Journal
SCIENCE
Volume 371, Issue 6536, Pages 1359-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abf7652
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Funding
- Natural Science Foundation of China [51602149, 61705102, 91833304, 91733302]
- Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars, China [BK20200034]
- National Key Research and Development Program of China [2017YFA0403400]
- Projects of International Cooperation and Exchanges NSFC [51811530018]
- Young 1000 Talents Global Recruitment Program of China
- Jiangsu Specially-Appointed Professor Program
- Six talent peaks Project in Jiangsu Province, China
- Scientific Research Fund of Hunan Provincial Education Department [20B121]
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A new method for synthesizing stable black-phase formamidinium lead iodide (α-FAPbI(3)) was reported, which enables the stable synthesis of α-FAPbI(3) under high temperature and humidity conditions, and maintains high efficiency under light stress.
The stabilization of black-phase formamidinium lead iodide (alpha-FAPbI(3)) perovskite under various environmental conditions is considered necessary for solar cells. However, challenges remain regarding the temperature sensitivity of alpha-FAPbI(3) and the requirements for strict humidity control in its processing. Here we report the synthesis of stable alpha-FAPbI(3), regardless of humidity and temperature, based on a vertically aligned lead iodide thin film grown from an ionic liquid, methylamine formate. The vertically grown structure has numerous nanometer-scale ion channels that facilitate the permeation of formamidinium iodide into the lead iodide thin films for fast and robust transformation to alpha-FAPbI(3). A solar cell with a power-conversion efficiency of 24.1% was achieved. The unencapsulated cells retain 80 and 90% of their initial efficiencies for 500 hours at 85 degrees C and continuous light stress, respectively.
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