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• W4377019997 abstract "Two-dimensional (2D) halide perovskites offer a unique platform for investigating the ground state of materials possessing significant anharmonicity. In contrast to three-dimensional perovskites, their 2D counterparts offer substantially fewer degrees of freedom, resulting in multiple well-defined crystal structures. In this work, we thoroughly investigate the anharmonic ground state of the benchmark (PEA)2PbI4 compound, using complementary information from low-temperature X-ray diffraction (XRD) and photoluminescence spectroscopy, supported by density functional theory calculations. We extrapolate four crystallographic configurations from low-temperature XRD. These configurations imply that the ground state has an intrinsic disorder stemming from two coexisting chiral sublattices, each with a bioriented organic spacer molecule. We further show evidence that these chiral structures form unevenly populated ground states, portraying uneven anharmonicity, where the state population may be tuned by surface effects. Our results uncover a disordered ground state that may induce intrinsic grain boundaries, which cannot be ignored in practical applications." @default.
• W4377019997 created "2023-05-19" @default.
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• W4377019997 date "2023-05-18" @default.
• W4377019997 modified "2023-10-17" @default.
• W4377019997 title "Uncovering Multiple Intrinsic Chiral Phases in (PEA)₂PbI₄ Halide Perovskites" @default.
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• W4377019997 doi "https://doi.org/10.1021/acs.jpclett.3c00685" @default.
• W4377019997 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37200134" @default.
• W4377019997 hasPublicationYear "2023" @default.
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