Charge Carrier Dynamics in Cs2AgBiBr6 Double Perovskite

Davide Bartesaghi, Adam H. Slavney, María C. Gélvez-Rueda, Bridget A. Connor, Ferdinand C. Grozema, Hemamala I. Karunadasa, Tom J. Savenije

Research output: Contribution to journalArticleScientificpeer-review

50 Citations (Scopus)
29 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)4809-4816
JournalJournal of Physical Chemistry C
Volume122
Issue number9
DOIs
Publication statusPublished - 2018

Fingerprint Dive into the research topics of 'Charge Carrier Dynamics in Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite'. Together they form a unique fingerprint.

Cite this