Overcoming the exciton binding energy in two-dimensional perovskite nanoplatelets by attachment of conjugated organic chromophores

María C. Gélvez-Rueda, Magnus B. Fridriksson, Rajeev K. Dubey, Wolter F. Jager, Ward van der Stam and Ferdinand C. Grozema ()
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María C. Gélvez-Rueda: Delft University of Technology
Magnus B. Fridriksson: Delft University of Technology
Rajeev K. Dubey: Delft University of Technology
Wolter F. Jager: Delft University of Technology
Ward van der Stam: Delft University of Technology
Ferdinand C. Grozema: Delft University of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract In this work we demonstrate a novel approach to achieve efficient charge separation in dimensionally and dielectrically confined two-dimensional perovskite materials. Two-dimensional perovskites generally exhibit large exciton binding energies that limit their application in optoelectronic devices that require charge separation such as solar cells, photo-detectors and in photo-catalysis. Here, we show that by incorporating a strongly electron accepting moiety, perylene diimide organic chromophores, on the surface of the two-dimensional perovskite nanoplatelets it is possible to achieve efficient formation of mobile free charge carriers. These free charge carriers are generated with ten times higher yield and lifetimes of tens of microseconds, which is two orders of magnitude longer than without the peryline diimide acceptor. This opens a novel synergistic approach, where the inorganic perovskite layers are combined with functional organic chromophores in the same material to tune the properties for specific applications.

Date: 2020
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DOI: 10.1038/s41467-020-15869-7

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