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Benzylammonium‐Mediated Formamidinium Lead Iodide Perovskite Phase Stabilization for Photovoltaics
Author(s) -
Alanazi Anwar Q.,
Almalki Masaud H.,
Mishra Aditya,
Kubicki Dominik J.,
Wang Zaiwei,
Merten Lena,
Eickemeyer Felix T.,
Zhang Hong,
Ren Dan,
Alyamani Ahmed Y.,
Albrithen Hamad,
Albadri Abdulrahman,
Alotaibi Mohammad Hayal,
Hinderhofer Alexander,
Zakeeruddin Shaik M.,
Schreiber Frank,
Hagfeldt Anders,
Emsley Lyndon,
Milić Jovana V.,
Graetzel Michael
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202101163
Subject(s) - formamidinium , perovskite (structure) , iodide , materials science , photovoltaics , phase (matter) , chemical engineering , inorganic chemistry , photovoltaic system , organic chemistry , chemistry , ecology , engineering , biology
There is an ongoing surge of interest in the use of formamidinium (FA) lead iodide perovskites in photovoltaics due to their exceptional optoelectronic properties. However, thermodynamic instability of the desired cubic perovskite (α‐FAPbI 3 ) phase at ambient conditions leads to the formation of a yellow non‐perovskite (δ‐FAPbI 3 ) phase that compromises its utility. A stable α‐FAPbI 3 perovskite phase is achieved by employing benzylammonium iodide (BzI) and the microscopic structure is elucidated by using solid‐state NMR spectroscopy and X‐ray scattering measurements. Perovskite solar cells based on the FAPbI 3 (BzI) 0.25 composition achieve power conversion efficiencies exceeding 20%, which is accompanied by enhanced shelf‐life and operational stability, maintaining 80% of the performance after one year at ambient conditions.