Accelerated polaron formation in perovskite quantum dots monitored via picosecond infrared spectroscopy

Matthias Nuber; Qi Ying Tan; Daniel Sandner; Jun Yin; Reinhard Kienberger; Cesare Soci; Hristo Iglev

doi:10.1039/d2tc04519b

Accelerated polaron formation in perovskite quantum dots monitored via picosecond infrared spectroscopy

Matthias Nuber, Qi Ying Tan, Daniel Sandner, Jun Yin, Reinhard Kienberger, Cesare Soci, Hristo Iglev

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3 Scopus citations

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 Cs_0.2FA_0.8PbBr₃ 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.

Original language	English
Pages (from-to)	3581-3587
Number of pages	7
Journal	Journal of Materials Chemistry C
Volume	11
Issue number	10
DOIs	https://doi.org/10.1039/d2tc04519b
State	Published - 6 Feb 2023

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title = "Accelerated polaron formation in perovskite quantum dots monitored via picosecond infrared spectroscopy",

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.",

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T1 - Accelerated polaron formation in perovskite quantum dots monitored via picosecond infrared spectroscopy

AU - Nuber, Matthias

AU - Tan, Qi Ying

AU - Sandner, Daniel

AU - Yin, Jun

AU - Kienberger, Reinhard

AU - Soci, Cesare

AU - Iglev, Hristo

PY - 2023/2/6

Y1 - 2023/2/6

N2 - 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.

AB - 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.

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Accelerated polaron formation in perovskite quantum dots monitored via picosecond infrared spectroscopy

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