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A Lead Iodide Perovskite Based on a Large Organic Cation for Solar Cell Applications
Author(s) -
Ma Chunqing,
Shen Dong,
Lo MingFai,
Lee ChunSing
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201805823
Subject(s) - perovskite (structure) , iodide , formamidinium , tetragonal crystal system , perovskite solar cell , band gap , chemistry , solar cell , inorganic chemistry , materials science , energy conversion efficiency , phase (matter) , crystallography , organic chemistry , optoelectronics
Methylammonium (CH 3 NH 3 + ) and formamidinium ((NH 2 ) 2 CH + ) based lead iodide perovskites are currently the two commonly used organic–inorganic lead iodide perovskites. There are still no alternative organic cations that can produce perovskites with band gaps spanning the visible spectrum (that is, <1.7 eV) for solar cell applications. Now, a new perovskite using large propane‐1,3‐diammonium cation (1,3‐Pr(NH 3 ) 2 2+ ) with a chemical structure of (1,3‐Pr(NH 3 ) 2 ) 0.5 PbI 3 is demonstrated. X‐ray diffraction (XRD) shows that the new perovskite exhibits a three‐dimensional tetragonal phase. The band gap of the new perovskite is about 1.6 eV, which is desirable for photovoltaic applications. A (1,3‐Pr(NH 3 ) 2 ) 0.5 PbI 3 perovskite solar cell (PSC) yields a power conversion efficiency (PCE) of 5.1 %. More importantly, this perovskite is composed of a large hydrophobic cation that provides better moisture resistance compared to CH 3 NH 3 PbI 3 perovskite.