模拟寿命谱分析ZnO正电子寿命  

Positron lifetime evaluation of ZnO from simulated lifetime spectra

作　　者：李泽智 李辉[1] 王柱[2] 

机构地区：[1]太原理工大学物理与光电工程学院,太原030024 [2]武汉大学物理科学与技术学院,武汉430072

出　　处：《中国科技论文》2015年第17期2054-2058,共5页China Sciencepaper

基　　金：国家自然科学基金资助项目(11405115;11275142)

摘　　要：为研究寿命分解对 ZnO 缺陷寿命影响，模拟了 ZnO 中空位浓度在1015～1018 cm－3的含 Zn 空位、Zn 空位氢复合体、Zn＋O 双空位的 ZnO 正电子寿命谱并进行拟合分解。结果表明：当存在多于1种空位型缺陷浓度时，正电子寿命谱仍能很好地分解成2个寿命成分；当多于2种缺陷同时存在时，2个寿命拟合分解出的正电子寿命将出现虚拟寿命；仅利用体寿命模型评价正电子寿命谱分解过程是否合理并不十分可靠，需结合具体情况来判断拟合分解的结果是否具有物理意义。本文研究结果有助于在数据处理上分析 ZnO 中存在的具有争议的正电子体寿命及空位寿命。To investigate the influence of lifetime spectra decomposition on the positron lifetime of ZnO,positron lifetime spectra of ZnO having defects of Zn vacancy,Zn-vacancy-hydrogen complex,Zn＋O divacancy with concentrations from 1015 cm-3 to 1018 cm-3 are simulated.The obtained lifetime spectra is well decomposed into two components even if more than one type of defect exist.The two lifetime components fitting will yield artificial positron lifetime components in more than two type of defect sys-tems.The bulk lifetime model for evaluating the validity of lifetime spectra decomposition alone is not reliable,and will lead to improper interpretation of positron lifetime components.The present work is helpful to analyze controversial positron lifetimes of bulk and vacancies in ZnO from the viewpoint of lifetime data treatment.

关 键 词：正电子寿命 空位缺陷 ZNO 

分 类 号：O469[理学—凝聚态物理] O483[理学—电子物理学]