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Quantification of ion migration in CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> perovskite solar cells by transient capacitance measurements

Quantification of ion migration in CH3NH3PbI3 perovskite solar cells by transient capacitance measurements

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FUTSCHER, Moritz H., Ju Min LEE, Lucie MCGOVERN, Loreta A. MUSCARELLA, Tianyi WANG, Muhammad Irfan HAIDER, Azhar FAKHARUDDIN, Lukas SCHMIDT-MENDE, Bruno EHRLER, 2019. Quantification of ion migration in CH3NH3PbI3 perovskite solar cells by transient capacitance measurements. In: Materials Horizons. 6(7), pp. 1497-1503. ISSN 2051-6347. eISSN 2051-6355. Available under: doi: 10.1039/C9MH00445A

@article{Futscher2019-08-12Quant-46800, title={Quantification of ion migration in CH3NH3PbI3 perovskite solar cells by transient capacitance measurements}, year={2019}, doi={10.1039/C9MH00445A}, number={7}, volume={6}, issn={2051-6347}, journal={Materials Horizons}, pages={1497--1503}, author={Futscher, Moritz H. and Lee, Ju Min and McGovern, Lucie and Muscarella, Loreta A. and Wang, Tianyi and Haider, Muhammad Irfan and Fakharuddin, Azhar and Schmidt-Mende, Lukas and Ehrler, Bruno} }

McGovern, Lucie McGovern, Lucie Ion migration in halide perovskite films leads to device degradation and impedes large scale commercial applications. We use transient ion-drift measurements to quantify activation energy, diffusion coefficient, and concentration of mobile ions in methylammonium lead triiodide (MAPbI<sub>3</sub>) perovskite solar cells, and find that their properties change close to the tetragonal-to-orthorhombic phase transition temperature. We identify three migrating ion species which we attribute to the migration of iodide (I<sup>−</sup>) and methylammonium (MA<sup>+</sup>). We find that the concentration of mobile MA<sup>+</sup> ions is one order of magnitude higher than the one of mobile I<sup>−</sup> ions, and that the diffusion coefficient of mobile MA<sup>+</sup> ions is three orders of magnitude lower than the one for mobile I− ions in our samples. This quantification of mobile ions in MAPbI<sub>3</sub> will lead to a better understanding of ion migration and its role in operation and degradation of perovskite solar cells. Quantification of ion migration in CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> perovskite solar cells by transient capacitance measurements Schmidt-Mende, Lukas eng terms-of-use Muscarella, Loreta A. Futscher, Moritz H. Schmidt-Mende, Lukas Fakharuddin, Azhar Lee, Ju Min 2019-09-05T12:41:02Z Haider, Muhammad Irfan Futscher, Moritz H. Wang, Tianyi Ehrler, Bruno Wang, Tianyi Fakharuddin, Azhar Ehrler, Bruno 2019-08-12 Muscarella, Loreta A. Haider, Muhammad Irfan 2019-09-05T12:41:02Z Lee, Ju Min

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