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题目：

Combined Precursor Engineering and Grain Anchoring Leading to MA-Free, Phase-Pure, and Stable α-Formamidinium Lead Iodide Perovskites for Efficient Solar Cells

作者：

Xufeng Ling,^1,2,+ Hongwei Zhu,^2,+ Weidong Xu,^3,+ Cheng Liu,¹ Linfeng Pan,⁴ Dan Ren,² Jianyu Yuan,^1,* Bryon W. Larson,⁵ Carole Gr?tzel,² Ahmad R. Kirmani,⁵ Olivier Ouellette,² Anurag Krishna,⁴ Jianguo Sun,¹ Chunyang Zhang,² Youyong Li,¹ Shaik M. Zakeeruddin,² Jing Gao,² Yuhang Liu, ^2,* James R. Durrant,^3,6Joseph M. Luther,⁵ Wanli Ma,^1,* and Michael Gr?tzel^2,*

单位：

¹ Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, Jiangsu 215123 (China)
² Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, ?cole Polytechnique Fédérale de Lausanne (EPFL), Station 6, 1015 Lausanne (Switzerland)
³ Department of Chemistry and Centre for Processable Electronics
Imperial College, London, SW7 2AZ (UK)

⁴ Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, ?cole Polytechnique Fédérale de Lausanne (EPFL), Station 6, Lausanne CH-1015 (Switzerland)

⁵ Chemistry & Nanoscience Center, National Renewable Energy Laboratory, Golden, CO 80401 (USA)

⁶ SPECIFIC IKC, College of Engineering, Swansea University, Bay Campus,Fabian Way, Swansea SA1 8EN (UK)

摘要：

α-Formamidinium lead iodide (α-FAPbI₃) is one of the most promising candidate materials for high-efficiency and thermally stable perovskite solar cells (PSCs) owing to its outstanding optoelectrical properties and high thermal stability. However, achieving a stable form of α-FAPbI₃ where both the composition and the phase are pure is very challenging. Herein, we report on a combined strategy of precursor engineering and grain anchoring to successfully prepare methylammonium (MA)-free and phase-pure stable α-FAPbI₃ films. The incorporation of volatile FA-based additives in the precursor solutions completely suppresses the formation of non-perovskite δ-FAPbI₃ during film crystallization. Grains of the desired α-phase are anchored together and stabilized when 4-tert-butylbenzylammonium iodide is permeated into the α-FAPbI₃ film interior via grain boundaries. This cooperative scheme leads to a significantly increased efficiency close to 21?% for FAPbI₃ perovskite solar cells. Moreover, the stabilized PSCs exhibit improved thermal stability and maintained ≈90?% of their initial efficiency after storage at 50?°C for over 1600?hours.

影响因子：

12.959

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/10.1002/anie.202112555