Print Email Facebook Twitter Tuning the Driving Force for Charge Transfer in Perovskite-Chromophore Systems Title Tuning the Driving Force for Charge Transfer in Perovskite-Chromophore Systems Author Wei, Z. (TU Delft ChemE/Opto-electronic Materials) Mulder, J.T. (TU Delft ChemE/Opto-electronic Materials) Dubey, R. (TU Delft ChemE/Opto-electronic Materials) Evers, W.H. (TU Delft BN/Afdelingsbureau) Jager, W.F. (TU Delft ChemE/Advanced Soft Matter) Houtepen, A.J. (TU Delft ChemE/Opto-electronic Materials) Grozema, F.C. (TU Delft ChemE/Opto-electronic Materials) Date 2023 Abstract Understanding the interplay between the kinetics and energetics of photophysical processes in perovskite-chromophore hybrid systems is crucial for realizing their potential in optoelectronics, photocatalysis, and light-harvesting applications. By combining steady-state optical characterizations and transient absorption spectroscopy, we have investigated the mechanism of interfacial charge transfer (CT) between colloidal CsPbBr3 nanoplatelets (NPLs) and surface-anchored perylene derivatives and have explored the possibility of controlling the CT rate by tuning the driving force. The CT driving force was tuned systematically by attaching acceptors with different electron affinities and by varying the bandgap of NPLs via thickness-controlled quantum confinement. Our data show that the charge-separated state is formed by selectively exciting either the electron donors or acceptors in the same system. Upon exciting attached acceptors, hole transfer from perylene derivatives to CsPbBr3 NPLs takes place on a picosecond time scale, showing an energetic behavior in line with the Marcus normal regime. Interestingly, such energetic behavior is absent upon exciting the electron donor, suggesting that the dominant CT mechanism is energy transfer followed by ultrafast hole transfer. Our findings not only elucidate the photophysics of perovskite-molecule systems but also provide guidelines for tailoring such hybrid systems for specific applications. To reference this document use: http://resolver.tudelft.nl/uuid:3bc42b38-682b-42d4-a565-9dd6a2032582 DOI https://doi.org/10.1021/acs.jpcc.3c03815 ISSN 1932-7447 Source The Journal of Physical Chemistry C, 127 (31), 15406-15415 Part of collection Institutional Repository Document type journal article Rights © 2023 Z. Wei, J.T. Mulder, R. Dubey, W.H. Evers, W.F. Jager, A.J. Houtepen, F.C. Grozema Files PDF acs.jpcc.3c03815.pdf 4.27 MB Close viewer /islandora/object/uuid:3bc42b38-682b-42d4-a565-9dd6a2032582/datastream/OBJ/view