Unraveling exciton–phonon coupling in individual FAPbI3 nanocrystals emitting near-infrared single photons
File(s)
Author(s)
Type
Journal Article
Abstract
Formamidinium lead iodide (FAPbI3) exhibits the narrowest bandgap energy among lead halide perovskites, thus playing a pivotal role for the development of photovoltaics and near-infrared classical or quantum light sources. Here, we unveil the fundamental properties of FAPbI3 by spectroscopic investigations of nanocrystals of this material at the single-particle level. We show that these nanocrystals deliver near-infrared single photons suitable for quantum communication. Moreover, the low temperature photoluminescence spectra of FAPbI3 nanocrystals reveal the optical phonon modes responsible for the emission line broadening with temperature and a vanishing exciton–acoustic phonon interaction in these soft materials. The photoluminescence decays are governed by thermal mixing between fine structure states, with a two-optical phonon Raman scattering process. These results point to a strong Frölich interaction and to a phonon glass character that weakens the interactions of charge carriers with acoustic phonons and thus impacts their relaxation and mobility in these perovskites.
Date Issued
2018-08-20
Date Acceptance
2018-07-23
Citation
Nature Communications, 2018, 9 (1)
ISSN
2041-1723
Publisher
Nature Research
Journal / Book Title
Nature Communications
Volume
9
Issue
1
Copyright Statement
© 2018 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Identifier
https://doi.org/10.1038/s41467-018-05876-0
Subjects
Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
HALIDE PEROVSKITE NANOCRYSTALS
SOLAR-CELLS
QUANTUM DOTS
PHASE-TRANSITIONS
TEMPERATURE-DEPENDENCE
HYBRID PEROVSKITES
OPTICAL-PROPERTIES
FINE-STRUCTURE
FORMAMIDINIUM
EMISSION
MD Multidisciplinary
Publication Status
Published
Article Number
3318
Date Publish Online
2018-08-20