title: Narrow Linewidth Excitonic Emission in Organic-Inorganic Lead Iodide Perovskite Single Crystals.
abstract: Hybrid perovskite thin films have demonstrated impressive performance for solar energy conversion and optoelectronic applications. However, further progress will benefit from a better knowledge of the intrinsic photophysics of materials. Here, the temperature-dependent emission properties of CH3NH3PbI3single crystals are investigated and compared to those of thin polycrystalline films by means of steady-state and time-resolved photoluminescence spectroscopy. Single crystals photoluminescence present a sharp excitonic emission at high energy, with full width at half maximum of only 5 meV, assigned to free excitonic recombination. We highlight a strong thermal broadening of the free excitonic emission, due to exciton-LO-phonon coupling. The emission turned to be very short-lived with a subnanosecond dynamics, mainly induced by the fast trapping of the excitons. The free excitonic emission is completely absent of the thin film spectra, which are dominated by trap state bands.
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay , 91405 Orsay Cedex, France.
authors.forename: Hiba
authors.initials: H
authors.lastname: Diab
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay , 91405 Orsay Cedex, France.
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Trippé-Allard
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay , 91405 Orsay Cedex, France.
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Lédée
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay , 91405 Orsay Cedex, France.
authors.forename: Khaoula
authors.initials: K
authors.lastname: Jemli
authors.affiliation: Groupe d'Etude de la Matiére Condensée, CNRS, Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay , 45 Avenue des Etats-Unis, 78035, Versailles, France.
authors.forename: Christèle
authors.initials: C
authors.lastname: Vilar
authors.affiliation: Groupe d'Etude de la Matiére Condensée, CNRS, Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay , 45 Avenue des Etats-Unis, 78035, Versailles, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Bouchez
authors.affiliation: Laboratoire de Physique des Solides, Université Paris-Sud, Université Paris-Saclay , Bât 510, 91405 Orsay, France.
authors.forename: Vincent L R
authors.initials: VL
authors.lastname: Jacques
authors.affiliation: Laboratoire de Physique des Solides, Université Paris-Sud, Université Paris-Saclay , Bât 510, 91405 Orsay, France.
authors.forename: Antonio
authors.initials: A
authors.lastname: Tejeda
authors.affiliation: UMR FOTON, CNRS, INSA-Rennes, F- 35708, Rennes, France.
authors.forename: Jacky
authors.initials: J
authors.lastname: Even
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay , 91405 Orsay Cedex, France.
authors.forename: Jean-Sébastien
authors.initials: JS
authors.lastname: Lauret
authors.affiliation: Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay , 91405 Orsay Cedex, France.
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Deleporte
authors.affiliation: Groupe d'Etude de la Matiére Condensée, CNRS, Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay , 45 Avenue des Etats-Unis, 78035, Versailles, France.
authors.forename: Damien
authors.identifier: http://orcid.org/0000-0002-4865-8536
authors.initials: D
authors.lastname: Garrot