Polar or nonpolar? That is not the question for perovskite solar cells

@article{Huang2021PolarON,
  title={Polar or nonpolar? That is not the question for perovskite solar cells},
  author={Boyuan Huang and Zhenghao Liu and Changwei Wu and Yuning Zhang and Jinjin Zhao and Xiao Wang and Jiangyu Li},
  journal={National Science Review},
  year={2021},
  volume={8}
}
Abstract Perovskite solar cells (PSC) are promising next generation photovoltaic technologies, and there is considerable interest in the role of possible polarization of organic-inorganic halide perovskites (OIHPs) in photovoltaic conversion. The polarity of OIHPs is still hotly debated, however. In this review, we examine recent literature on the polarity of OIHPs from both theoretical and experimental points of view, and argue that they can be both polar and nonpolar, depending on composition… 
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