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Guanine‐Stabilized Formamidinium Lead Iodide Perovskites
Author(s) -
Hong Li,
Milić Jovana V.,
Ahlawat Paramvir,
Mladenović Marko,
Kubicki Dominik J.,
Jahanabkhshi Farzaneh,
Ren Dan,
GélvezRueda María C.,
RuizPreciado Marco A.,
Ummadisingu Amita,
Liu Yuhang,
Tian Chengbo,
Pan Linfeng,
Zakeeruddin Shaik M.,
Hagfeldt Anders,
Grozema Ferdinand C.,
Rothlisberger Ursula,
Emsley Lyndon,
Han Hongwei,
Graetzel Michael
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201912051
Subject(s) - formamidinium , perovskite (structure) , iodide , phase (matter) , thermal stability , materials science , chemistry , spectroscopy , chemical engineering , photochemistry , inorganic chemistry , crystallography , organic chemistry , physics , quantum mechanics , engineering
Abstract Formamidinium (FA) lead iodide perovskite materials feature promising photovoltaic performances and superior thermal stabilities. However, conversion of the perovskite α‐FAPbI 3 phase to the thermodynamically stable yet photovoltaically inactive δ‐FAPbI 3 phase compromises the photovoltaic performance. A strategy is presented to address this challenge by using low‐dimensional hybrid perovskite materials comprising guaninium (G) organic spacer layers that act as stabilizers of the three‐dimensional α‐FAPbI 3 phase. The underlying mode of interaction at the atomic level is unraveled by means of solid‐state nuclear magnetic resonance spectroscopy, X‐ray crystallography, transmission electron microscopy, molecular dynamics simulations, and DFT calculations. Low‐dimensional‐phase‐containing hybrid FAPbI 3 perovskite solar cells are obtained with improved performance and enhanced long‐term stability.