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.
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): OCRF-2014-CRG3-2268
Acknowledgements: PVK acknowledges support by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy (award DE-FC02-04ER15533). RS acknowledges support of King Abdullah University of Science and Technology (KAUST-Award OCRF-2014-CRG3-2268). This collaborative research received funding from the European Research Council (ERC) under the EU’s Horizon 2020 research and innovation program (GFS and CJ, grant agreement No 716539). ELIALPS is supported by the EU and co-financed by the European Regional Development Fund (GOP-1.1.1-12/B-2012-000, GINOP-2.3.6-15-2015-00001). This is contribution number NDRL No.5191 from the Notre Dame Radiation Laboratory.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.