Direct Observation of Transient Structural Dynamics of Atomically Thin Halide Perovskite Nanowires

MY Gao and Y Park and JB Jin and PC Chen and H Devyldere and Y Yang and CY Song and ZN Lin and QC Zhao and M Siron and MC Scott and DT Limmer and PD Yang, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 145, 4800-4807 (2023).

DOI: 10.1021/jacs.2c13711

Halide perovskite is a unique dynamical system, whose structural and chemical processes happening across different timescales have significant impact on its physical properties and device-level performance. However, due to its intrinsic instability, real-time investigation of the structure dynamics of halide perovskite is challenging, which hinders the systematic understanding of the chemical processes in the synthesis, phase transition, and degradation of halide perovskite. Here, we show that atomically thin carbon materials can stabilize ultrathin halide perovskite nanostructures against otherwise detrimental conditions. Moreover, the protective carbon shells enable atomic-level visualization of the vibrational, rotational, and translational movement of halide perovskite unit cells. Albeit atomically thin, protected halide perovskite nanostructures can maintain their structural integrity up to an electron dose rate of 10,000 e(-)/angstrom(2).s while exhibiting unusual dynamical behaviors pertaining to the lattice anharmonicity and nanoscale confinement. Our work demonstrates an effective method to protect beam-sensitive materials during in situ observation, unlocking new solutions to study new modes of structure dynamics of nanomaterials.

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