Open AccessModulation of Charge Recombination in CsPbBr3 Perovskite Films with Electrochemical Bias
Author(s) -
Rebecca A. Scheidt,
Gergely F. Samu,
Csaba Janáky,
Prashant V. Kamat
Publication year - 2017
Publication title -
journal of the american chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.115
H-Index - 612
eISSN - 1520-5126
pISSN - 0002-7863
DOI - 10.1021/jacs.7b10958
Subject(s) - perovskite (structure) , chemistry , mesoscopic physics , charge carrier , ultrafast laser spectroscopy , perovskite solar cell , halide , optoelectronics , nanosecond , solar cell , biasing , spectroscopy , chemical physics , analytical chemistry (journal) , inorganic chemistry , optics , voltage , condensed matter physics , materials science , laser , crystallography , physics , quantum mechanics , chromatography
The charging of a mesoscopic TiO 2 layer in a metal halide perovskite solar cell can influence the overall power conversion efficiency. By employing CsPbBr 3 films deposited on a mesoscopic TiO 2 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 CsPbBr 3 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.
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