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  • Ligand effects on electronic and optoelectronic properties of two-dimensional PbS necking percolative superlattices

    Author(s)
    Zhao, Man
    Ding, Defang
    Yang, Fangxu
    Wang, Dawei
    Lv, Jiawei
    Hu, Wenping
    Lu, Chenguang
    Tang, Zhiyong
    Griffith University Author(s)
    Tang, Zhiyong
    Year published
    2017
    Metadata
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    Abstract
    The inter-nanocrystal (NC) distance, necking degree, ordering level, and NC surface ligands all affect the electronic and optoelectronic properties of NC solids. Herein, we introduce a unique PbS structure of necking percolative superlattices to exclude the morphological factors and study the effect of ligands on the NC properties. X-ray photoelectron spectroscopy data indicate that 1,2-ethanedithiol (EDT), oxalic acid, mercaptopropionic acid, and NH4SCN (SCN) ligands were attached to the surface of NCs by substrate-supported ligand exchange. Field-effect transistors were tested and photodetector measurements were performed ...
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    The inter-nanocrystal (NC) distance, necking degree, ordering level, and NC surface ligands all affect the electronic and optoelectronic properties of NC solids. Herein, we introduce a unique PbS structure of necking percolative superlattices to exclude the morphological factors and study the effect of ligands on the NC properties. X-ray photoelectron spectroscopy data indicate that 1,2-ethanedithiol (EDT), oxalic acid, mercaptopropionic acid, and NH4SCN (SCN) ligands were attached to the surface of NCs by substrate-supported ligand exchange. Field-effect transistors were tested and photodetector measurements were performed to compare these NC solids. An SCN-treated film had the highest mobility and responsivity under high-power intensity irradiation owing to its high carrier density, whereas an EDT-treated film had the lowest mobility, photocurrent, and dark current. These findings introduce new avenues for choosing suitable ligands for NC applications.
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    Journal Title
    Nano Research
    DOI
    https://doi.org/10.1007/s12274-016-1351-z
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Nanotechnology not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/172613
    Collection
    • Journal articles

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