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• W2566456216 abstract "We carried out calculations based on density functional theory to investigate the electronic, vibrational, and dielectric properties of mixed halide perovskites CH3NH3 AI3–xClx with A = Pb and Sn. Computed free energies indicated that Cl mixed systems may be formed only for Cl concentrations not exceeding 1019 cm–3, and phonon calculations showed that the disorder induced in the host lattice by the presence of a smaller halogen is responsible for mechanical instabilities. However, we found that the presence of chloride may be beneficial to the electronic properties of the perovskites. Chloride anions cause the organic cations to be displaced from the center of the cage; such a displacement induces preferential orientations of the cation dipole, which in turn are responsible for notable changes in the dielectric properties of the material and possibly for the formation of local ferroelectric domains. The latter are instrumental in separating electron hole pairs and hence in contributing to long charge-carrier diffusion lengths, in spite of polarons being more likely formed in mixed perovksites than in CH3NH3AI3." @default.
• W2566456216 created "2017-01-06" @default.
• W2566456216 creator A5007878446 @default.
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• W2566456216 date "2016-12-28" @default.
• W2566456216 modified "2023-09-25" @default.
• W2566456216 title "Instability and Efficiency of Mixed Halide Perovskites CH₃NH₃AI_3–<i>x</i>Cl_<i>x</i> (A = Pb and Sn): A First-Principles, Computational Study" @default.
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• W2566456216 doi "https://doi.org/10.1021/acs.chemmater.6b04300" @default.
• W2566456216 hasPublicationYear "2016" @default.
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