THz behavior originates from different arrangements of coalescent GaN nanorods grown on Si (111) and Si (100) substrates

Kwangwook Park, Jung-Wook Min, Ram Subedi, Mohammad Khaled Shakfa, Bambar Davaasuren, Tien Khee Ng, Boon S. Ooi, Chul Kang, Jongmin Kim

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6 Scopus citations


We investigate the coalescent GaN nanorods grown on Si (100) and Si (111) substrates. Our results clearly show that GaN nanorods grown on both substrates have the same structural, optical and morphological properties. However, we observed a clear difference in terahertz (THz) radiation between the two sets of GaN nanorods. With high gallium molecular beam flux around 6 × 10−7 Torr, coalescent GaN nanorods grown on Si (111) substrates exhibit observable THz radiation, while the ones grown on Si (100) substrates do not. The inactive THz behavior of the GaN nanorods grown on Si (100) substrate is due to the presence of randomly-rotated GaN nanorods during coalescence. The dissimilarity in THz radiation behavior between the two GaN nanorods, i.e. interfering incident optical pulse thus exhibiting inactive THz radiation from GaN nanorods grown on (100) substrate indicate that the nanorods are attractive for further THz applications not limited to III-N materials system but also other materials systems.
Original languageEnglish (US)
Pages (from-to)146422
JournalApplied Surface Science
StatePublished - Apr 25 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): BAS/1/1614-01-01
Acknowledgements: KP thanks Prof. Ji-Sang Park of Kyungpook National University, Republic of Korea and Dr. Kirstin Alberi of National Renewable Energy Laboratory (NREL), United States of America for their useful discussions. CK acknowledge that this work was supported by the Gwangju Institute of Science and Technology (GIST) Research Institute (GRI) grant funded by the GIST in 2020 and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. 2019R1F1A1063156). BSO, TKN, JWM, MKS and RS acknowledge the financial support from the King Abdulaziz City for Science and Technology (KACST) under Grant No. KACST TIC R2-FP-008. This work was partially supported by the King Abdullah University of Science and Technology (KAUST) baseline funding No. BAS/1/1614-01-01.


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