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Hot-electron transfer in quantum-dot heterojunction films

Author

Listed:
  • Gianluca Grimaldi

    (Delft University of Technology)

  • Ryan W. Crisp

    (Delft University of Technology)

  • Stephanie Brinck

    (Vrije Universiteit)

  • Felipe Zapata

    (Vrije Universiteit
    Netherlands eScience Center)

  • Michiko Ouwendorp

    (Delft University of Technology)

  • Nicolas Renaud

    (Delft University of Technology)

  • Nicholas Kirkwood

    (Delft University of Technology)

  • Wiel H. Evers

    (Delft University of Technology
    Delft University of Technology)

  • Sachin Kinge

    (Materials Research and Development)

  • Ivan Infante

    (Vrije Universiteit)

  • Laurens D. A. Siebbeles

    (Delft University of Technology)

  • Arjan J. Houtepen

    (Delft University of Technology)

Abstract

Thermalization losses limit the photon-to-power conversion of solar cells at the high-energy side of the solar spectrum, as electrons quickly lose their energy relaxing to the band edge. Hot-electron transfer could reduce these losses. Here, we demonstrate fast and efficient hot-electron transfer between lead selenide and cadmium selenide quantum dots assembled in a quantum-dot heterojunction solid. In this system, the energy structure of the absorber material and of the electron extracting material can be easily tuned via a variation of quantum-dot size, allowing us to tailor the energetics of the transfer process for device applications. The efficiency of the transfer process increases with excitation energy as a result of the more favorable competition between hot-electron transfer and electron cooling. The experimental picture is supported by time-domain density functional theory calculations, showing that electron density is transferred from lead selenide to cadmium selenide quantum dots on the sub-picosecond timescale.

Suggested Citation

  • Gianluca Grimaldi & Ryan W. Crisp & Stephanie Brinck & Felipe Zapata & Michiko Ouwendorp & Nicolas Renaud & Nicholas Kirkwood & Wiel H. Evers & Sachin Kinge & Ivan Infante & Laurens D. A. Siebbeles & , 2018. "Hot-electron transfer in quantum-dot heterojunction films," Nature Communications, Nature, vol. 9(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04623-9
    DOI: 10.1038/s41467-018-04623-9
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    Cited by:

    1. Jayarathna, Lasinidu & Kent, Geoff & O’Hara, Ian & Hobson, Philip, 2022. "Geographical information system based fuzzy multi criteria analysis for sustainability assessment of biomass energy plant siting: A case study in Queensland, Australia," Land Use Policy, Elsevier, vol. 114(C).

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