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Title: Accelerated polaron formation in perovskite quantum dots monitored via picosecond infrared spectroscopy
Authors: Nuber, Matthias
Tan, Qi Ying
Sandner, Daniel
Yin, Jun
Kienberger, Reinhard
Soci, Cesare
Iglev, Hristo
Keywords: Science::Physics
Issue Date: 2023
Source: Nuber, M., Tan, Q. Y., Sandner, D., Yin, J., Kienberger, R., Soci, C. & Iglev, H. (2023). Accelerated polaron formation in perovskite quantum dots monitored via picosecond infrared spectroscopy. Journal of Materials Chemistry C, 11(10), 3581-3587.
Project: A18A7b0058 
Journal: Journal of Materials Chemistry C
Abstract: The formation and nature of polarons in perovskite quantum dots (QDs) are still unclear. Due to the very limited crystal size and quantum confinement, influences on the polaron stabilization dynamics could be expected. Here, we investigate the coupling of photoexcited charges to vibrational modes in mixed cation lead halide Cs0.2FA0.8PbBr3 QDs via picosecond mid-infrared spectroscopy in comparison to the bulk film. We find additional processes occurring in an infrared activated vibrational (IRAV) mode compared to the ground-state bleaching and screened carrier background signal. Using that mode as a proxy for the charge-molecular bond coupling, we interpret additional time constant as a polaron stabilization time. With the confinement effects present in the QDs, this time shortens from tens of picoseconds in the bulk to only a few picoseconds.
ISSN: 2050-7526
DOI: 10.1039/d2tc04519b
Schools: School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Research Centres: The Photonics Institute 
Centre for Disruptive Photonic Technologies (CDPT) 
Energy Research Institute @ NTU (ERI@N) 
Rights: © 2023 The Royal Society of Chemistry. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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