Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/147128
Title: Electronic states modulation by coherent optical phonons in 2D halide perovskites
Authors: Fu, Jianhui
Li, Mingjie
Solanki, Ankur
Xu, Qiang
Lekina, Yulia
Ramesh, Sankaran
Shen, Ze Xiang
Sum, Tze Chien
Keywords: Science::Physics::Optics and light
Engineering::Materials::Energy materials
Issue Date: 2021
Source: Fu, J., Li, M., Solanki, A., Xu, Q., Lekina, Y., Ramesh, S., Shen, Z. X. & Sum, T. C. (2021). Electronic states modulation by coherent optical phonons in 2D halide perovskites. Advanced Materials, 33(11), e2006233-. https://dx.doi.org/10.1002/adma.202006233
Project: NTU Start-up Grant M4080514 
AcRF Tier 1 grant (RG91/19)
MOE2017-T2-2-002
MOE2019-T2-1-006
MOE2019-T2-1-097
NRFI-2018-04
AcRF Tier 1 (RG195/17)
AcRF Tier 1 (RG156/19)
MOE2016-T3-1-006 (S)
Journal: Advanced Materials
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 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.
URI: https://hdl.handle.net/10356/147128
ISSN: 0935-9648
DOI: 10.1002/adma.202006233
Rights: This is the peer reviewed version of the following article: Fu, J., Li, M., Solanki, A., Xu, Q., Lekina, Y., Ramesh, S., Shen, Z. X. & Sum, T. C. (2021). Electronic states modulation by coherent optical phonons in 2D halide perovskites. Advanced Materials, 33(11), e2006233-. https://dx.doi.org/10.1002/adma.202006233, which has been published in final form at https://doi.org/10.1002/adma.202006233. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: embargo_20220318
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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