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Modulation of Charge Recombination in CsPbBr3 Perovskite Films with Electrochemical Bias
- Scheidt, Rebecca A., Samu, Gergely F., Janáky, Csaba, Kamat, Prashant V.
- Journal of the American Chemical Society 2018 v.140 no.1 pp. 86-89
- electrochemistry, silver, silver chloride, solar cells, spectroscopy, titanium dioxide
- The charging of a 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 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.