Influence of molecular linkers on photoinduced charge transfer dynamics in CsPbBr3-CdSe nanoplatelet hybrids
SWAYANDIPTA DEY a, MIRI KAZES a, HAGAI COHEN b, IDDO PINKAS b, DAN ORON a
a Department of Physics of Complex Systems, Weizmann Institute of Science, Herzl Street, 234, Rehovot, Israel
b Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, Israel
nanoGe Perovskite Conferences
Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
International Conference on Perovskite Photonics and Optoelectronics
Jerusalem, Israel, 2019 February 24th - 27th
Organizers: Lioz Etgar and Paul Meredith
Oral, SWAYANDIPTA DEY, presentation 018
DOI: https://doi.org/10.29363/nanoge.nipho.2019.018
Publication date: 21st November 2018

Electronically coupled systems constructed out of recently developed Lead halide based Perovskite nanocrystals and Quantum dots could be prospective smart hybrid materials for next generation photovoltaic and optoelectronic devices due to their mutually synergistic interactions. In our present work, we have studied the nature of electronic coupling and photoinduced charge transfer dynamics occurring in CsPbBr3-CdSe nanoplatelet hybrid system being cross-linked with various short chain aliphatic (Glycine) and aromatic (p-Aminobenzoic acid) molecular linkers. Combining time-resolved photoluminescence spectroscopy and transient absorption measurements in correlation with in-situ photoresponse X-ray photoelectron spectroscopy, we provide comprehensive information on the effect of charge distribution modifications, realignment of band edge potentials and subsequent change in exciton binding energy in our hybrid films. These hybrid systems generated an effective p-n heterojunction due to the charge distribution with a built in electric field as controlled by the molecular linkers across the interface between these two disparate materials. Our results demonstrate the pivotal role taken by organic linkers in such hybrid assemblies, and shed new light on past results on perovskite-QD hybrid systems. As such, it establishes new insight on hybrid heterojunctions with potential applications in the design of hybrid devices.

Israel Science Foundation ISF‐NSFC program

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