Co Cluster Formation Induced by Cu Codoping in Co:ZnO Semiconductor Thin Films

被引:9
作者
Pan, Zhiyun [1 ]
Hu, Fengchun [1 ]
He, Shi [2 ]
Liu, Qinghua [1 ]
Sun, Zhihu [1 ]
Yao, Tao [1 ]
Xie, Yi [2 ]
Oyanagi, Hiroyuki [1 ,3 ]
Xie, Zhi [1 ]
Jiang, Yong [1 ]
Yan, Wensheng [1 ]
Wei, Shiqiang [1 ]
机构
[1] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China
[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Dept Nanomat & Nanochem, Hefei 230026, Anhui, Peoples R China
[3] AIST, Natl Inst Adv Ind Sci & Technol, Photon Res Inst, Tsukuba, Ibaraki 3058568, Japan
基金
中国国家自然科学基金;
关键词
MAGNETIC SEMICONDUCTORS; GIANT MAGNETORESISTANCE; ZNO NANOPARTICLES; FERROMAGNETISM; OXIDE; NANOCRYSTALS; SPINTRONICS;
D O I
10.1021/jp209985n
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Here we report that the occupation sites of Co atoms in ZnO matrix could be effectively tuned by the concentration of Cu codopant. The Co Cu codoping effect has been revealed by a combination of X-ray diffraction and Xray absorption fine structure spectroscopy techniques for Zn0.95-xCuxCo0.05O (0.005 <= x <= 0.08) thin films grown by pulse laser deposition at 923 K. Specifically, at the low Cu doping levels (x <= 0.02), the Co(+2) ions are substantially incorporated into the ZnO lattice; upon increasing the Cu concentration to 0.03 or higher, partial formation of Co(0) species occurs, and its proportion rises rapidly with the Cu concentration. Further analysis shows that the Cu codopants are precipitated to form Cu(0) metallic phase in all the samples. We propose a competition mechanism between the Co(0)-Cu(0) metallic interactions and the dissolution of Co ions in ZnO to interpret these findings.
引用
收藏
页码:4855 / 4861
页数:7
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