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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

Journal Article · · Angewandte Chemie (International Edition)

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.

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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