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

Valerio D’Innocenzo, Giulia Grancini, Marcelo J. P. Alcocer, Ajay Ram Srimath Kandada, Samuel D. Stranks, Michael M. Lee, Guglielmo Lanzani, Henry J. Snaith () and Annamaria Petrozza ()
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Valerio D’Innocenzo: Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia
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
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
Henry J. Snaith: University of Oxford, Clarendon Laboratory
Annamaria Petrozza: Center for Nano Science and Technology@PoliMi, Istituto Italiano di Tecnologia

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms4586

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