Modulation of Charge Recombination in CsPbBr3 Perovskite Films with Electrochemical Bias

Rebecca A Scheidt, Gergely F. Samu, Csaba Janáky, Prashant V. Kamat

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The charging of mesoscopic TiO2 layer in a metal halide perovskite solar cell can influence the overall power conversion efficiency. By employing CsPbBr3 films deposited on a mesoscopic TiO2 film, we have succeeded in probing the influence of electrochemical bias on the charge carrier recombination process. The transient absorption spectroscopy experiments conducted at different applied potentials indicate a decrease in the charge carrier lifetimes of CsPbBr3 as we increase the potential from -0.6 V to + 0.6 V vs. Ag/AgCl. The charge carrier lifetime increased upon reversing the applied bias, thus indicating the reversibility of the photoresponse to charging effects. The ultrafast spectroelectrochemical experiments described here offer a convenient approach to probe the charging effects in perovskite solar cells.
Original languageEnglish (US)
Pages (from-to)86-89
Number of pages4
JournalJournal of the American Chemical Society
Volume140
Issue number1
DOIs
StatePublished - Nov 21 2017
Externally publishedYes

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