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

Ling, Xufeng; Zhu, Hongwei; Xu, Weidong; Liu, Cheng; Pan, Linfeng; Ren, Dan; Yuan, Jianyu; Larson, Bryon W.; Gratzel, Carole; Kirmani, Ahmad R.; Ouellette, Olivier; Krishna, Anurag; Sun, Jianguo; Zhang, Chunyang; Li, Youyong; Zakeeruddin, Shaik M.; Gao, Jing; Liu, Yuhang; Durrant, James R.; Luther, Joseph M.; Ma, Wanli; Gratzel, Michael

doi:10.1002/anie.202112555

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

Journal Article · 28 October 2021 · Angewandte Chemie (International Edition)

DOI: https://doi.org/10.1002/anie.202112555 · OSTI ID:1837995

^[1]; Zhu, Hongwei ^[2]; Xu, Weidong ^[3]; Liu, Cheng ^[4]; Pan, Linfeng ^[2]; Ren, Dan ^[2]; Yuan, Jianyu ^[4]; Larson, Bryon W. ^[5]; Gratzel, Carole ^[2]; Kirmani, Ahmad R. ^[5]; Ouellette, Olivier ^[2]; Krishna, Anurag ^[2]; Sun, Jianguo ^[4]; Zhang, Chunyang ^[2]; Li, Youyong ^[4]; Zakeeruddin, Shaik M. ^[2]; Gao, Jing ^[2];

^[2]; Durrant, James R. ^[6];

^[5] more »

Soochow University, Suzhou (China); Ecole Polytechnique Federale Lausanne (Switzerland)
Ecole Polytechnique Federale Lausanne (Switzerland)
Imperial College, London (United Kingdom)
Soochow University, Suzhou (China)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Imperial College, London (United Kingdom); Swansea Univ. (United Kingdom)

a-Formamidinium lead iodide (a-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 a-FAPbI₃ where both the composition and the phase are pure is very challenging. In this work, we report on a combined strategy of precursor engineering and grain anchoring to successfully prepare methylammonium (MA)-free and phase-pure stable a-FAPbI₃ films. The incorporation of volatile FA-based additives in the precursor solutions completely suppresses the formation of non-perovskite d-FAPbI₃ during film crystallization. Grains of the desired a-phase are anchored together and stabilized when 4-tert-butylbenzylammonium iodide is permeated into the a-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 degrees C for over 1600 hours.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Key Research and Development (R&D) Program of China; National Natural Science Foundation of China (NSFC); Science and Technology Program of Jiangsu Province; Natural Science Foundation of Jiangsu Province; Postgraduate Research & Practice Innovation Program of Jiangsu Province; Natural Sciences and Engineering Research Council of Canada (NSERC)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1837995

Alternate ID(s):: OSTI ID: 1832055

Report Number(s):: NREL/JA--5900-80976; MainId:79752; UUID:415ae31a-0df5-4f7a-a97f-6c35d70644dd; MainAdminID:63523

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 52 Vol. 60; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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

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