Colloidal Synthesis and Photophysics of M3 Sb2 I9 (M=Cs and Rb) Nanocrystals: Lead-Free Perovskites

Jaya Pal; Suman Manna; Anirban Mondal; Shyamashis Das; K V Adarsh; Angshuman Nag

doi:10.1002/anie.201709040

Colloidal Synthesis and Photophysics of M₃ Sb₂ I₉ (M=Cs and Rb) Nanocrystals: Lead-Free Perovskites

Angew Chem Int Ed Engl. 2017 Nov 6;56(45):14187-14191. doi: 10.1002/anie.201709040. Epub 2017 Oct 9.

Authors

Jaya Pal¹, Suman Manna¹, Anirban Mondal², Shyamashis Das³, K V Adarsh², Angshuman Nag¹

Affiliations

¹ Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, 411008, India.
² Department of Physics, Indian Institute of Science Education and Research (IISER), Bhopal, 462066, India.
³ Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560012, India.

PMID: 28906065
DOI: 10.1002/anie.201709040

Abstract

Herein we report the colloidal synthesis of Cs₃ Sb₂ I₉ and Rb₃ Sb₂ I₉ perovskite nanocrystals, and explore their potential for optoelectronic applications. Different morphologies, such as nanoplatelets and nanorods of Cs₃ Sb₂ I₉ , and spherical Rb₃ Sb₂ I₉ nanocrystals were prepared. All these samples show band-edge emissions in the yellow-red region. Exciton many-body interactions studied by femtosecond transient absorption spectroscopy of Cs₃ Sb₂ I₉ nanorods reveals characteristic second-derivative-type spectral features, suggesting red-shifted excitons by as much as 79 meV. A high absorption cross-section of ca. 10^-15 cm² was estimated. The results suggest that colloidal Cs₃ Sb₂ I₉ and Rb₃ Sb₂ I₉ nanocrystals are potential candidates for optical and optoelectronic applications in the visible region, though a better control of defect chemistry is required for efficient applications.

Keywords: Cs3Sb2I9; Rb3Sb2I9; colloidal nanocrystals; perovskites; transient absorption spectroscopy.

Publication types

Research Support, Non-U.S. Gov't