Print Email Facebook Twitter Charge Carrier Dynamics in Cs2AgBiBr6 Double Perovskite Title Charge Carrier Dynamics in Cs2AgBiBr6 Double Perovskite Author Bartesaghi, D. (TU Delft ChemE/Opto-electronic Materials; Material Innovation Institute (M2i)) Slavney, Adam H. (Stanford University) Gelvez Rueda, M.C. (TU Delft ChemE/Opto-electronic Materials) Connor, Bridget A. (Stanford University) Grozema, F.C. (TU Delft ChemE/Opto-electronic Materials) Karunadasa, Hemamala I. (Stanford University) Savenije, T.J. (TU Delft ChemE/Opto-electronic Materials) Date 2018 Abstract Double perovskites, comprising two different cations, are potential nontoxic alternatives to lead halide perovskites. Here, we characterized thin films and crystals of Cs2AgBiBr6 by time-resolved microwave conductance (TRMC), which probes formation and decay of mobile charges upon pulsed irradiation. Optical excitation of films results in the formation of charges with a yield times mobility product, φΣμ > 1 cm2/Vs. On excitation of millimeter-sized crystals, the TRMC signals show, apart from a fast decay, a long-lived tail. Interestingly, this tail is dominant when exciting close to the bandgap, implying the presence of mobile charges with microsecond lifetimes. From the temperature and intensity dependence of the TRMC signals, we deduce a shallow trap state density of around 1016/cm3 in the bulk of the crystal. Despite this high concentration, trap-assisted recombination of charges in the bulk appears to be slow, which is promising for photovoltaic applications. To reference this document use: http://resolver.tudelft.nl/uuid:f559ca47-3190-423d-954d-4b007d6417dc DOI https://doi.org/10.1021/acs.jpcc.8b00572 ISSN 1932-7447 Source The Journal of Physical Chemistry C, 122 (9), 4809-4816 Part of collection Institutional Repository Document type journal article Rights © 2018 D. Bartesaghi, Adam H. Slavney, M.C. Gelvez Rueda, Bridget A. Connor, F.C. Grozema, Hemamala I. Karunadasa, T.J. Savenije Files PDF acs.jpcc.8b00572.pdf 1.56 MB Close viewer /islandora/object/uuid:f559ca47-3190-423d-954d-4b007d6417dc/datastream/OBJ/view