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| TITLE | Interfacial Passivation for Enhanced Moisture Stability of Perovskite Solar Cells: Ammonium or Sulfonium? |
|---|---|
| AUTHOR | Oscar Telschow, Angelika Wrzesi´ nska-Lashkova, Shivam Singh, Vladimir Shilovskikh, Fulya Koc, Jianan Li, L. Andrés Guerrero-León, Boris Rivkin, Bernd Plietker, and Yana Vaynzof* |
| YEAR | 2025 |
| JOURNAL | Advanced Materials Interfaces |
| ABSTRACT | Following the remarkable advances in the performance of metal halide perovskite solar cells, recent research efforts have focused more on enhancing their long-term stability. Among the various factors that impact the device’s lifetime, humidity-driven degradation plays an important role and can significantly lower the device performance within hours. It is generally considered that humidity-induced degradation proceeds via the formation of hydrogen bonds between the water molecules and the nitrogen atoms in widely used ammonium-based organic cations like methylammonium (MA) and formamidinium (FA). To mitigate this process, it has been suggested that an interfacial passivation using sulfonium– rather than the ubiquitously used ammonium– cations may enhance the device stability against moisture. This work explores the impact of a dual interfacial modification by sulfonium- and sulfoxonium-based cations versus two commonly used ammonium-based ones. By examining the interfaces using optical spectroscopy and electron microscopy and evaluating the performance and stability of the devices, it is demonstrated that sulfonium- and sulfoxonium-based cations do not offer a significant advantage over ammonium-based cations, with the latter leading to enhanced stability only in certain cases. |
| FULL ARTICLE | https://advanced.onlinelibrary.wiley.com/doi/pdfdirect/10.1002/admi.202400956 |
| INSTRUMENT | V-770 |
| KEYWORDS | butylammonium iodide, interfacial modification, metal halide perovskite, moisture stability, phenethylammonium iodide, trimethylsulfonium io dide, trimethylsulfoxonium iodide |
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