[TuP3G] Oxide Materials & Devices

[TuP3G-10] Properties of Needle-Shaped ZnO Crystals Using Zn(C₅H₇O₂)₂ Grown Under Atmospheric Pressure and Low Temperature Conditions

〇Jun Suzuki¹, Mio Sakuma¹, Yuji Imai¹, Koji Kawasaki¹, Yasuhiro Kashiwaba¹, Keiji Komatsu² (1. National Institute of Technology (KOSEN), Sendai College (Japan), 2. Nagaoka University of Technology (Japan))

This paper reports on the evaluation of various properties of needle-like crystals grown at atmospheric pressure and low temperature using Zn(C₅H₇O₂)₂, which yielded characteristics attributable to ZnO. For crystal growth, mass-production-friendly method under atmospheric pressure was employed. Characterization involved optical microscopy, photoluminescence (PL) analysis, and X-ray diffraction evaluation. Microscopy revealed needle-like crystals ranging from tens of micrometers to hundreds of micrometers in diameter. PL analysis revealed emission at room temperature, likely originating from ZnO band-edge luminescence, along with broad luminescence possibly mediated by impurity levels or lattice defect levels. X-ray diffraction also observed peaks characteristic of ZnO in the needle-like crystals. These results clearly demonstrate that ZnO can grow in a needle-like crystalline form even under ambient pressure and at low substrate temperatures.