Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 45, Pages 14187-14191Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201709040
Keywords
colloidal nanocrystals; Cs3Sb2I9; perovskites; Rb3Sb2I9; transient absorption spectroscopy
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Funding
- SERB [SR/S2/RJN-61/2012]
- DST Nano Mission Thematic Unit, Govt of India
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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 cm(2) 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.
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