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Fully Solution Processed Pure α‐Phase Formamidinium Lead Iodide Perovskite Solar Cells for Scalable Production in Ambient Condition
Author(s) -
Yang Fu,
Dong Lirong,
Jang Dongju,
Tam Kai Cheong,
Zhang Kaicheng,
Li Ning,
Guo Fei,
Li Cong,
Arrive Charline,
Bertrand Mélanie,
Brabec Christoph J.,
Egelhaaf HansJoachim
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202001869
Subject(s) - materials science , perovskite (structure) , formamidinium , chemical engineering , iodide , photovoltaic system , crystallization , glovebox , thermal stability , fabrication , nanotechnology , optoelectronics , inorganic chemistry , organic chemistry , chemistry , medicine , ecology , alternative medicine , pathology , engineering , biology
Manufacturing commercially viable perovskite solar cells still requires appropriate low‐temperature and scalable deposition processes to be developed. While α‐phase FAPbI 3 has higher thermal stability and broader absorption than MAPbI 3 , there still is no report of a pure α‐phase FAPbI 3 perovskite film obtained by a scalable printing method. Moreover, spontaneous conversion of the α‐phase to non‐perovskite δ‐phase under ambient conditions poses a serious challenge for practical applications. Herein, a scalable and fully solution based printing method for the fabrication of pure α‐phase FAPbI 3 perovskite solar cells is reported. Through adding N ‐methyl pyrrolidone and methylammonium chloride to the dimethylformamide based precursor solution to control the crystallization, and vacuum or air‐flow assisted film drying, pure α‐FAPbI 3 phase is obtained by doctor blading. The resulting α‐FAPbI 3 film is highly stable, with no δ‐FAPbI 3 phase being formed even after keeping it in an ambient atmosphere over a period of 200 days without encapsulation. In addition, a fully solution processed PSC with a PCE of 16.1% is processed by the vacuum assisted method, and 17.8% by the air‐flow assisted method. Replacing silver with a printed carbon electrode provides a stable PCE up to 15% for the vacuum assisted and 16.4% for the air‐flow assisted method, which is the highest performance of FAPbI 3 solar cells to date. Compared with MAPbI 3 , the fully printed FAPbI 3 perovskite devices exhibit a remarkable thermal stability in humid atmospheres which makes them a promising candidate for scalable production and commercialization.