ja2c13711_si_002.mp4 (43.88 MB)
Direct Observation of Transient Structural Dynamics of Atomically Thin Halide Perovskite Nanowires
mediaposted on 2023-02-16, 21:11 authored by Mengyu Gao, Yoonjae Park, Jianbo Jin, Peng-Cheng Chen, Hannah Devyldere, Yao Yang, Chengyu Song, Zhenni Lin, Qiuchen Zhao, Martin Siron, Mary C. Scott, David T. Limmer, Peidong Yang
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–/Å2·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.
unlocking new solutionsunique dynamical systemstudy new modesotherwise detrimental conditionselectron dose ratealbeit atomically thintransient structural dynamicsstructure dynamicswhose structuralstructural integritywork demonstratestranslational movementtime investigationsystematic understandingsitu significant impactsensitive materialsprotect beamphysical propertiesphase transitionnanoscale confinementlevel visualizationlevel performancelattice anharmonicityintrinsic instabilityhalide perovskiteeffective methodchemical processes000 e