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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
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Ultrafast All-Optical Modulation in 2D Hybrid Perovskites
Gustavo Grinblat1, Ibrahim Abdelwahab1,2,3, Michael P Nielsen1,4
1The Blackett Laboratory, Department of Physics , Imperial College London , London SW7 2AZ , United Kingdom.
ACS Nano
|July 18, 2019
Summary
Two-dimensional Ruddlesden-Popper perovskites (RPPs) show significant nonlinear optical properties. These 2D RPPs demonstrate potential as ultrafast nanoscale all-optical modulators for advanced computing and data transmission.
Area of Science:
- Materials Science
- Optics
- Condensed Matter Physics
Background:
- Two-dimensional (2D) hybrid organic-inorganic Ruddlesden-Popper perovskites (RPPs) possess strong excitonic effects in their quantum wells.
- These properties suggest potential for large nonlinear optical (NLO) responses.
Purpose of the Study:
- Investigate the influence of nonlinear effects on the ultrafast dynamics of 2D RPP thin flakes.
- Evaluate 2D RPPs as nanoscale all-optical modulators.
Main Methods:
- Utilized nondegenerate pump-probe spectroscopy.
- Operated within the 600-1000 nm wavelength range.
- Studied thin flakes of 2D RPPs.
Main Results:
- Achieved ~2% reflectivity modulation within 20 fs under sub-bandgap excitation via nonlinear optical Kerr effect and two-photon absorption.
- Demonstrated NLO performance ~5 times greater than photonic metasurfaces and nanoantennas.
- Observed loss of ultrafast response under resonant excitation due to linear absorption and free carrier generation.
Conclusions:
- 2D RPPs exhibit significant ultrafast nonlinear optical properties.
- These materials show promise for nanoscale all-optical modulators in the visible/near-infrared spectrum.
- Potential applications include ultrafast information processing, optical data transmission, and high-performance computing.
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