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Title: | Inducing Charge Separation in Solid-State Two-Dimensional Hybrid Perovskites through the Incorporation of Organic Charge-Transfer Complexes | Authors: | Gélvez-Rueda, María C. VAN GOMPEL, Wouter HERCKENS, Roald LUTSEN, Laurence VANDERZANDE, Dirk Grozema, Ferdinand C. |
Issue Date: | 2020 | Publisher: | AMER CHEMICAL SOC | Source: | The journal of physical chemistry letters, 11 , p. 824 -830 | Abstract: | Two-dimensional (2D) hybrid perovskites make up an emerging class of materials for optoelectronic applications in which inorganic octahedral layers are separated by nonconductive large organic cations. This leads to a high-dimensional and dielectric confinement and hence a high exciton binding energy, which severely limits their application in devices in which charge carrier separation is required. In this work, we achieve improved charge separation by replacing nonconductive organic cations with organic charge-transfer complexes consisting of a pyrene donor and a tetracyanoquinodimethane acceptor. Steady-state absorption measurements show that these materials exhibit optical features that match with the absorption of the organic charge-transfer complexes. Using microwave conductivity and femtosecond transient absorption, we show that photoexcitation of these charge-transfer states leads to long-lived mobile charges in the inorganic layers. While the efficiency of charge separation is relatively low, these experiments demonstrate that it is possible to induce charge separation in solid-state 2D perovskites by engineering the organic layer. | Notes: | Grozema, FC (reprint author), Delft Univ Technol, Delft, Netherlands. F.C.Grozema@tudelft.nl |
Document URI: | http://hdl.handle.net/1942/30411 | ISSN: | 1948-7185 | DOI: | 10.1021/acs.jpclett.9b03746 | ISI #: | WOS:000512223400034 | Rights: | This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License, which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2021 |
Appears in Collections: | Research publications |
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acs.jpclett.9b03746.pdf | Published version | 1.81 MB | Adobe PDF | View/Open |
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