Impact of Moisture on Mobility in Methylammonium Lead Iodide and Formamidinium Lead Iodide.,The Journal of Physical Chemistry Letters

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Impact of Moisture on Mobility in Methylammonium Lead Iodide and Formamidinium Lead Iodide.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-06-11 , DOI: 10.1021/acs.jpclett.0c01369
Min Ji Hong ₁ , Rose Y Johnson ₂ , John G Labram ₁

Affiliation

The greatest remaining barrier to the commercialization of perovskite solar cells is their instability to ambient environmental conditions. While most studies of the electronic stability of perovskites employ finished devices, we here exploit the contactless characterization technique time-resolved microwave conductivity to probe electronic properties in the absence of encapsulation and interface effects. By tracking the mobility of charge carriers in two archetypal perovskite compounds, methylammonium lead iodide (MAPbI₃) and formamidinium lead iodide (FAPbI₃) under various conditions, we are able to make decisive statements about the role of water in the electronic performance of perovskites. Overall, we observe a strong negative correlation between hydration and mobility in MAPbI₃, but not in FAPbI₃. We anticipate that the data presented herein will serve as a valuable resource in future stability studies in perovskite solar cells and, ultimately, lead to more stable devices.

中文翻译：

水分对甲基铵碘化铅和甲酰胺碘化铅中迁移率的影响。

钙钛矿太阳能电池商业化的最大障碍是其对周围环境条件的不稳定性。虽然大多数钙钛矿电子稳定性的研究都采用了成品器件，但我们在这里利用非接触式表征技术，通过时间分辨的微波电导率来探测在没有封装和界面效应的情况下的电子性能。通过跟踪两种原型钙钛矿化合物（甲基铵碘化铅（MAPbI ₃）和甲铵碘化铅（FAPbI ₃））在各种条件下的载流子迁移率，我们能够对水在钙钛矿的电子性能中的作用做出决定性的陈述。总体而言，我们观察到MAPbI中的水合作用和流动性之间存在强烈的负相关性₃，但不是FAPbI ₃。我们预计，本文提供的数据将成为钙钛矿型太阳能电池未来稳定性研究中的宝贵资源，并最终导致更稳定的设备。

更新日期：2020-07-02

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