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    Flexible InGaN nanowire membranes for enhanced solar water splitting

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    oe-26-14-A640.pdf
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    Type
    Article
    Authors
    Elafandy, Rami T. cc
    Elafandy, Rami T. cc
    Min, Jung-Wook
    Zhao, Chao cc
    Ng, Tien Khee cc
    Ooi, Boon S. cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Photonics Laboratory
    KAUST Grant Number
    BAS/1/1614-01- 01
    Date
    2018-05-30
    Online Publication Date
    2018-05-30
    Print Publication Date
    2018-07-09
    Permanent link to this record
    http://hdl.handle.net/10754/628009
    
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    Abstract
    III-Nitride nanowires (NWs) have recently emerged as potential photoelectrodes for efficient solar hydrogen generation. While InGaN NWs epitaxy over silicon is required for high crystalline quality and economic production, it leads to the formation of the notorious silicon nitride insulating interface as well as low electrical conductivity which both impede excess charge carrier dynamics and overall device performance. We tackle this issue by developing, for the first time, a substrate-free InGaN NWs membrane photoanodes, through liftoff and transfer techniques, where excess charge carriers are efficiently extracted from the InGaN NWs through a proper ohmic contact formed with a high electrical conductivity metal stack membrane. As a result, compared to conventional InGaN NWs on silicon, the fabricated free-standing flexible membranes showed a 10-fold increase in the generated photocurrent as well as a 0.8 V cathodic shift in the onset potential. Through electrochemical impedance spectroscopy, accompanied with TEM-based analysis, we further demonstrated the detailed enhancement within excess charge carrier dynamics of the photoanode membranes. This novel configuration in photoelectrodes demonstrates a novel pathway for enhancing the performance of III-nitrides photoelectrodes to accelerate their commercialization for solar water splitting.
    Citation
    ElAfandy RT, Ebaid M, Min J-W, Zhao C, Ng TK, et al. (2018) Flexible InGaN nanowire membranes for enhanced solar water splitting. Optics Express 26: A640. Available: http://dx.doi.org/10.1364/oe.26.00a640.
    Sponsors
    BSO, TKN and CZ acknowledge funding support from King Abdulaziz City for Science and Technology (KACST) Technology Innovation Center (TIC) for Solid State Lighting, grant no. KACST TIC R2-FP-008. King Abdullah University of Science and Technology (KAUST) baseline funding, grant no. BAS/1/1614-01- 01.
    Publisher
    The Optical Society
    Journal
    Optics Express
    DOI
    10.1364/oe.26.00a640
    Additional Links
    https://www.osapublishing.org/oe/abstract.cfm?uri=oe-26-14-A640
    ae974a485f413a2113503eed53cd6c53
    10.1364/oe.26.00a640
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Photonics Laboratory; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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