Temperature and pressure photoluminescence on FAxMA1-xPbI3 crystals shows gap bowing originates primarily from anomalous electron-phonon coupling via mixed FA librations and inorganic cage phonons in low-T phases.
Temperature Dependence of the Band Structure of Semiconductors: Electron-Phonon Interaction
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Origin of the Temperature-Induced Gap Bowing of Formamidinium-Methylammonium Lead Iodide Perovskites: Role of Cationic Rattlers
Temperature and pressure photoluminescence on FAxMA1-xPbI3 crystals shows gap bowing originates primarily from anomalous electron-phonon coupling via mixed FA librations and inorganic cage phonons in low-T phases.