Self-standing ZnO nanotube/SiO2 core-shell arrays for high photon extraction efficiency in III-nitride emitter

Self-standing ZnO nanotube (ZNT) arrays were fabricated on the surface of a GaN-based emitter with an indium tin oxide (ITO) transparent layer using a hydrothermal method and temperature cooling down process. For the greater enhancement of photon extraction efficiency, ZNT/SiO2 core-shell nanostruct...

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Published inNanotechnology Vol. 29; no. 1; p. 015301
Main Authors Oh, Semi, Ha, Kab, Kang, Soo-Hyun, Yohn, Gyu-Jae, Lee, Hyo-Ju, Park, Seong-Ju, Kim, Kyoung-Kook
Format Journal Article
LanguageEnglish
Published IOP Publishing 05.01.2018
Subjects
core-shell arrays
emitter
photon extraction efficiency
tubing depth
ZnO nanotube
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Summary:Self-standing ZnO nanotube (ZNT) arrays were fabricated on the surface of a GaN-based emitter with an indium tin oxide (ITO) transparent layer using a hydrothermal method and temperature cooling down process. For the greater enhancement of photon extraction efficiency, ZNT/SiO2 core-shell nanostructure arrays were fabricated on the emitter with a 430 nm wavelength. The optical output power of ZNT/SiO2 core-shell arrays on the emitter with ITO electrode was remarkably enhanced by 18.5%, 28.1%, and 55.9%, compared to those of ZNTs, ZNRs on an ITO film on an emitter and ITO film on an emitter as a conventional emitter, respectively. The large enhancement in optical output is attributable to the synergistic effect of efficient photon injection from the ITO/GaN layer to ZNTs because of the well-matched refractive indices and wave-guiding, in addition to the superior photon extraction by the SiO2 coating layer on the ZNTs.
Bibliography:NANO-115486.R1
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ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/aa98f5