4 years ago

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

Hyo-Ju Lee, Semi Oh, Soo Hyun Kang, Seong-Ju Park, Gyu-Jae Yohn, Kab Ha, Kyoung-Kook Kim
Self-standing ZnO nanotube (ZNT) arrays were fabricated on the surface of 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 (PEE), 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.

Publisher URL: http://doi.org/10.1088/1361-6528/aa98f5

DOI: 10.1088/1361-6528/aa98f5

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