Temperature Dependent Charge Carrier Dynamics in Formamidinium Lead Iodide Perovskite,The Journal of Physical Chemistry C

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Temperature Dependent Charge Carrier Dynamics in Formamidinium Lead Iodide Perovskite
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-10-11 00:00:00 , DOI: 10.1021/acs.jpcc.7b09303
María C. Gélvez-Rueda ₁ , Nicolas Renaud ₁ , Ferdinand C. Grozema ₁

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The fundamental opto-electronic properties of organic–inorganic hybrid perovskites are strongly affected by their structural parameters. These parameters are particularly critical in formamidinium lead iodide (FAPbI₃), in which its large structural disorder leads to a non-perovskite yellow phase that hinders its photovoltaic performance. A clear understanding of how the structural parameters affect the opto-electronic properties is currently lacking. We have studied the opto-electronic properties of FAPbI₃ using microwave conductivity measurements. We find that the mobility of FAPbI₃ increases at low temperature following a phonon scattering behavior. Unlike methylammonium lead iodide (MAPbI₃), there are no abrupt changes after the low-temperature β/γ phase transition and the lifetime is remarkably long. This absence of abrupt changes can be understood in terms of the reduced rotational freedom and smaller dipole moment of the formamidinium, as compared to methylammonium.

中文翻译：

甲ami碘化钙钛矿中随温度变化的电荷载流子动力学

有机-无机杂化钙钛矿的基本光电性能受其结构参数的强烈影响。这些参数在甲ami碘化铅（FAPbI ₃）中尤为关键，在碘化铅中，其较大的结构紊乱会导致非钙钛矿黄相，从而阻碍其光伏性能。当前缺乏对结构参数如何影响光电特性的清晰理解。我们已经使用微波电导率测量研究了FAPbI ₃的光电特性。我们发现，FAPbI ₃的迁移率随着声子的散射行为在低温下增加。与甲基铵碘化铅（MAPbI ₃），低温β/γ相变后没有突然变化，并且使用寿命非常长。与甲铵相比，可以通过减少甲酰胺鎓的旋转自由度和较小偶极矩来理解这种突然变化的现象。

更新日期：2017-10-12

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