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

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2019
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Futscher, Moritz H.
Lee, Ju Min
McGovern, Lucie
Muscarella, Loreta A.
Wang, Tianyi
Ehrler, Bruno
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Materials Horizons. 2019, 6(7), pp. 1497-1503. ISSN 2051-6347. eISSN 2051-6355. Available under: doi: 10.1039/C9MH00445A
Zusammenfassung

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 (MAPbI3) 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) and methylammonium (MA+). We find that the concentration of mobile MA+ ions is one order of magnitude higher than the one of mobile I ions, and that the diffusion coefficient of mobile MA+ ions is three orders of magnitude lower than the one for mobile I− ions in our samples. This quantification of mobile ions in MAPbI3 will lead to a better understanding of ion migration and its role in operation and degradation of perovskite solar cells.

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ISO 690FUTSCHER, 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. 2019, 6(7), pp. 1497-1503. ISSN 2051-6347. eISSN 2051-6355. Available under: doi: 10.1039/C9MH00445A
BibTex
@article{Futscher2019-08-12Quant-46800,
  year={2019},
  doi={10.1039/C9MH00445A},
  title={Quantification of ion migration in CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> perovskite solar cells by transient capacitance measurements},
  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}
}
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