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Pyridination of hole transporting material in perovskite solar cells questions the long-term stability

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Abstract

In this work, for the first time, reactive radical-cation species present in hole-transporting materials were shown to react with tert-butylpyridine additive, routinely used in hole transporting layer composition. As a result, new pyridinated products were isolated and characterized by NMR and MS analysis. Additionally, their optical and photophysical properties (i.e., solid-state ionization potentials (Ip), cyclic voltammetry (CV), UV/vis characteristics, and conductivities) were determined. Formation of the pyridinated products was confirmed in the aged perovskite solar cells by means of mass spectrometry, and shown to have negative influence on the overall device performance. We believe that these findings will help improve the stability of perovskite devices by either molecular engineering of hole-transporting materials or utilization of less-reactive or sterically hindered pyridine derivatives.

Graphical abstract: Pyridination of hole transporting material in perovskite solar cells questions the long-term stability

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Publication details

The article was received on 09 May 2018, accepted on 10 Jul 2018 and first published on 12 Jul 2018


Article type: Communication
DOI: 10.1039/C8TC02242A
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Pyridination of hole transporting material in perovskite solar cells questions the long-term stability

    A. Magomedov, E. Kasparavičius, K. Rakstys, S. Paek, N. Gasilova, K. Genevičius, G. Juška, T. Malinauskas, M. K. Nazeeruddin and V. Getautis, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC02242A

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