Статья

Deciphering the Ultrafast Nonlinear Optical Properties and Dynamics of Pristine and Ni-Doped CsPbBr<sub>3</sub> Colloidal Two-Dimensional Nanocrystals

Ravi KetavathSolar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, IndiaNaga Krishnakanth KatturiAdvanced Center of Research in High Energy Materials (ACRHEM), University of Hyderabad, Prof. C. R. Rao Road, Hyderabad 500046, Telangana, IndiaSachin G. GhugalSolar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, IndiaHema Kumari KolliSolar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, IndiaT. SwethaSolar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, IndiaS. Venugopal RaoAdvanced Center of Research in High Energy Materials (ACRHEM), University of Hyderabad, Prof. C. R. Rao Road, Hyderabad 500046, Telangana, IndiaBanavoth MuraliSolar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad, Telangana 500046, India

2019en

ABI

Аннотация

While the unabated race persists in achieving record efficiencies in solar cells and other photonic/optoelectronic devices using lead halide perovskite absorbers, a comprehensive picture of the correlated third-order nonlinear optical (NLO) properties is yet to be established. The present study is aimed at deciphering the role of dopants in multiphoton absorption properties of intentionally engineered CsPbBr3 colloidal nanocrystals (NCs). The charge separation of the plasmon-semiconductor conduction band owing to the hot electron transfer at the interface was demystified using the dynamics of the bleached spectral data from femtosecond (fs) transient absorption spectroscopy with broadband capabilities. The NLO properties studied through the fs Z-scan technique revealed that Ni-doped CsPbBr3 NCs exhibited strong third-order NLO susceptibility of ∼10–10 esu. The exotic photophysical phenomena in these pristine and Ni-doped CsPbBr3 colloidal two-dimensional (2D) NCs reported herein are believed to provide the avenues to address the critical variables involved in the structural differences and their correlated optoelectronic properties.

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Идентификаторы

DOI: 10.1021/acs.jpclett.9b02244

Цитирования и источники

Цитирований: 3Использованных источников: 0

Показатели — AkademScholar