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    Thermodynamic photoinduced disorder in AlGaN nanowires

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    Alfaraj_AIP Adv_7_12_125113_2017.pdf
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    Type
    Article
    Authors
    Alfaraj, Nasir cc
    Muhammed, Mufasila Mumthaz
    Li, Kuang-Hui
    Janjua, Bilal cc
    Aljefri, Renad A.
    Sun, Haiding cc
    Ng, Tien Khee cc
    Ooi, Boon S. cc
    Roqan, Iman S. cc
    Li, Xiaohang cc
    KAUST Department
    Advanced Semiconductor Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
    Semiconductor and Material Spectroscopy Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
    Photonics Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
    Date
    2017-12-13
    Online Publication Date
    2017-12-13
    Print Publication Date
    2017-12
    Permanent link to this record
    http://hdl.handle.net/10754/626363
    
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    Abstract
    In this study, we examine thermodynamic photoinduced disorder in AlGaN nanowires through their steady-state and transient photoluminescence properties. We correlate the energy exchange during the photoexcitation and photoemission processes of the light–solid reaction and the generation of photoinduced entropy of the nanowires using temperature-dependent (6 K to 290 K) photoluminescence. We observed an oscillatory trend in the generated entropy of the system below 200 K, with an oscillation frequency that was significantly lower than what we have previously observed in InGaN/GaN nanowires. In contrast to the sharp increase in generated entropy at temperatures close to room temperature in InGaN/GaN nanowires, an insignificant increase was observed in AlGaN nanowires, indicating lower degrees of disorder-induced uncertainty in the wider bandgap semiconductor. We conjecture that the enhanced atomic ordering in AlGaN caused lower degrees of disorder-induced uncertainty related to the energy of states involved in thermionic transitions; in keeping with this conjecture, we observed lower oscillation frequency below 200 K and a stable behavior in the generated entropy at temperatures close to room temperature.
    Citation
    Thermodynamic photoinduced disorder in AlGaN nanowires 2017, 7 (12):125113 AIP Advances
    Sponsors
    This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) baseline funding, BAS/1/1664-01-01 and BAS/1/1647-01-05. B.J., T.K.N., and B.S.O. acknowledge the financial support from King Abdulaziz City for Science and Technology (KACST), Grant No. KACST TIC R2-FP-008, and KAUST baseline funding, BAS/1/1614-01-01.
    Publisher
    AIP Publishing
    Journal
    AIP Advances
    DOI
    10.1063/1.5003443
    Additional Links
    http://aip.scitation.org/doi/10.1063/1.5003443
    https://doi.org/10.1063/1.5003443
    https://www.researchgate.net/publication/321777725_Thermodynamic_photoinduced_disorder_in_AlGaN_nanowires
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.5003443
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