Abstract Bulk ZnO crystals were grown by self-selecting CVT method using carbon as the transport agent. The crystal growth process took place on the top of the polycrystalline source material, and deep-red colored ZnO crystals of several millimeters were obtained. The as-grown crystals were characterized by X-ray diffraction (XRD), Energy Dispersive Spectrometer (EDS), Raman scattering (RS) spectroscopy, visible–near infrared (VIS–NIR) spectrophotometer and room temperature photoluminescence (PL) spectroscopy. XRD results indicate good crystallinity of the ZnO crystal. The EDS analysis shows that the crystal has a stoichiometry ratio Zn: O = 52: 48. The results suggest the existence of native defects of oxygen vacancies (OV) in the as-grown ZnO samples, which is caused by the stoichiometry shift to Zn-rich.

中文翻译：

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自选 CVT 法生长块状 ZnO 晶体

摘要 采用碳作为传输剂，采用自选CVT法生长了块状ZnO晶体。晶体生长过程发生在多晶源材料的顶部，获得了几毫米的深红色 ZnO 晶体。通过 X 射线衍射 (XRD)、能谱仪 (EDS)、拉曼散射 (RS) 光谱、可见-近红外 (VIS-NIR) 分光光度计和室温光致发光 (PL) 光谱对生长的晶体进行表征。XRD结果表明ZnO晶体具有良好的结晶度。EDS 分析表明，该晶体的化学计量比为 Zn:O = 52:48。结果表明，在生长的 ZnO 样品中存在氧空位 (OV) 的天然缺陷，这是由于化学计量向 Zn 的转变造成的-富有的。