This work analyzes in detail the effect of ferroelectric polarization patterns in methylammonium lead iodide (MAPbI₃) thin-films on the J-V characteristics of the corresponding solar cells. The simulations are based on a finite-element discretization of the drift-diffusion equations and take into account the polarization pattern experimentally derived from piezoresponse force micrographs. Based on the knowledge of the crystalline structure, symmetry considerations and electrical simulations, we discuss models for the polarization orientation pattern and magnitude of the ferroelectric domains. We conclude that the in-plane polarization vectors have 45° orientation towards the domain walls and form herring-bone structures. The presence of ordered ferroelectric domains, even with a weak characteristic polarization magnitude enhances the power conversion efficiencies and are mandatory to reproduce the experimental J-V characteristics.

这项工作详细分析了铁电极化模式对甲基铵碘化铅（MAPbI ₃）薄膜上相应太阳能电池的合资特性。该模拟基于漂移扩散方程的有限元离散化，并考虑了从压电响应力显微照片实验得出的极化图。基于晶体结构的知识，对称性考虑因素和电模拟，我们讨论了极化取向图案和铁电畴的大小的模型。我们得出的结论是，平面内极化矢量朝向畴壁具有45°方向，并形成人字形结构。即使具有弱的特征极化幅度，有序铁电畴的存在也会提高功率转换效率，并且对于重现实验性的合资特征是必不可少的。