Electronic States Modulation by Coherent Optical Phonons in 2D Halide Perovskites
Fu, Jianhui ; Li, Mingjie ; Solanki, Ankur ; Xu, Qiang ; Lekina, Yulia ; Ramesh, Sankaran LU
; Shen, Ze Xiang
and Sum, Tze Chien
(2021)
In Advanced Materials
33(11).
- Abstract
Excitonic effects underpin the fascinating optoelectronic properties of 2D perovskites that are highly favorable for photovoltaics and light-emitting devices. Analogous to switching in transistors, manipulating these excitonic properties in 2D perovskites using coherent phonons could unlock new applications. Presently, a detailed understanding of this underlying mechanism remains modest. Herein, the origins of the carrier-phonon coupling in 2D perovskites using transient absorption (TA) spectroscopy are explicated. The exciton fine structure is modulated by coherent optical phonons dominated by the vibrational motion of the PbI6 octahedra via deformation potential. Originating from impulsive stimulated Raman scattering, these... (More)
Excitonic effects underpin the fascinating optoelectronic properties of 2D perovskites that are highly favorable for photovoltaics and light-emitting devices. Analogous to switching in transistors, manipulating these excitonic properties in 2D perovskites using coherent phonons could unlock new applications. Presently, a detailed understanding of this underlying mechanism remains modest. Herein, the origins of the carrier-phonon coupling in 2D perovskites using transient absorption (TA) spectroscopy are explicated. The exciton fine structure is modulated by coherent optical phonons dominated by the vibrational motion of the PbI6 octahedra via deformation potential. Originating from impulsive stimulated Raman scattering, these coherent vibrations manifest as oscillations in the TA spectrum comprising of the generation and detection processes of coherent phonons. This two-step process leads to a unique pump- and probe-energy dependence of the phonon modulation determined by the imaginary part of the refractive index and its derivative, respectively. The phonon frequency and lattice displacement of the inorganic octahedra are highly dependent on the organic cation. This study injects fresh insights into the exciton–phonon coupling of 2D perovskites relevant for emergent optoelectronics development.
(Less)
- author
- Fu, Jianhui
; Li, Mingjie
; Solanki, Ankur
; Xu, Qiang
; Lekina, Yulia
; Ramesh, Sankaran
LU
; Shen, Ze Xiang
and Sum, Tze Chien
- publishing date
- 2021-03-18
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- coherent optical phonons, deformation potential, exciton–phonon coupling, impulsive stimulated Raman scattering
- in
- Advanced Materials
- volume
- 33
- issue
- 11
- article number
- 2006233
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- pmid:33576093
- scopus:85101036891
- ISSN
- 0935-9648
- DOI
- 10.1002/adma.202006233
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2021 Wiley-VCH GmbH
- id
- 28352f16-2b8e-4302-a451-659a2df49b37
- date added to LUP
- 2023-02-15 22:06:07
- date last changed
- 2024-06-15 02:50:25
@article{28352f16-2b8e-4302-a451-659a2df49b37,
abstract = {{<p>Excitonic effects underpin the fascinating optoelectronic properties of 2D perovskites that are highly favorable for photovoltaics and light-emitting devices. Analogous to switching in transistors, manipulating these excitonic properties in 2D perovskites using coherent phonons could unlock new applications. Presently, a detailed understanding of this underlying mechanism remains modest. Herein, the origins of the carrier-phonon coupling in 2D perovskites using transient absorption (TA) spectroscopy are explicated. The exciton fine structure is modulated by coherent optical phonons dominated by the vibrational motion of the PbI<sub>6</sub> octahedra via deformation potential. Originating from impulsive stimulated Raman scattering, these coherent vibrations manifest as oscillations in the TA spectrum comprising of the generation and detection processes of coherent phonons. This two-step process leads to a unique pump- and probe-energy dependence of the phonon modulation determined by the imaginary part of the refractive index and its derivative, respectively. The phonon frequency and lattice displacement of the inorganic octahedra are highly dependent on the organic cation. This study injects fresh insights into the exciton–phonon coupling of 2D perovskites relevant for emergent optoelectronics development.</p>}},
author = {{Fu, Jianhui and Li, Mingjie and Solanki, Ankur and Xu, Qiang and Lekina, Yulia and Ramesh, Sankaran and Shen, Ze Xiang and Sum, Tze Chien}},
issn = {{0935-9648}},
keywords = {{coherent optical phonons; deformation potential; exciton–phonon coupling; impulsive stimulated Raman scattering}},
language = {{eng}},
month = {{03}},
number = {{11}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Advanced Materials}},
title = {{Electronic States Modulation by Coherent Optical Phonons in 2D Halide Perovskites}},
url = {{http://dx.doi.org/10.1002/adma.202006233}},
doi = {{10.1002/adma.202006233}},
volume = {{33}},
year = {{2021}},
}