Electronic and surface properties of PbS nanoparticles exhibiting efficient multiple exciton generation

Ultrafast transient absorption measurements have been used to study multiple exciton generation in solutions of PbS nanoparticles vigorously stirred to avoid the effects of photocharging. The threshold and slope efficiency of multiple exciton generation are found to be 2.5 ± 0.2 ×E(g) and 0.34 ± 0.0...

Full description

Saved in:
Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2011-01, Vol.13 (45), p.20275-20283
Main Authors: HARDMAN, Samantha J. O, GRAHAM, Darren M, O'BRIEN, Paul, BINKS, David J, FLAVELL, Wendy R, STUBBS, Stuart K, SPENCER, Ben F, SEDDON, Elaine A, FUNG, Ho-Ting, GARDONIO, Sandra, SIROTTI, Fausto, SILLY, Mathieu G, AKHTAR, Javeed
Format: Article
Language:English
Subjects:
Aging
Chemistry
Colloidal state and disperse state
Electronics
Exact sciences and technology
Excitation
General and physical chemistry
Nanoparticles
Oxides
Photoemission
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Physical chemistry
Surface physical chemistry
Surface properties
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ultrafast transient absorption measurements have been used to study multiple exciton generation in solutions of PbS nanoparticles vigorously stirred to avoid the effects of photocharging. The threshold and slope efficiency of multiple exciton generation are found to be 2.5 ± 0.2 ×E(g) and 0.34 ± 0.08, respectively. Photoemission measurements as a function of nanoparticle size and ageing show that the position of the valence band maximum is pinned by surface effects, and that a thick layer of surface oxide is rapidly formed at the nanoparticle surfaces on exposure to air.
ISSN:1463-9076
1463-9084
DOI:10.1039/c1cp22330e