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Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120%

Author

Listed:
  • Nathaniel J. L. K. Davis

    (Cavendish Laboratory, University of Cambridge)

  • Marcus L. Böhm

    (Cavendish Laboratory, University of Cambridge)

  • Maxim Tabachnyk

    (Cavendish Laboratory, University of Cambridge)

  • Florencia Wisnivesky-Rocca-Rivarola

    (University of Cambridge)

  • Tom C. Jellicoe

    (Cavendish Laboratory, University of Cambridge)

  • Caterina Ducati

    (University of Cambridge)

  • Bruno Ehrler

    (Center for Nanophotonics, FOM Institute AMOLF)

  • Neil C. Greenham

    (Cavendish Laboratory, University of Cambridge)

Abstract

Multiple-exciton generation—a process in which multiple charge-carrier pairs are generated from a single optical excitation—is a promising way to improve the photocurrent in photovoltaic devices and offers the potential to break the Shockley–Queisser limit. One-dimensional nanostructures, for example nanorods, have been shown spectroscopically to display increased multiple exciton generation efficiencies compared with their zero-dimensional analogues. Here we present solar cells fabricated from PbSe nanorods of three different bandgaps. All three devices showed external quantum efficiencies exceeding 100% and we report a maximum external quantum efficiency of 122% for cells consisting of the smallest bandgap nanorods. We estimate internal quantum efficiencies to exceed 150% at relatively low energies compared with other multiple exciton generation systems, and this demonstrates the potential for substantial improvements in device performance due to multiple exciton generation.

Suggested Citation

  • Nathaniel J. L. K. Davis & Marcus L. Böhm & Maxim Tabachnyk & Florencia Wisnivesky-Rocca-Rivarola & Tom C. Jellicoe & Caterina Ducati & Bruno Ehrler & Neil C. Greenham, 2015. "Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120%," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9259
    DOI: 10.1038/ncomms9259
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