TY - JOUR
T1 - Engineering of CH 3 NH 3 PbI 3 Perovskite Crystals by Alloying Large Organic Cations for Enhanced Thermal Stability and Transport Properties
AU - Peng, Wei
AU - Miao, Xiaohe
AU - Adinolfi, Valerio
AU - Alarousu, Erkki
AU - El Tall, Omar
AU - Emwas, Abdul-Hamid M.
AU - Zhao, Chao
AU - Walters, Grant
AU - Liu, Jiakai
AU - Ouellette, Olivier
AU - Pan, Jun
AU - Banavoth, Murali
AU - Sargent, Edward H.
AU - Mohammed, Omar F.
AU - Bakr, Osman
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This 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.
PY - 2016/7/28
Y1 - 2016/7/28
N2 - The 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.
AB - The 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.
UR - http://hdl.handle.net/10754/623146
UR - http://doi.wiley.com/10.1002/anie.201604880
UR - http://www.scopus.com/inward/record.url?scp=84979787930&partnerID=8YFLogxK
U2 - 10.1002/anie.201604880
DO - 10.1002/anie.201604880
M3 - Article
C2 - 27468159
SN - 1433-7851
VL - 55
SP - 10686
EP - 10690
JO - Angewandte Chemie International Edition
JF - Angewandte Chemie International Edition
IS - 36
ER -