【摘要】 利用X射线吸收谱(XAFS)和X射线光电子能谱(XPS)等技术研究了共掺杂原子(Li,Cu,Cr)对Co原子在Co掺杂ZnO薄膜中分布形式的影响.在共掺杂前,Co原子以替代Zn原子的替代位和金属Co团簇两种形式存在.共掺杂Cr原子后,样品中的Co团簇消失,掺杂的Co原子只以替代位的形式分布在ZnO基体中.与之相反,共掺杂Cu(Li)原子后,样品中的Co团簇含量显著增加.进一步分析表明,共掺杂的Cr原子与Cu(Li)对Co原子分布形式具有截然不同的调控作用是与共掺杂原子在ZnO基体中的空间占位特点密切相关.更多还原

【Abstract】 X-ray absorption fine structure( XAFS) and X-ray photoelectron spectroscopy( XPS) were combined to study the effect of( Cr,Cu,Li) codopants on the distribution of magnetic Co atoms in Co-doped ZnO thin films.For the single-doping of Co in ZnO,there are two occupation sites of Co in ZnO: the substitutional sites for Znand metallic Co clusters. After Cr doping,the metallic Co clusters vanish and all the Co atoms occupy the substitutional sites. On the contrary,Cu( Li)-codoping further increases the content of metallic Co clusters. In-depth analysis suggests that the distinct roles of Cr and Cu( Li) codopants for mediating the distribution of Co atoms in ZnO are intimately related to the occupation sites of codopants.更多还原