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Direct Experimental Evidence of Halide IonicMigration under Bias in CH3NH3Pbl3 et 8722;xClxet8209;BasedPerovskite Solar Cells Using GD-OES Analysis

Abstract : In recent decades, the development oforganicet8722;inorganic hybrid perovskite solar cells (PSCs)has been increasing very quickly due to their high initialefficiency and low-cost process. However, key points suchas crystal growth mechanisms, currentet8722;voltage hysteresis,and instability remain still unexplained or misunderstood.Among several possibilities, ionic migration in PSCs hasbeen suggested to explain the hysteresis effect. However,direct experimental evidence of ionic migration underoperation or measurement conditions of PSCs is stillmissing. This work shows directly the ionic migration ofhalogen components (Iet8722; and Clet8722;) of a CH3NH3PbI3et8722;xClx perovskite film under an applied bias using glow dischargeoptical emission spectrometry (GD-OES). Furthermore, no migration of lead and nitrogen ions is observed on apolarization time scale less than 2 min. The ratio of fixed to mobile iodide ions is deduced from the evolution of the GDOESprofile lines as a function of the applied bias. The average length of iodide and chloride ion migration is deduced fromthe experimental results.
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https://hal-cea.archives-ouvertes.fr/cea-02339917
Contributor : Bibliothèque Cadarache <>
Submitted on : Wednesday, October 30, 2019 - 3:44:29 PM
Last modification on : Thursday, March 19, 2020 - 5:27:19 PM

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  • HAL Id : cea-02339917, version 1

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S. Gaiaschi, P. Chapon, A. Marronnier, H. Lee, Jc. Vanel, et al.. Direct Experimental Evidence of Halide IonicMigration under Bias in CH3NH3Pbl3 et 8722;xClxet8209;BasedPerovskite Solar Cells Using GD-OES Analysis. ACS Energy Letters, American Chemical Society 2017, 2. ⟨cea-02339917⟩

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