Engineering of CH 3 NH 3 PbI 3 Perovskite Crystals by Alloying Large Organic Cations for Enhanced Thermal Stability and Transport Properties
El Tall, Omar
Emwas, Abdul-Hamid M.
Sargent, Edward H.
Mohammed, Omar F.
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Imaging and Characterization Core Lab
Analytical Core Lab
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AbstractThe number of studies on organic–inorganic hybrid perovskites has soared in recent years. However, the majority of hybrid perovskites under investigation are based on a limited number of organic cations of suitable sizes, such as methylammonium and formamidinium. These small cations easily fit into the perovskite's three-dimensional (3D) lead halide framework to produce semiconductors with excellent charge transport properties. Until now, larger cations, such as ethylammonium, have been found to form 2D crystals with lead halide. Here we show for the first time that ethylammonium can in fact be incorporated coordinately with methylammonium in the lattice of a 3D perovskite thanks to a balance of opposite lattice distortion strains. This inclusion results in higher crystal symmetry, improved material stability, and markedly enhanced charge carrier lifetime. This crystal engineering strategy of balancing opposite lattice distortion effects vastly increases the number of potential choices of organic cations for 3D perovskites, opening up new degrees of freedom to tailor their optoelectronic and environmental properties.
CitationPeng W, Miao X, Adinolfi V, Alarousu E, El Tall O, et al. (2016) Engineering of CH3NH3PbI3 Perovskite Crystals by Alloying Large Organic Cations for Enhanced Thermal Stability and Transport Properties. Angewandte Chemie International Edition 55: 10686–10690. Available: http://dx.doi.org/10.1002/anie.201604880.
SponsorsThis work was supported by King Abdullah University of Science and Technology (KAUST) in Saudi Arabia. W.P. thanks Dr. Yao He and Dr. Xiang Yu from Imaging and Characterization Core Lab (KAUST) for their assistance in the temperature-dependent XRD system set-up and measurement.