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  • Why Do Colloidal Wurtzite Semiconductor Nanoplatelets Have an Atomically Uniform Thickness of Eight Monolayers?

    Author(s)
    Pang, Yingping
    Zhang, Minyi
    Chen, Dechao
    Chen, Wei
    Wang, Fei
    Anwar, Shaghraf Javaid
    Saunders, Martin
    Rowles, Matthew R
    Liu, Lihong
    Liu, Shaomin
    Sitt, Amit
    Li, Chunsen
    Jia, Guohua
    Griffith University Author(s)
    Chen, Dechao
    Year published
    2019
    Metadata
    Show full item record
    Abstract
    Herein we employed a first-principles method based on density functional theory to investigate the surface energy and growth kinetics of wurtzite nanoplatelets to elucidate why nanoplatelets exhibit a uniform thickness of eight monolayers. We synthesized a series of wurtzite nanoplatelets (ZnSe, ZnS, ZnTe, and CdSe) with an atomically uniform thickness of eight monolayers. As a representative example, the growth mechanism of 1.39 nm thick (eight monolayers) wurtzite ZnSe nanoplatelets was studied to substantiate the proposed growth kinetics. The results show that the growth of the seventh and eighth layers along the [112 0] ...
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    Herein we employed a first-principles method based on density functional theory to investigate the surface energy and growth kinetics of wurtzite nanoplatelets to elucidate why nanoplatelets exhibit a uniform thickness of eight monolayers. We synthesized a series of wurtzite nanoplatelets (ZnSe, ZnS, ZnTe, and CdSe) with an atomically uniform thickness of eight monolayers. As a representative example, the growth mechanism of 1.39 nm thick (eight monolayers) wurtzite ZnSe nanoplatelets was studied to substantiate the proposed growth kinetics. The results show that the growth of the seventh and eighth layers along the [112 0] direction of 0.99 nm (six monolayers) ZnSe magic-size nanoclusters is accessible, whereas the growth of the ninth layer is unlikely to occur because the formation energy is large. This work not only gives insights into the synthesis of atomically uniform thick wurtzite semiconductor nanoplatelets but also opens up new avenues to their applications in light-emitting diodes, catalysis, detectors, and lasers.
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    Journal Title
    Journal of Physical Chemistry Letters
    Volume
    10
    Issue
    12
    DOI
    https://doi.org/10.1021/acs.jpclett.9b01195
    Subject
    Physical sciences
    Chemical sciences
    Science & Technology
    Technology
    Chemistry, Physical
    Nanoscience & Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/397197
    Collection
    • Journal articles

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