Haris Muhammed P U, Xia Jianxing, Kazim Samrana, Molenda Zuzanna, Hirsch Lionel, Buffeteau Thierry, Bassani Dario M, Nazeeruddin Mohammad Khaja, Ahmad Shahzada
BCMaterials, Basque Center for Materials, Applications, and Nanostructures, UPV/EHU, Science Park, 48940 Leioa, Spain.
Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Valais Wallis, Rue de l'Industrie 17, 1950 Sion, Switzerland.
Cell Rep Phys Sci. 2023 Mar 15;4(3):101304. doi: 10.1016/j.xcrp.2023.101304.
Formamidinium lead iodide-based solar cells show promising device reliability. The grain imperfection can be further suppressed by developing powder methodology. The water uptake capability is critical for the stability of α-formamidinium lead triiodide (FAPbI) thin films, and elucidating the migration of hydrogen species is challenging using routine techniques such as imaging or mass spectroscopy. Here, we decipher the proton diffusion to quantify indirect monitoring of H migration by following the N-D vibration using transmission infrared spectroscopy. The technique allows a direct assessment of the perovskite degradation associated with moisture. The inclusion of Cs in FAPbI, reveals significant differences in proton diffusion rates, attesting to its impact. CsFAPbI's ability to block the active layer access by water molecules is five times higher than α-FAPbI which is significantly higher than methylammonium lead triiodide (MAPbI). Our protocol directly probes the local environment of the material to identify its intrinsic degradation mechanisms and stability, a key requirement for optoelectronic applications.
基于碘化甲脒铅的太阳能电池显示出良好的器件可靠性。通过开发粉末方法可以进一步抑制晶粒缺陷。吸水能力对于α-碘化甲脒铅（FAPbI）薄膜的稳定性至关重要，而使用成像或质谱等常规技术来阐明氢物种的迁移具有挑战性。在这里，我们通过透射红外光谱跟踪N-D振动来破译质子扩散，以量化对H迁移的间接监测。该技术可以直接评估与水分相关的钙钛矿降解。在FAPbI中加入Cs，揭示了质子扩散速率的显著差异，证明了其影响。CsFAPbI阻止水分子进入活性层的能力比α-FAPbI高五倍，这明显高于碘化甲脒铅（MAPbI）。我们的方案直接探测材料的局部环境，以确定其内在降解机制和稳定性，这是光电子应用的关键要求。
