Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 45, Pages 20275-20283Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1cp22330e
Keywords
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Funding
- Engineering and Physical Sciences Research Council [EP/E036287/1]
- Northwest Science Fund (NWDA)
- European Community [FP7/2007-2013, 226716]
- Engineering and Physical Sciences Research Council [EP/F04772X/1] Funding Source: researchfish
- Science and Technology Facilities Council [ST/G008248/1] Funding Source: researchfish
- EPSRC [EP/E036287/1, EP/F04772X/1] Funding Source: UKRI
- STFC [ST/G008248/1] Funding Source: UKRI
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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 x 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.
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