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Issue 37, 2016
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Hot electron and hole dynamics in thiol-capped CdSe quantum dots revealed by 2D electronic spectroscopy

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Abstract

Colloidal quantum dots (QDs) have attracted interest as materials for opto-electronic applications, wherein their efficient energy use requires the understanding of carrier relaxation. In QDs capped by bifunctional thiols, used to attach the QDs to a surface, the relaxation is complicated by carrier traps. Using 2D spectroscopy at 77 K, we follow excitations in thiol-capped CdSe QDs with state specificity and high time resolution. We unambiguously identify the lowest state as an optically allowed hole trap, and identify an electron trap with excited-state absorption. The presence of traps changes the initial dynamics entirely by offering a different relaxation channel. 2D electronic spectroscopy enables us to pinpoint correlations between states and to easily separate relaxation from different starting states. We observe the direct rapid trapping of 1S3/2, 2S3/2, and 1S1/2 holes, and several competing electron relaxation processes from the 1Pe state.

Graphical abstract: Hot electron and hole dynamics in thiol-capped CdSe quantum dots revealed by 2D electronic spectroscopy

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Publication details

The article was received on 16 Jun 2016, accepted on 24 Aug 2016 and first published on 25 Aug 2016


Article type: Paper
DOI: 10.1039/C6CP04190F
Citation: Phys. Chem. Chem. Phys., 2016,18, 26199-26204
  • Open access: Creative Commons BY license
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    Hot electron and hole dynamics in thiol-capped CdSe quantum dots revealed by 2D electronic spectroscopy

    N. Lenngren, M. A. Abdellah, K. Zheng, M. J. Al-Marri, D. Zigmantas, K. Žídek and T. Pullerits, Phys. Chem. Chem. Phys., 2016, 18, 26199
    DOI: 10.1039/C6CP04190F

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