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Vertical phase segregation suppression for efficient FA-based quasi-2D perovskite solar cells via HCl additive

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Abstract

Ruddlesden–Popper (RP) layered perovskites (with general formula of (RNH3)2An−1MnX3n+1) have drawn tremendous attention due to their excellent ambient stability while retaining promising device performance. However, quasi-2D perovskites with mixed-cation often suffer from severe phase segregation and vertically aligned multiple perovskite phases (with small n phases concentrated on the bottom and large n phases on the top) are usually formed. Here, we report a strategy to suppress vertical phase segregation by using hydrochloric acid (HCl) additive. As a result, homogenous quasi-2D perovskite films with uniform phase distribution and enhanced film quality are successfully obtained via this additive strategy, which is confirmed by PL measurements. With uniform distribution of different n value phases and high-quality film, FA-based quasi-2D perovskite solar cells with an efficiency of 13.16% and excellent stability was fabricated. This strategy paves a way to develop stable and efficient quasi-2D perovskite solar cells by suppressing phase segregation.

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Acknowledgements

The authors gratefully acknowledge the financial support from Sichuan Science and Technology Program (Grant 2018JY0015).

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  1. Institute of Photovoltaic, Southwest Petroleum University, Chengdu, 610500, People’s Republic of China

    Yuepeng Li, Haijin Li, Liuwen Tian, Qiyun Wang, Fengkai Wu, Fu Zhang, Lin Du & Yuelong Huang

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  1. Yuepeng Li
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  2. Haijin Li
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Li, Y., Li, H., Tian, L. et al. Vertical phase segregation suppression for efficient FA-based quasi-2D perovskite solar cells via HCl additive. J Mater Sci: Mater Electron 31, 12301–12308 (2020). https://doi.org/10.1007/s10854-020-03775-z

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