Colloidal Synthesis and Photophysics of M3Sb2I9 (M=Cs and Rb) Nanocrystals: Lead‐Free Perovskites

Herein we report the colloidal synthesis of Cs3Sb2I9 and Rb3Sb2I9 perovskite nanocrystals, and explore their potential for optoelectronic applications. Different morphologies, such as nanoplatelets and nanorods of Cs3Sb2I9, and spherical Rb3Sb2I9 nanocrystals were prepared. All these samples show ba...

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Published inAngewandte Chemie International Edition Vol. 56; no. 45; pp. 14187 - 14191
Main Authors Pal, Jaya, Manna, Suman, Mondal, Anirban, Das, Shyamashis, Adarsh, K. V., Nag, Angshuman
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 06.11.2017
EditionInternational ed. in English
Subjects
Absorption cross sections
Absorption spectroscopy
colloidal nanocrystals
Colloids
Crystals
Cs3Sb2I9
Excitons
Lead
Lead free
Many body problem
Nanocrystals
Nanorods
Optoelectronics
Perovskites
Rb3Sb2I9
Spectroscopy
Synthesis
transient absorption spectroscopy
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Summary:Herein we report the colloidal synthesis of Cs3Sb2I9 and Rb3Sb2I9 perovskite nanocrystals, and explore their potential for optoelectronic applications. Different morphologies, such as nanoplatelets and nanorods of Cs3Sb2I9, and spherical Rb3Sb2I9 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 Cs3Sb2I9 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 Cs3Sb2I9 and Rb3Sb2I9 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. Lead astray: Colloidal nanocrystals of Cs3Sb2I9 and Rb3Sb2I9 perovskites with different shapes (sphere, rod, platelet) were prepared and show excitonic absorption (high cross‐section ca. 10−15 cm2) and emission in the red–yellow region. Exciton many‐body interactions were studied using femtosecond transient absorption spectroscopy. The Sb‐halide nanocrystals show potential as Pb‐free optoelectronic material.
Bibliography:These authors contributed equally to this work.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201709040