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Decoding Ultrafast Polarization Responses in Lead Halide Perovskites by the Two-Dimensional Optical Kerr Effect by Maehrlein, Sebastian F.; Joshi, Prakriti P.; Huber, Lucas; Wang, Feifan; Cherasse, Marie; Liu, Yufeng; Juraschek, Dominik M.; Mosconi, Edoardo; Meggiolaro, Daniele; de Angelis, Filippo; Zhu, X. -Y. is a scholarly article available to read on EtoBox.

What is Decoding Ultrafast Polarization Responses in Lead Halide Perovskites by the Two-Dimensional Optical Kerr Effect about?

The ultrafast polarization response to incident light and ensuing exciton/carrier generation are essential to outstanding optoelectronic properties of lead halide perovskites (LHPs). A large number of mechanistic studies in the LHP field to date have focused on contributions to polarizability from organic cations and the highly polarizable inorganic lattice. For a comprehensive understanding of the ultrafast polarization response, we must additionally account for the nearly instantaneous hyperpolarizability response to the propagating light field itself. While light propagation is pivotal to optoelectronics and photonics, little is known about this in LHPs in the vicinity of the bandgap where stimulated emission, polariton condensation, superfluorescence, and photon recycling may take place. Here we develop two-dimensional optical Kerr effect (2D-OKE) spectroscopy to energetically dissect broadband light propagation and dispersive nonlinear polarization responses in LHPs. In contrast to earlier interpretations, the below-bandgap OKE responses in both hybrid CH3NH3PbBr3 and all-inorganic CsPbBr3 perovskites are found to originate from strong hyperpolarizability and highly anisotropi

Author
Maehrlein, Sebastian F.; Joshi, Prakriti P.; Huber, Lucas; Wang, Feifan; Cherasse, Marie; Liu, Yufeng; Juraschek, Dominik M.; Mosconi, Edoardo; Meggiolaro, Daniele; de Angelis, Filippo; Zhu, X. -Y.
Published
2020
Language
EN

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