Hybrid organic-inorganic perovskites (HOIPs) have attracted considerable attention in the past years as photoactive materials for low-cost, high-performance photovoltaics. Polaron formation through electron-phonon coupling has been recognized as the leading mechanism governing charge carrier transport and recombination in HOIPs. In this work, two types of MAPbBr3 film samples deposited on different substrates (transparent insulating SrTiO3 and a heterostructure mimicking a functioning photovoltaic cell) were photoexcited with above-bandgap radiation at 450 nm, and the effects of illumination on the sample were analyzed in the infrared region. The infrared absorbance detected at different powers of the photoexciting laser allowed us to obtain an estimate of the characteristic decay time of photoexcited polaron population of the order of 100-1000 ns. When focusing on the absorption features of the MA molecular cation in the region of the NH stretching modes, we observed the influence of hydrogen bonding and the effect of the polaron dynamics on the cation reorientation. © 2023 The Authors. Published by American Chemical Society

Signatures of polaron dynamics in photoexcited MAPbBr3 by infrared spectroscopy / Carpenella, Valentina; Fasolato, Claudia; Di Girolamo, Diego; Barichello, Jessica; Matteocci, Fabio; Petrillo, Caterina; Dini, Danilo; Nucara, Alessandro. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - 127:45(2023), pp. 22097-22104. [10.1021/acs.jpcc.3c03668]

Signatures of polaron dynamics in photoexcited MAPbBr3 by infrared spectroscopy

Carpenella, Valentina
Primo
Investigation
;
Fasolato, Claudia
Secondo
;
Di Girolamo, Diego;Dini, Danilo
Penultimo
Formal Analysis
;
Nucara, Alessandro
Ultimo
Conceptualization
2023

Abstract

Hybrid organic-inorganic perovskites (HOIPs) have attracted considerable attention in the past years as photoactive materials for low-cost, high-performance photovoltaics. Polaron formation through electron-phonon coupling has been recognized as the leading mechanism governing charge carrier transport and recombination in HOIPs. In this work, two types of MAPbBr3 film samples deposited on different substrates (transparent insulating SrTiO3 and a heterostructure mimicking a functioning photovoltaic cell) were photoexcited with above-bandgap radiation at 450 nm, and the effects of illumination on the sample were analyzed in the infrared region. The infrared absorbance detected at different powers of the photoexciting laser allowed us to obtain an estimate of the characteristic decay time of photoexcited polaron population of the order of 100-1000 ns. When focusing on the absorption features of the MA molecular cation in the region of the NH stretching modes, we observed the influence of hydrogen bonding and the effect of the polaron dynamics on the cation reorientation. © 2023 The Authors. Published by American Chemical Society
2023
perovskite; infrared spectroscopy; polaron dynamics; solar cell
01 Pubblicazione su rivista::01a Articolo in rivista
Signatures of polaron dynamics in photoexcited MAPbBr3 by infrared spectroscopy / Carpenella, Valentina; Fasolato, Claudia; Di Girolamo, Diego; Barichello, Jessica; Matteocci, Fabio; Petrillo, Caterina; Dini, Danilo; Nucara, Alessandro. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - 127:45(2023), pp. 22097-22104. [10.1021/acs.jpcc.3c03668]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1693046
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