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    Efficient Light Absorption by GaN Truncated Nanocones for High Performance Water Splitting Applications

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    Type
    Article
    Authors
    Kim, Yeong Jae
    Lee, Gil Ju
    Kim, Seungkyu
    Min, Jung-Wook
    Jeong, Sang Yun
    Yoo, Young Jin
    Lee, Sanghan
    Song, Young Min
    KAUST Department
    Photonics Laboratory
    Date
    2018-08-07
    Online Publication Date
    2018-08-07
    Print Publication Date
    2018-08-29
    Permanent link to this record
    http://hdl.handle.net/10754/630508
    
    Metadata
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    Abstract
    Despite the importance of gallium nitride (GaN) nanostructures for photocatalytic activity, relatively little attention has been paid to their geometrical optimization on the basis of wave optics. In this study, we present GaN truncated nanocones to provide a strategy for improving solar water splitting efficiencies, compared to the efficiency provided by the conventional geometries (i.e., flat surface, cylindrical, and cone shapes). Computational results with a finite difference time domain (FDTD) method and a rigorous coupled-wave analysis (RCWA) reveal important aspects of truncated nanocones, which effectively concentrate light in the center of the nanostructures. The introduction of nanostructures is highly recommended to address the strong light reflection of photocatalytic materials and carrier lifetime issues. To fabricate the truncated nanocones at low cost and with large-area, a dry etching method was employed with thermally dewetted metal nanoparticles, which enables controllability of desired features on a wafer scale. Experimental results exhibit that the photocurrent density of truncated nanocones is improved about three times higher compared to that of planar GaN.
    Citation
    Kim YJ, Lee GJ, Kim S, Min J-W, Jeong SY, et al. (2018) Efficient Light Absorption by GaN Truncated Nanocones for High Performance Water Splitting Applications. ACS Applied Materials & Interfaces 10: 28672–28678. Available: http://dx.doi.org/10.1021/acsami.8b09084.
    Sponsors
    This work was supported by an Institute for Information & Communications Technology Promotion (IITP) grant funded by the Korea government (MSIP) (No.2017000709), The Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Korea government (MSIP) (NRF-2017M3D1A1039288) and Korea Basic Science Institute under the R&D program (Project No. D37615) supervised by the Ministry of Science.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Materials & Interfaces
    DOI
    10.1021/acsami.8b09084
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsami.8b09084
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsami.8b09084
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