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 | |
| State | Published - Aug 2 2018 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
Cite this
Generation of Coherent Optical Phonons in Methylammonium Lead Iodide Thin Films. / Fei, Chengbin; Sarmiento, Julio S.; Wang, He.
In: Journal of Physical Chemistry C, Vol. 122, No. 30, 02.08.2018, p. 17035-17041.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Generation of Coherent Optical Phonons in Methylammonium Lead Iodide Thin Films
AU - Fei, Chengbin
AU - Sarmiento, Julio S.
AU - Wang, He
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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U2 - 10.1021/acs.jpcc.8b03529
DO - 10.1021/acs.jpcc.8b03529
M3 - Article
AN - SCOPUS:85049907396
VL - 122
SP - 17035
EP - 17041
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 30
ER -