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Excitons versus free charges in organo-lead tri-halide perovskites

Author

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  • Valerio D’Innocenzo

    (Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia
    Politecnico di Milano, Piazza L. da Vinci, 32)

  • Giulia Grancini

    (Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia)

  • Marcelo J. P. Alcocer

    (Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia
    Politecnico di Milano, Piazza L. da Vinci, 32)

  • Ajay Ram Srimath Kandada

    (Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia)

  • Samuel D. Stranks

    (University of Oxford, Clarendon Laboratory)

  • Michael M. Lee

    (University of Oxford, Clarendon Laboratory)

  • Guglielmo Lanzani

    (Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia
    Politecnico di Milano, Piazza L. da Vinci, 32)

  • Henry J. Snaith

    (University of Oxford, Clarendon Laboratory)

  • Annamaria Petrozza

    (Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia)

Abstract

Excitonic solar cells, within which bound electron-hole pairs have a central role in energy harvesting, have represented a hot field of research over the last two decades due to the compelling prospect of low-cost solar energy. However, in such cells, exciton dissociation and charge collection occur with significant losses in energy, essentially due to poor charge screening. Organic–inorganic perovskites show promise for overcoming such limitations. Here, we use optical spectroscopy to estimate the exciton binding energy in the mixed-halide crystal to be in the range of 50 meV. We show that such a value is consistent with almost full ionization of the exciton population under photovoltaic cell operating conditions. However, increasing the total photoexcitation density, excitonic species become dominant, widening the perspective of this material for a host of optoelectronic applications.

Suggested Citation

  • Valerio D’Innocenzo & Giulia Grancini & Marcelo J. P. Alcocer & Ajay Ram Srimath Kandada & Samuel D. Stranks & Michael M. Lee & Guglielmo Lanzani & Henry J. Snaith & Annamaria Petrozza, 2014. "Excitons versus free charges in organo-lead tri-halide perovskites," Nature Communications, Nature, vol. 5(1), pages 1-6, May.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4586
    DOI: 10.1038/ncomms4586
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    Cited by:

    1. Choon, S.L. & Lim, H.N. & Ibrahim, I. & Zainal, Z. & Tan, K.B. & Foo, C.Y. & Ng, C.H., 2023. "New potential materials in advancement of photovoltaic and optoelectronic applications: Metal halide perovskite nanorods," Renewable and Sustainable Energy Reviews, Elsevier, vol. 171(C).
    2. Priyadarshini, P. & Senapati, S. & Naik, R., 2023. "Lead-free organic inorganic hybrid halide perovskites: An emerging candidate for bifunctional applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 186(C).

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