Physical Chemistry Chemical Physics, volume 18, issue 45, pages 31107-31114

Hot exciton cooling and multiple exciton generation in PbSe quantum dots

Manoj Kumar ¹

Stefano Vezzoli ²

Zilong Wang ¹

Varun Chaudhary ^{3, 4}

R RAMANUJAN ⁴

Gagik G. Gurzadyan ^{1, 5}

Annalisa Bruno ⁶

Cesare Soci ^{1, 2}

Hide authors affiliations Show authors affiliations: 6 affiliations

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, Singapore |

Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, Singapore |

Interdisciplinary Graduate School (IGS), Nanyang Technological University, 50 Nanyang Avenue, Singapore, Singapore |

⁴

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore |

⁵

Institute of Artificial Photosynthesis, State Key Laboratory of Fine Chemical, Dalian University of Technology, Dalian, China |

⁶

Energy Research Institute @ NTU (ERI@N), Research Techno Plaza, X-Frontier Block, 50 Nanyang Drive, Singapore, Singapore |

Publication type: Journal Article

Publication date: 2016-10-19

Royal Society of Chemistry (RSC)

Journal: Physical Chemistry Chemical Physics

Quartile SCImago

Quartile WOS

Impact factor: 3.3

ISSN: 14639076, 14639084

DOI: 10.1039/c6cp03790a

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Physical and Theoretical Chemistry

General Physics and Astronomy

Abstract

Multiple exciton generation (MEG) is a promising process to improve the power conversion efficiency of solar cells. PbSe quantum dots (QDs) have shown reasonably high MEG quantum yield (QY), although the photon energy threshold for this process is still under debate. One of the reasons for this inconsistency is the complicated competition of MEG and hot exciton cooling, especially at higher excited states. Here, we investigate MEG QY and the origin of the photon energy threshold for MEG in PbSe QDs of three different sizes by studying the transient absorption (TA) spectra, both at the band gap (near infrared, NIR) and far from the band gap energy (visible range). The comparison of visible TA spectra and dynamics for different pump wavelengths, below, around and above the MEG threshold, provides evidence of the role of the Σ transition in slowing down the exciton cooling process that can help MEG to take over the phonon relaxation process. The universality of this behavior is confirmed by studying QDs of three different sizes. Moreover, our results suggest that MEG QY can be determined by pump-probe experiments probed above the band gap.

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Kumar M. et al. Hot exciton cooling and multiple exciton generation in PbSe quantum dots // Physical Chemistry Chemical Physics. 2016. Vol. 18. No. 45. pp. 31107-31114.

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Kumar M., Vezzoli S., Wang Z., Chaudhary V., RAMANUJAN R., Gurzadyan G. G., Bruno A., Soci C. Hot exciton cooling and multiple exciton generation in PbSe quantum dots // Physical Chemistry Chemical Physics. 2016. Vol. 18. No. 45. pp. 31107-31114.

RIS |

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TY - JOUR

DO - 10.1039/c6cp03790a

UR - https://doi.org/10.1039/c6cp03790a

TI - Hot exciton cooling and multiple exciton generation in PbSe quantum dots

T2 - Physical Chemistry Chemical Physics

AU - Vezzoli, Stefano

AU - Kumar, Manoj

AU - Wang, Zilong

AU - Chaudhary, Varun

AU - RAMANUJAN, R

AU - Gurzadyan, Gagik G.

AU - Bruno, Annalisa

AU - Soci, Cesare

PY - 2016

DA - 2016/10/19 00:00:00

PB - Royal Society of Chemistry (RSC)

SP - 31107-31114

IS - 45

VL - 18

SN - 1463-9076

SN - 1463-9084

ER -

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@article{2016_Kumar,

author = {Stefano Vezzoli and Manoj Kumar and Zilong Wang and Varun Chaudhary and R RAMANUJAN and Gagik G. Gurzadyan and Annalisa Bruno and Cesare Soci},

title = {Hot exciton cooling and multiple exciton generation in PbSe quantum dots},

journal = {Physical Chemistry Chemical Physics},

year = {2016},

volume = {18},

publisher = {Royal Society of Chemistry (RSC)},

month = {oct},

url = {https://doi.org/10.1039/c6cp03790a},

number = {45},

pages = {31107--31114},

doi = {10.1039/c6cp03790a}

}

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Kumar, Manoj, et al. “Hot exciton cooling and multiple exciton generation in PbSe quantum dots.” Physical Chemistry Chemical Physics, vol. 18, no. 45, Oct. 2016, pp. 31107-31114. https://doi.org/10.1039/c6cp03790a.

Found error?

Publisher

Royal Society of Chemistry (RSC)

Journal

Physical Chemistry Chemical Physics

Quartile SCImago

Quartile WOS

Impact factor

3.3

ISSN

14639076 (Print)
14639084 (Electronic)

Profiles

Soci, Cesare