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

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 lessreactive or sterically hindered pyridine derivatives.


Publié dans:
Journal Of Materials Chemistry C, 6, 33, 8874-8878
Année
Sep 07 2018
Publisher:
Cambridge, ROYAL SOC CHEMISTRY
ISSN:
2050-7526
2050-7534
Mots-clefs:
Laboratoires:




 Notice créée le 2018-12-13, modifiée le 2019-06-19


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