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

Samantha J O Hardman, Darren M. Graham, Stuart K. Stubbs, Ben Spencer, Elaine A. Seddon, Ho Ting Fung, Sandra Gardonio, Fausto Sirotti, Mathieu G. Silly, Javeed Akhtar, Paul O'Brien, David J. Binks, Wendy R. Flavell

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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 × 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. © 2011 the Owner Societies.
    Original languageEnglish
    Pages (from-to)20275-20283
    Number of pages8
    JournalPhysical Chemistry Chemical Physics
    Volume13
    Issue number45
    DOIs
    Publication statusPublished - 7 Dec 2011

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