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ArticleAuthors
Alfaraj, Nasir
Muhammed, Mufasila Mumthaz
Li, Kuang-Hui
Janjua, Bilal

Aljefri, Renad A.
Sun, Haiding

Ng, Tien Khee

Ooi, Boon S.

Roqan, Iman S.

Li, Xiaohang

KAUST Department
Advanced Semiconductor Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi ArabiaSemiconductor 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
2017-12-13Online Publication Date
2017-12-13Print Publication Date
2017-12Permanent link to this record
http://hdl.handle.net/10754/626363
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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 AdvancesSponsors
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 PublishingJournal
AIP AdvancesAdditional Links
http://aip.scitation.org/doi/10.1063/1.5003443https://doi.org/10.1063/1.5003443
https://www.researchgate.net/publication/321777725_Thermodynamic_photoinduced_disorder_in_AlGaN_nanowires
ae974a485f413a2113503eed53cd6c53
10.1063/1.5003443