BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Lead halide perovskite nanocrystals:  the interplay between morpho
 logy and optical properties - Prof Dr Alexander Urban
DTSTART:20181023T134500Z
DTEND:20181023T144500Z
UID:TALK113839@talks.cam.ac.uk
CONTACT:Emrys Evans
DESCRIPTION:Halide perovskite nanocrystals are prepared via several synthe
 tic routes to obtain dimension-controlled nanocubes\, nanoplatelets or nan
 owires. We investigate the effect of size and dimensionality on the optica
 l and electronic properties of the nanocrystals\, focusing on quantum-conf
 inement and carrier dynamics. With binding energies of up to 300 meV\, 2D 
 nanoplatelets exhibit many properties reminiscent of epitaxially grown qua
 ntum wells but at room temperature. However\, due to their unique geometry
  and organic ligand surrounding\, they exhibit vastly different carrier re
 laxation dynamics\, with a strong dependence on the thickness of the sampl
 es. These nanoplatelets are shown to be excellent emitters in the blue spe
 ctral region\, where perovskite nanocrystals typically perform poorly. Ino
 rganic Cs-based nanocubes\, which have previously displayed extremely high
  quantum yields\, are used as precursors to create larger structures. We e
 xplore the energetic and electronic coupling between the NCs and explore t
 he resulting optical properties\, especially for light harvesting and ligh
 t emitting applications.
LOCATION:Kapitza Seminar Room\, Kapitza\, Cavendish laboratory
END:VEVENT
END:VCALENDAR