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- W2969841353 abstract "The initial interaction of atomic layer deposited films of Al 2 O 3 at room temperature on CH 3 NH 3 PbI 3 (MAPI) films is studied. Synchrotron radiation–based photoelectron spectroscopy is applied to analyze the initial changes in the Al‐derived features by comparing samples with different Al 2 O 3 film thicknesses. It is found that polarons and excitons, both intrinsic defects of Al 2 O 3 , play a key role in the interface formation. The polaronic states uptake a charge from the MAPI substrate. This charge is transferred to and stabilized in the excitonic state of Al 2 O 3 which is assigned to predominately tetrahedral coordinated Al sites. This charge transfer is initiated by vacancies present in the MAPI substrate and stabilizes a covalent bonding at the Al 2 O 3 –MAPI interface but also causes a roughening of the interface which may lead to the formation of grain boundaries. On top of the rough interface, 2D Al 2 O 3 clusters with an increasing number of octahedrally coordinated Al—O bonds grow, and with increasing Al 2 O 3 coverage, they introduce self‐healing of the structural defects." @default.
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- W2969841353 date "2019-09-03" @default.
- W2969841353 modified "2023-10-10" @default.
- W2969841353 title "Al<sub>2</sub>O<sub>3</sub>‐Atomic Layer Deposited Films on CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>: Intrinsic Defects and Passivation Mechanisms" @default.
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- W2969841353 doi "https://doi.org/10.1002/ente.201900975" @default.
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