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    Self-Assembly and Regrowth of Metal Halide Perovskite Nanocrystals for Optoelectronic Applications

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    Name:
    ACC. Chem. Res.pdf
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    5.348Mb
    Format:
    PDF
    Description:
    Accepted Manuscript
    Embargo End Date:
    2023-01-16
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    Type
    Article
    Authors
    Liu, Jiakai cc
    Zheng, Xiaopeng cc
    Mohammed, Omar F. cc
    Bakr, Osman cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Material Science and Engineering
    Chemical Science Program
    KAUST Solar Center (KSC)
    KAUST Catalysis Center (KCC)
    Date
    2022-01-16
    Embargo End Date
    2023-01-16
    Submitted Date
    2021-10-17
    Permanent link to this record
    http://hdl.handle.net/10754/675012
    
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    Abstract
    Conspectus Over the past decade, the impressive development of metal halide perovskites (MHPs) has made them leading candidates for applications in photovoltaics (PVs), X-ray scintillators, and light-emitting diodes (LEDs). Constructing MHP nanocrystals (NCs) with promising optoelectronic properties using a low-cost approach is critical to realizing their commercial potential. Self-assembly and regrowth techniques provide a simple and powerful “bottom-up” platform for controlling the structure, shape, and dimensionality of MHP NCs. The soft ionic nature of MHP NCs, in conjunction with their low formation energy, rapid anion exchange, and ease of ion migration, enables the rearrangement of their overall appearance via self-assembly or regrowth. Because of their low formation energy and highly dynamic surface ligands, MHP NCs have a higher propensity to regrow than conventional hard-lattice NCs. Moreover, their self-assembly and regrowth can be achieved simultaneously. The self-assembly of NCs into close-packed, long-range-ordered mesostructures provides a platform for modulating their electronic properties (e.g., conductivity and carrier mobility). Moreover, assembled MHP NCs exhibit collective properties (e.g., superfluorescence, renormalized emission, longer phase coherence times, and long exciton diffusion lengths) that can translate into dramatic improvements in device performance. Further regrowth into fused MHP nanostructures with the removal of ligand barriers between NCs could facilitate charge carrier transport, eliminate surface point defects, and enhance stability against moisture, light, and electron-beam irradiation. However, the synthesis strategies, diversity and complexity of structures, and optoelectronic applications that emanate from the self-assembly and regrowth of MHPs have not yet received much attention. Consequently, a comprehensive understanding of the design principles of self-assembled and fused MHP nanostructures will fuel further advances in their optoelectronic applications. In this Account, we review the latest developments in the self-assembly and regrowth of MHP NCs. We begin with a survey of the mechanisms, driving forces, and techniques for controlling MHP NC self-assembly. We then explore the phase transition of fused MHP nanostructures at the atomic level, delving into the mechanisms of facet-directed connections and the kinetics of their shape-modulation behavior, which have been elucidated with the aid of high-resolution transmission electron microscopy (HRTEM) and first-principles density functional theory calculations of surface energies. We further outline the applications of assembled and fused nanostructures. Finally, we conclude with a perspective on current challenges and future directions in the field of MHP.
    Citation
    Liu, J., Zheng, X., Mohammed, O. F., & Bakr, O. M. (2022). Self-Assembly and Regrowth of Metal Halide Perovskite Nanocrystals for Optoelectronic Applications. Accounts of Chemical Research. doi:10.1021/acs.accounts.1c00651
    Publisher
    American Chemical Society (ACS)
    Journal
    Accounts of Chemical Research
    DOI
    10.1021/acs.accounts.1c00651
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.accounts.1c00651
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.accounts.1c00651
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; Material Science and Engineering Program; KAUST Catalysis Center (KCC); KAUST Solar Center (KSC)

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