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Issue 45, 2011
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Electronic and surface properties of PbS nanoparticles exhibiting efficient multiple exciton generation

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Abstract

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 × Eg 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.

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

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Article information


Submitted
18 Jul 2011
Accepted
15 Sep 2011
First published
12 Oct 2011

Phys. Chem. Chem. Phys., 2011,13, 20275-20283
Article type
Paper

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

S. J. O. Hardman, D. M. Graham, S. K. Stubbs, B. F. Spencer, E. A. Seddon, H. Fung, S. Gardonio, F. Sirotti, M. G. Silly, J. Akhtar, P. O'Brien, D. J. Binks and W. R. Flavell, Phys. Chem. Chem. Phys., 2011, 13, 20275
DOI: 10.1039/C1CP22330E

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