Deep Raj, Yoshida Toshiyuki, Fujita Yasuhisa
Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan.
S-Nanotech Co-Creation Co., Ltd., 1060 Nishikawatsu, Matsue 690-0823, Japan.
Nanomaterials (Basel). 2024 Jun 5;14(11):977. doi: 10.3390/nano14110977.
In this study, the effect of defects on the acceptor properties of nitrogen-doped ZnO nanoparticles (NPs) was investigated through the fabrication of light-emitting diodes (LEDs). Nitrogen-doped ZnO NPs were synthesized by an arc discharge in-gas evaporation method and post-annealed at 800 °C in an oxygen and nitrogen atmosphere. The annealed ZnO NPs were characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and photoluminescence spectroscopy. It was found that the annealing of nitrogen-doped ZnO NPs in a nitrogen environment increased the number of zinc vacancies, while annealing in an oxygen environment increased the number of oxygen vacancies due to nitrogen desorption. The output characteristics of LEDs fabricated with oxygen-annealed NPs were degraded, while those with nitrogen-annealed NPs were significantly improved. From these results, the contribution of zinc vacancies to acceptor formation in ZnO NPs was confirmed for the first time in actual pn junction devices.
在本研究中，通过制造发光二极管（LED）研究了缺陷对氮掺杂氧化锌纳米颗粒（NPs）受主特性的影响。采用电弧放电气相蒸发法合成了氮掺杂氧化锌纳米颗粒，并在氧气和氮气气氛中于800℃进行了后退火处理。通过X射线衍射、扫描电子显微镜、拉曼光谱和光致发光光谱对退火后的氧化锌纳米颗粒进行了表征。结果发现，在氮气环境中对氮掺杂氧化锌纳米颗粒进行退火会增加锌空位的数量，而在氧气环境中退火由于氮脱附会增加氧空位的数量。用氧气退火的纳米颗粒制造的LED的输出特性下降，而用氮气退火的纳米颗粒制造的LED的输出特性则显著改善。从这些结果中，首次在实际的pn结器件中证实了锌空位对氧化锌纳米颗粒中受主形成的贡献。
