Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 52, Pages 27299-27306Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202112555
Keywords
perovskites; solar cells
Categories
Funding
- National Key Research and Development (R&D) Program of China [2019YFE0108600, 2016YFA0202402]
- National Natural Science Foundation of China [52073198, 61911530158, 22161142003]
- Science and Technology Program of Jiangsu Province [BZ2020011]
- Natural Science Foundation of Jiangsu Province of China [BK20211598]
- 111 projects
- China Scholarship Council (CSC)
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_2645]
- Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Natural Sciences and Engineering Research Council of Canada
- SUNRISE project [EP/P032591/1]
- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- DOE Office of Energy Efficiency and Renewable Energy Solar Energy Technologies Office under the De-risking Halide Perovskite Solar Cells Program
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A combined strategy of precursor engineering and grain anchoring was successfully used to prepare stable alpha-FAPbI(3) films, leading to a significant increase in efficiency for FAPbI(3) perovskite solar cells and exhibiting good thermal stability.
alpha-Formamidinium lead iodide (alpha-FAPbI(3)) 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 alpha-FAPbI(3) 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 alpha-FAPbI(3) films. The incorporation of volatile FA-based additives in the precursor solutions completely suppresses the formation of non-perovskite delta-FAPbI(3) during film crystallization. Grains of the desired alpha-phase are anchored together and stabilized when 4-tert-butylbenzylammonium iodide is permeated into the alpha-FAPbI(3) film interior via grain boundaries. This cooperative scheme leads to a significantly increased efficiency close to 21 % for FAPbI(3) perovskite solar cells. Moreover, the stabilized PSCs exhibit improved thermal stability and maintained approximate to 90 % of their initial efficiency after storage at 50 degrees C for over 1600 hours.
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