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Title: Enhanced photovoltaic performance and thermal stability of CH3NH3PbI3 perovskite through lattice symmetrization
Authors: Shao, Feng
Qin, Peng
Wang, Dong
Zhang, Guoqing
Wu, Bo
He, Jianqiao
Peng, Wei
Sum, Tze Chien
Wang, Deliang
Huang, Fuqiang
Keywords: Engineering::Materials::Functional materials
Issue Date: 2018
Source: Shao, F., Qin, P., Wang, D., Zhang, G., Wu, B., He, J., . . . Huang, F. (2019). Enhanced photovoltaic performance and thermal stability of CH3NH3PbI3 perovskite through lattice symmetrization. ACS Applied Materials and Interfaces, 11(1), 740-746. doi:10.1021/acsami.8b17068
Project: CAS Pioneer Hundred Talents Program, the Natural Science Foundation of Shanghai (17ZR1434400)
National Key R&D Program of China (Grant No. 2016YFB 0901600)
National Natural Science Foundation of China (Grant 6137-6056)
Science and Technology Commission of Shanghai (Grant 16JC1401700)
Key Research Program of the CAS (Grant QYZDJ-SSW-JSC013)
MOE Tier 1 grant RG173/16
MOE Tier 2 grants MOE2014-T2- 1-044, MOE2015-T2-2-015, and MOE2016-T2-1-034
NRF Investigatorship NRF-NRFI-2018-04
Journal: ACS Applied Materials and Interfaces
Abstract: The organic-inorganic lead halide perovskites are attractive materials for photovoltaic application. The most widely studied perovskites based on methyl ammonium organic cation are less likely to form an ideal high-symmetry configuration at room temperature, leading to the appearance of local lattice strain. Herein, this study reports a strategy for the construction of thermally stable cubic perovskites at room temperature through the incorporation of the larger organic cation dimethyl ammonium. Detailed characterization on the single crystals and thin films reveals the formation of cubic phase with the addition of a certain amount of dimethyl ammonium at room temperature. With the presence of dimethyl ammonium, the nonradiative recombination in perovskite is suppressed, showing a longer PL lifetime and hole diffusion length. The more efficient charge extraction leads to an improvement in the photocurrent density, and then the device efficiency from 17.1% to 18.6%, together with an enhanced thermal stability at 85 °C. The influence of incorporating a larger organic cation on the structural configuration, optical properties, charge extraction, as well as the photovoltaic performance is systematically investigated, which offers an alternative way to improve the intrinsic stability of hybrid perovskites.
ISSN: 1944-8244
DOI: 10.1021/acsami.8b17068
DOI (Related Dataset):
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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