9 - Povo
- Dott. Marco Califano - Ins of Microwaves and Photonics, University of Leeds, United Kingdom
"New insights into the transport mechanisms in colloidal quantum dot films"
Semiconductor colloidal quantum dots (CQDs) are routinely exploited as building blocks for electronic, optoelectronic and photoelectrochemical devices, in a variety of different architectures, mostly based on ordered 2D or 3D arrays of these nanostructures.
The presence of countless interfaces, with associated traps and potential steps, that the charge carriers need to cross in order to reach the electrodes where they can be collected, appears, however, a daunting obstacle to efficient transport in these devices.
This talk will first take a closer look at some of the most fearsome obstacles - the surface traps - in different materials and at the efficiency of the processes responsible for their population. We will then discuss whether bulk-like transport can be achieved in CQD films and which conditions are most favourable for achieving efficient miniband formation and large electron mobilities.