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Poster

Aligned growth of ZnO nanowires on diamond by nanoparticle-assisted pulsed laser deposition

Wednesday (24.06.2020)
11:56 - 11:59 Room 1
Part of:
Line-Up:
- Poster Processing of Functional Texturing on Micro-fibers by Laser Induced Periodic Surface Structures 1 Prof. Masaki Yamaguchi
- Poster 3D microfabrication of thermoset polymer PDMS using laser-induced bubble 1 Prof. Yasutaka Hanada
- Poster *student* Laser-Peening with solid state medium as plasma confinement layer 1 Yuki Sugimoto
- Poster *student* Numerical Simulation and Test Experiments of Selective Laser Thermoregulation for Accelerated Degradation Test of SiC/SiC CMC 1 Hayato Koshiji
- Poster *student* Laser peening of sprayed ceramics film 1 Yuya Yasuyoshi
- Poster *student* Influence of thickness of plasma confinement layer on laser peening using near infrared laser 1 Hikaru Hirata
- Poster *student* Green femtosecond laser direct writing using reduction of glyoxylic acid Co/Ni complexes 1 Hikaru Nakatani
- Poster Ultrafast pulse GHz burst mode laser ablation for efficient surface microprocessing 1 Ph.D. Francesc Caballero Lucas
- Poster *student* Development of hybrid laser system with blue diode laser and single mode fiber laser for welding of pure copper 1 Shumpei Fujio
- Poster *student* High stability of frequency and robustness of noise-like pulse fiber laser 1 Hitoshi Nakano
- Poster *student* Broadband pulsed fiber laser for suppression of stimulated Brillouin scattering 1 Tetsuya Yamazaki
- Poster Aligned growth of ZnO nanowires on diamond by nanoparticle-assisted pulsed laser deposition 1 Dr. Daisuke Nakamura
- Poster *student* Spectrometer-based Ultrashort Pulsed Laser Selective Microstructuring of Ni/NiCr Multi-layer Coatings 1 Chao He
- Poster *student* Femto- and nanosecond laser surface modification of stainless steel 1 Dipl.-Volkswirt Paulina Dzienny
- Poster Laser writing of waveguides in porous glass for small molecules detection 1 Dr. Roman Zakoldaev
- Poster *student* Homogeneous intensity within the Rayleigh length and enhanced depth of focus for Gaussian beams 1 Christian Bischoff
Session Chair


Session PS: Poster Session 01
Belongs to:
Topic PS: Poster Session


ZnO nanocrystals have been paid much attention owing to their unique optical and electrical properties, and ZnO nanocrystal-based optoelectronic devices have been reported. We have developed a catalyst-free growth method for aligned ZnO nanocrystals, named nanoparticle-assisted pulsed laser deposition (NAPLD) , and demonstrated Fabry–Pérot lasing from a single nanowire and high-sensitivity photosensor. However, the application of ZnO to homojunction diodes has been limited due to the difficulties of high quality p-type ZnO fabrication. As an alternative approach to utilize ZnO for optoelectronic applications, a ZnO/p-type material heterojunction structure has been suggested, and we have demonstrated ZnO nanowire/p-GaN film ultraviolet (UV) LED. Recently, diamond is attracting attention in combination with ZnO for photodetectors operated in the UV region because of its 5.47 eV band gap, highest thermal conductivity, high radiation resistance and good temperature stability. In this study, we synthesized ZnO nanowires on a diamond single crystal substrate by NAPLD, and investigated the structural and optical characteristics of the ZnO nanowires.

In the experiment, a sintered source target of ZnO was used. A diamond single crystal (100) substrate was put on a SiC heater in a vacuum chamber and the ZnO target was ablated with the third harmonics of a Q-switched Nd:YAG laser at 355 nm. Then, ZnO nanowires were grown on the diamond at background argon gas of 27 kPa and a laser fluence of 1 J/cm2 with a substrate temperature of 750 ºC for 20 minutes. Figure 1 shows the scanning electron microscope (SEM) images of the ZnO nanowires. The diameter of the aligned nanowires was about 100 nm. And they have wurtzite crystalline structure from X-ray diffraction measurement. A photoluminescence measurement under He-Cd laser (325 nm) excitation showed an UV emission centered at around 379 nm, which is the contribution of the near band edge emission of the wide band-gap ZnO, and weak broad visible emission attributed to the deep-level defects inside ZnO lattices. The results indicate a low concentration of deep-level defects inside ZnO lattices. Now, we are investigating dependence of orientation of the diamond substrate on the growth of the ZnO nanowires.

Speaker:
Dr. Daisuke Nakamura
Kyushu University
Additional Authors:
  • Rio Suzuki
    Kyushu University
  • Dr. Masafumi Inaba
    Kyushu University
  • Mitsuhiro Higashihata
    Kyushu University
  • Prof. Dr. Hiroshi Ikenoue
    Kyushu University

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