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

Samantha J.O. Hardman; Darren M. Graham; Stuart K. Stubbs; Ben F. 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

doi:10.1039/c1cp22330e

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

Samantha J.O. Hardman
, Darren M. Graham
, Stuart K. Stubbs
, Ben F. 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

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	20275-20283
Number of pages	9
Journal	Physical Chemistry Chemical Physics
Volume	13
Issue number	45
DOIs	https://doi.org/10.1039/c1cp22330e
Publication status	Published - 7 Dec 2011
Externally published	Yes

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Hardman, S. J. O., Graham, D. M., Stubbs, S. K., Spencer, B. F., Seddon, E. A., Fung, H. T., Gardonio, S., Sirotti, F., Silly, M. G., Akhtar, J., O'Brien, P., Binks, D. J., & Flavell, W. R. (2011). Electronic and surface properties of PbS nanoparticles exhibiting efficient multiple exciton generation. Physical Chemistry Chemical Physics, 13(45), 20275-20283. https://doi.org/10.1039/c1cp22330e

@article{07d5636c81f0465c9113ea97ad1258fc,

title = "Electronic and surface properties of PbS nanoparticles exhibiting efficient multiple exciton generation",

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.",

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

year = "2011",

month = dec,

day = "7",

doi = "10.1039/c1cp22330e",

language = "English",

volume = "13",

pages = "20275--20283",

journal = "Physical Chemistry Chemical Physics",

issn = "1463-9076",

number = "45",

}

Hardman, SJO, Graham, DM, Stubbs, SK, Spencer, BF, Seddon, EA, Fung, HT, Gardonio, S, Sirotti, F, Silly, MG, Akhtar, J, O'Brien, P, Binks, DJ & Flavell, WR 2011, 'Electronic and surface properties of PbS nanoparticles exhibiting efficient multiple exciton generation', Physical Chemistry Chemical Physics, vol. 13, no. 45, pp. 20275-20283. https://doi.org/10.1039/c1cp22330e

TY - JOUR

T1 - Electronic and surface properties of PbS nanoparticles exhibiting efficient multiple exciton generation

AU - Hardman, Samantha J.O.

AU - Graham, Darren M.

AU - Stubbs, Stuart K.

AU - Spencer, Ben F.

AU - Seddon, Elaine A.

AU - Fung, Ho Ting

AU - Gardonio, Sandra

AU - Sirotti, Fausto

AU - Silly, Mathieu G.

AU - Akhtar, Javeed

AU - O'Brien, Paul

AU - Binks, David J.

AU - Flavell, Wendy R.

PY - 2011/12/7

Y1 - 2011/12/7

N2 - 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.

AB - 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.

U2 - 10.1039/c1cp22330e

DO - 10.1039/c1cp22330e

M3 - Article

AN - SCOPUS:81255138245

SN - 1463-9076

VL - 13

SP - 20275

EP - 20283

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 45

ER -

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

Abstract

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