扩散诱导的锌间隙相关施主缺陷对ZnO纳米棒结构及光电特性的影响  

Effect of diffusion-inducedzinc interstitial-related donor defects on the structure,electrical and optical properties of ZnO nanorods

作　　者：雷宗霖 张毓哲 丁科 张红 叶利娟 李泓霖 熊元强 李万俊 LEI Zonglin;ZHANG Yezhe;DING Ke;ZHANG Hong;YE Lijuan;LI Honglin;XIONG Yuanqiang;LI Wanjun(Chongqing Key Laboratory of Photo-Electric Functional Materials, College of Physics andElectronic Engineering, Chongqing Normal University, Chongqing 401331, China)

机构地区：[1]重庆师范大学物理与电子工程学院,光电功能材料重庆市重点实验室,重庆401331

出　　处：《功能材料》2021年第3期3214-3220,共7页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(11904041);重庆市自然科学基金资助项目(cstc2020jcyj-msxmX0533);重庆市教育委员会科学技术研究项目(KJQN202000511)。

摘　　要：采用射频磁控溅射技术和水浴法在SiO2单晶衬底上生长了Zn纳米颗粒/ZnO纳米棒复合材料(Zn/ZnO)。后期热处理促使Zn/ZnO界面之间发生元素相互扩散,直接向ZnO纳米棒中引入额外锌杂质,从而获得了富锌的ZnO纳米棒材料。借助扫描电子显微镜、X射线衍射仪、霍尔测试仪、分光光度计和拉曼光谱仪研究了富锌ZnO纳米棒的形貌、结构以及光电特性。结果表明,所有ZnO纳米棒均呈整齐的六角纤锌矿结构,相比ZnO纳米棒,富锌纳米棒具有相对较差的结晶质量,较好的导电性,较低的透射率和较窄的禁带宽度。拉曼光谱研究表明,通过扩散法向ZnO纳米棒引入的锌间隙相关施主缺陷,是其拉曼光谱中出现异常的275 cm^(-1)振动模的来源,也是导致富锌ZnO纳米棒微结构以及光电特性显著变化的主要原因。In this paper,Zn nanoparticles and ZnO nanorod composites(Zn/ZnO)are grown on SiO2 single crystal substrates by radio frequency magnetron sputtering and hydrothermal method.The post-annealing technique is applied to promote inter-diffusion at the interface of Zn/ZnO,and Zn impurities are directly introduced into the ZnO nanorods to obtain Zn-rich ZnO nanorods.The microstructural,electrical and optical properties of Zn-rich ZnO nanorods are studied by means of scanning electron microscopy,X-ray diffraction,Hall measurements,UV-vis-IR spectrophotometry,and Raman scattering spectroscopy.The results show that Zn-rich ZnO nanorods are still in a hexagonal wurtzite structure.Compared with prestine ZnO nanorods,Zn-rich nanorods have worse crystalline quality,lower transmittance,narrower bandgap and better electrical conductivity.It is demonstrated that these changes in properties are inseparable from the diffusion-induced Zn interstitial related donor defects.Our work further confirms that Zn interstitial related donor defect is the origin of abnormal 275 cm^(-1)Raman vibration mode observed in ZnO materials.

关 键 词：ZNO纳米棒 275 cm^(-1)振动模 锌间隙相关缺陷 光电特性 

分 类 号：O474[理学—半导体物理]