Generation of Coherent Optical Phonons in Methylammonium Lead Iodide Thin Films

Chengbin Fei; Julio S. Sarmiento; He Wang

doi:10.1021/acs.jpcc.8b03529

Generation of Coherent Optical Phonons in Methylammonium Lead Iodide Thin Films

Chengbin Fei, Julio S. Sarmiento, He Wang

Physics

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

A long-lived hot carrier in organic-inorganic hybrid perovskite materials is possibly assisted by the large polaron and hot phonon bottleneck. The phonon plays a significant role in the properties of hybrid perovskites. Coherent phonon refers to the in-phase vibration of the crystal lattice. Here, temperature-dependent, fluence-dependent, and polarization-dependent transient absorption spectroscopy is utilized to study the coherent phonon in methylammonium lead iodide. A coherent optical phonon is observed due to the existence of Pb-I-Pb angular distortion at 24-33 cm^-1 in both tetragonal and orthorhombic phases. Oscillation from the excited-state absorption is also observed, suggesting coupling between the coherent phonon and photoexcited state. Oscillation of the coherent phonon attenuates with increasing environmental temperature. The dependence of the coherent phonon on polarization of the pulse and quantitative analysis indicates that the generation mechanism is impulsive stimulated Raman scattering and transient depletion field screening.

Original language	English (US)
Pages (from-to)	17035-17041
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	122
Issue number	30
DOIs	https://doi.org/10.1021/acs.jpcc.8b03529
State	Published - Aug 2 2018

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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@article{3f7f366192b940a9b155a52d35854bec,

title = "Generation of Coherent Optical Phonons in Methylammonium Lead Iodide Thin Films",

abstract = "A long-lived hot carrier in organic-inorganic hybrid perovskite materials is possibly assisted by the large polaron and hot phonon bottleneck. The phonon plays a significant role in the properties of hybrid perovskites. Coherent phonon refers to the in-phase vibration of the crystal lattice. Here, temperature-dependent, fluence-dependent, and polarization-dependent transient absorption spectroscopy is utilized to study the coherent phonon in methylammonium lead iodide. A coherent optical phonon is observed due to the existence of Pb-I-Pb angular distortion at 24-33 cm-1 in both tetragonal and orthorhombic phases. Oscillation from the excited-state absorption is also observed, suggesting coupling between the coherent phonon and photoexcited state. Oscillation of the coherent phonon attenuates with increasing environmental temperature. The dependence of the coherent phonon on polarization of the pulse and quantitative analysis indicates that the generation mechanism is impulsive stimulated Raman scattering and transient depletion field screening.",

author = "Chengbin Fei and Sarmiento, {Julio S.} and He Wang",

note = "Funding Information: This work was supported by the Air Force Office of Scientific Research (AFOSR) Young Investigator Research Program (YIP) Award FA9550-17-1-0099. H.W. was also supported by a Provost Research Award from the University of Miami.",

year = "2018",

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doi = "10.1021/acs.jpcc.8b03529",

language = "English (US)",

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journal = "Journal of Physical Chemistry C",

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AU - Fei, Chengbin

AU - Sarmiento, Julio S.

AU - Wang, He

N1 - Funding Information: This work was supported by the Air Force Office of Scientific Research (AFOSR) Young Investigator Research Program (YIP) Award FA9550-17-1-0099. H.W. was also supported by a Provost Research Award from the University of Miami.

PY - 2018/8/2

Y1 - 2018/8/2

N2 - A long-lived hot carrier in organic-inorganic hybrid perovskite materials is possibly assisted by the large polaron and hot phonon bottleneck. The phonon plays a significant role in the properties of hybrid perovskites. Coherent phonon refers to the in-phase vibration of the crystal lattice. Here, temperature-dependent, fluence-dependent, and polarization-dependent transient absorption spectroscopy is utilized to study the coherent phonon in methylammonium lead iodide. A coherent optical phonon is observed due to the existence of Pb-I-Pb angular distortion at 24-33 cm-1 in both tetragonal and orthorhombic phases. Oscillation from the excited-state absorption is also observed, suggesting coupling between the coherent phonon and photoexcited state. Oscillation of the coherent phonon attenuates with increasing environmental temperature. The dependence of the coherent phonon on polarization of the pulse and quantitative analysis indicates that the generation mechanism is impulsive stimulated Raman scattering and transient depletion field screening.

AB - A long-lived hot carrier in organic-inorganic hybrid perovskite materials is possibly assisted by the large polaron and hot phonon bottleneck. The phonon plays a significant role in the properties of hybrid perovskites. Coherent phonon refers to the in-phase vibration of the crystal lattice. Here, temperature-dependent, fluence-dependent, and polarization-dependent transient absorption spectroscopy is utilized to study the coherent phonon in methylammonium lead iodide. A coherent optical phonon is observed due to the existence of Pb-I-Pb angular distortion at 24-33 cm-1 in both tetragonal and orthorhombic phases. Oscillation from the excited-state absorption is also observed, suggesting coupling between the coherent phonon and photoexcited state. Oscillation of the coherent phonon attenuates with increasing environmental temperature. The dependence of the coherent phonon on polarization of the pulse and quantitative analysis indicates that the generation mechanism is impulsive stimulated Raman scattering and transient depletion field screening.

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