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    Experiments towards size and dopant control of germanium quantum dots for solar applications

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    Author
    Oliva-Chatelain, Brittany L.; Barron, Andrew R.
    Date
    2016
    Abstract
    While the literature for the doping of silicon quantum dots (QDs) and nanocrystals (NCs) is extensive, reports of doping their germanium analogs are sparse. We report a range of attempts to dope Ge QDs both during and post-synthesis. The QDs have been characterized by TEM, XPS, and I/V measurements of SiO2 coated QD thin films in test cells using doped Si substrates. The solution synthesis of Ge QDs by the reduction of GeCl4 with LiAlH4 results in Ge QDs with a low level of chlorine atoms on the surface; however, during the H2PtCl6 catalyzed alkylation of the surface with allylamine, to enable water solubility of the Ge QDs, chlorine functionalization of the surface occurs resulting in p-type doping of the QD. A similar location of the dopant is proposed for phosphorus when incorporated by the addition of PCl3 during QD synthesis; however, the electronic doping effect is greater. The detected dopants are all present on the surface of the QD (s-type), suggesting a self-purification process is operative. Attempts to incorporate boron or gallium during synthesis were unsuccessful.
    Citation
    Oliva-Chatelain, Brittany L. and Barron, Andrew R.. "Experiments towards size and dopant control of germanium quantum dots for solar applications." AIMS Materials Science, 3, no. 1 (2016) AIMS Press: 1-21. http://dx.doi.org/10.3934/matersci.2016.1.1.
    Published Version
    http://dx.doi.org/10.3934/matersci.2016.1.1
    Keyword
    dopant; quantum dot; germanium; silica; phosphorous
    Type
    Journal article
    Publisher
    AIMS Press
    Citable link to this page
    https://hdl.handle.net/1911/87843
    Rights
    This is an open access article distributed under the terms of the Creative Commons Attribution Licese
    Link to License
    http://creativecommons.org/licenses/by/4.0/
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    • Chemistry Publications [636]
    • Faculty Publications [4988]
    • Mechanical Engineering Publications [151]

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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map