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Electronic States Modulation by Coherent Optical Phonons in 2D Halide Perovskites
Jianhui Fu1, Mingjie Li2, Ankur Solanki1,3
1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
Advanced Materials (Deerfield Beach, Fla.)
|February 12, 2021
Summary
Researchers explored how coherent phonons influence excitonic effects in 2D perovskites. This study reveals insights into carrier-phonon coupling, crucial for developing advanced optoelectronic devices like solar cells and LEDs.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spectroscopy
Background:
- Excitonic effects in 2D perovskites are key to their optoelectronic properties for devices.
- Understanding carrier-phonon coupling is crucial for manipulating these properties.
Purpose of the Study:
- To elucidate the origins of carrier-phonon coupling in 2D perovskites.
- To investigate the modulation of exciton fine structure by coherent optical phonons.
Main Methods:
- Transient absorption (TA) spectroscopy was employed to study carrier-phonon interactions.
- Impulsive stimulated Raman scattering was identified as the source of coherent vibrations.
Main Results:
- Coherent optical phonons, primarily from PbI6 octahedra vibrations, modulate the exciton fine structure via deformation potential.
- The pump- and probe-energy dependence of phonon modulation was observed.
- Phonon properties are significantly influenced by the organic cation in 2D perovskites.
Conclusions:
- This work provides novel insights into exciton-phonon coupling in 2D perovskites.
- Findings are relevant for the advancement of 2D perovskite-based optoelectronics.
