Co掺杂ZnO的快中子辐射损伤研究  

Radiation damages to Co-doped ZnO single crystals by 2.5 MeV neutrons

作　　者：王云波[1] 李公平[1] 李天晶[1] 高行新[1] 

机构地区：[1]兰州大学核科学与技术学院,兰州730000

出　　处：《核技术》2010年第7期526-531,共6页Nuclear Techniques

基　　金：国家自然科学基金项目(10375028);兰州大学磁学与磁性材料教育部重点实验室开放课题(MMM200827);教育部留学回国人员科研启动基金

摘　　要：用中子发生器上D-D反应的2.5MeV中子辐照Co掺杂ZnO和对照样品纯ZnO单晶。室温下测量了样品的X射线衍射谱、光致发光谱和透射光谱。结果表明,快中子辐照后的纯ZnO单晶中引入了氧空位(VO)和氧错位(OZn)缺陷,且有少量的锌填隙(Zni)和氧填隙(Oi)缺陷。Co掺杂ZnO中存在的Co以及钴氧化物纳米团簇由于快中子轰击而分解消失。快中子与替代Zn2+的Co2+的碰撞导致大量的Co2+离开ZnO晶格点位,导致Co掺杂ZnO中引入钴填隙杂质和锌空位(VZn)缺陷。中子辐照后的所有样品依然呈纤锌矿结构并沿c轴高度择优取向。表明纯ZnO和掺Co氧化锌半导体材料具有良好的抗辐照性能,在空间器件方面具有应用潜力,且有助于在ZnO点缺陷方面的研究。Co-doped ZnO and as-grown ZnO single crystals were irradiated by 2.5 MeV neutrons from D-D reaction on a neutron generator, and the structural and optical properties were investigated by X-ray diffraction （XRD）, photoluminescence （PL） and optical transmittance at room temperature. The results indicated that a great number of defects of oxygen vacancies （Vo） and antisite oxygen （OZn） were introduced in the as-grown ZnO, and a few defects of interstitial zinc （Zni） and interstitial oxygen （Oi） were introduced after irradiation. The nanoclusters of metallic cobalt and cobalt oxides in the Co-doped ZnO disappeared after the neutron irradiation, and a great many Co^2＋ ions substituted for Zn^2＋ ions moved away probably from the lattice site due to the fast-neutron collision. The defects of interstitial cobalt impurities and zinc vacancies （VZn） were formed in the Co-doped ZnO irradiated by fast neutrons. The fast-neutron-irradiated samples are still ofwurtzite structure and in c-axis orientation. This work shows that ZnO and Co-doped ZnO semiconductors have great radiation hardness, hence their potential of space applications, and the findings are of help in studying point defects of ZnO.

关 键 词：ZNO单晶 Co掺杂的ZnO 快中子辐照 缺陷 

分 类 号：O483[理学—固体物理]