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Open AccessArticle

Charge Carrier Relaxation in Colloidal FAPbI3 Nanostructures Using Global Analysis

1
Université Paris-Saclay, CEA, CNRS, Laboratoire Interactions, Dynamiques et Lasers (LIDYL), 91191 Gif-sur-Yvette, France
2
Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière (ILM), F-69622 Villeurbanne, France
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(10), 1897; https://doi.org/10.3390/nano10101897
Received: 6 August 2020 / Revised: 9 September 2020 / Accepted: 17 September 2020 / Published: 23 September 2020
(This article belongs to the Special Issue Nanocrystals: Synthesis, Properties and Applications)
We study the hot charge carrier relaxation process in weakly confined hybrid lead iodide perovskite colloidal nanostructures, FAPbI3 (FA = formaminidium), using femtosecond transient absorption (TA). We compare the conventional analysis method based on the extraction of the carrier temperature (Tc) by fitting the high-energy tail of the band-edge bleach with a global analysis method modeling the continuous evolution of the spectral lineshape in time using a simple sequential kinetic model. This practical approach results in a more accurate way to determine the charge carrier relaxation dynamics. At high excitation fluence (density of charge carriers above 1018 cm−3), the cooling time increases up to almost 1 ps in thick nanoplates (NPs) and cubic nanocrystals (NCs), indicating the hot phonon bottleneck effect. Furthermore, Auger heating resulting from the multi-charge carrier recombination process slows down the relaxation even further to tens and hundreds of picoseconds. These two processes could only be well disentangled by analyzing simultaneously the spectral lineshape and amplitude evolution. View Full-Text
Keywords: hot charge carrier relaxation; Auger recombination; colloidal perovskite nanocrystals; transient absorption spectroscopy hot charge carrier relaxation; Auger recombination; colloidal perovskite nanocrystals; transient absorption spectroscopy
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MDPI and ACS Style

Franco, C.V.; Mahler, B.; Cornaggia, C.; Gustavsson, T.; Cassette, E. Charge Carrier Relaxation in Colloidal FAPbI3 Nanostructures Using Global Analysis. Nanomaterials 2020, 10, 1897.

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