Physical properties of solution processable n-type Fe and Al co-doped ZnO nanostructured thin films: Role of Al doping levels and annealing

被引:61
作者
Goktas, A. [1 ]
Aslan, F. [1 ]
Yesilata, B. [2 ]
Boz, I. [1 ]
机构
[1] Harran Univ, Fac Arts & Sci, Dept Phys, TR-63300 Sanliurfa, Turkey
[2] Harran Univ, Mech Engn Dept, TR-63300 Sanliurfa, Turkey
关键词
Al and Fe co-doped ZnO thin films; Solution process; Annealing; Refractive index; Oxygen vacancy; Room temperature ferromagnetism; Grain boundary effect; SOL-GEL METHOD; MAGNETIC-PROPERTIES; SPRAY-PYROLYSIS; TEMPERATURE FERROMAGNETISM; GRAIN-BOUNDARIES; SEMICONDUCTORS; NANOCRYSTALS; BEHAVIOR; GROWTH; ROUTE;
D O I
10.1016/j.mssp.2017.11.033
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The role of annealing temperature and Fe and Al co-doping on structural, optical, electrical and magnetic properties of solution processable ZnO thin films were investigated. ZnO: Fe thin films fixed with 2% of typical ferrous component were obtained to examine the role of 1-10% Al doping. X-ray diffraction analyses clearly indicates that the films to be polycrystalline and preferentially oriented along the c-axis of the hexagonal wurtzite structure. The film thickness, homogeneous distribution and decreasing/increasing of grain size dependence on Al content/annealing temperature (TA) were assessed by scanning electron microscopy. X-ray photoelectron spectroscopy revealed that Al3+ and Fe2+ ions to substitute for Zn2+ without changing the wurtzite structure. A slight decrease in the optical band gap of ZnO at fixed Fe dopant and a considerable increase of the optical band gap with increased Al doping concentrations and TA were observed. The refractive index increases with the fixed Fe dopant level and then decreases by Al doping levels, whereas the extinction coefficient clearly increases depended on both of Fe and Al concentrations. The refractive index and extinction coefficient both decrease with TA. Hall measurements show n-type conductivity and the increase of charge carrier concentration by Al doping levels and TA. Magnetic studies indicate room temperature ferromagnetism in Al and Fe co-doped ZnO thin films, whereas no room temperature ferromagnetism for the Fe-doped ZnO thin films was observed. An enhanced room temperature ferromagnetism in Al and Fe co-doped ZnO thin films was observed to depend on T-A.
引用
收藏
页码:221 / 233
页数:13
相关论文
共 39 条
[1]   ELECTRICAL, OPTICAL AND ANNEALING CHARACTERISTICS OF ZNO-AL FILMS PREPARED BY SPRAY PYROLYSIS [J].
AKTARUZZAMAN, AF ;
SHARMA, GL ;
MALHOTRA, LK .
THIN SOLID FILMS, 1991, 198 (1-2) :67-74
[2]   Zn0.91CU0.04M0.05O (M = Ni, Co, Cr) nanocrystals: Structural study and energy gap tailoring [J].
Ashokkumar, M. ;
Muthukumaran, S. .
MATERIALS LETTERS, 2014, 131 :302-305
[3]   Effect of different dopant elements (Al, Mg and Ni) on microstructural, optical and electrochemical properties of ZnO thin films deposited by spray pyrolysis (SP) [J].
Benzarouk, Hayet ;
Drici, Abdelaziz ;
Mekhnache, Mounira ;
Amara, Abdelaziz ;
Guerioune, Mouhamed ;
Bernede, Jean Christian ;
Bendjffal, Hacen .
SUPERLATTICES AND MICROSTRUCTURES, 2012, 52 (03) :594-604
[4]   Properties of undoped n-type ZnO film and N-In codoped p-type ZnO film deposited by ultrasonic spray pyrolysis [J].
Bian, JM ;
Li, XM ;
Chen, LD ;
Yao, Q .
CHEMICAL PHYSICS LETTERS, 2004, 393 (1-3) :256-259
[5]   ANOMALOUS OPTICAL ABSORPTION LIMIT IN INSB [J].
BURSTEIN, E .
PHYSICAL REVIEW, 1954, 93 (03) :632-633
[6]   The effect of Al3+ co-doping on the structural, magnetic and optical properties of ZnCoO thin films [J].
Cao, P. ;
Bai, Y. ;
Zhao, D. X. ;
Shen, D. Z. .
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING, 2011, 14 (01) :73-77
[7]   Enhancement of room temperature ferromagnetism of Fe-doped ZnO epitaxial thin films with Al co-doping [J].
Chattopadhyay, S. ;
Nath, T. K. ;
Behan, A. J. ;
Neal, J. R. ;
Score, D. ;
Feng, Q. ;
Fox, A. M. ;
Gehring, G. A. .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2011, 323 (08) :1033-1039
[8]   ZnO:Al thin film gas sensor for detection of ethanol vapor [J].
Chou, Shih Min ;
Teoh, Lay Gaik ;
Lai, Wei Hao ;
Su, Yen Hsun ;
Hon, Min Hsiung .
SENSORS, 2006, 6 (10) :1420-1427
[9]   Ferromagnetism in Fe-doped SnO2 thin films [J].
Coey, JMD ;
Douvalis, AP ;
Fitzgerald, CB ;
Venkatesan, M .
APPLIED PHYSICS LETTERS, 2004, 84 (08) :1332-1334
[10]   Effect of atmosphere on the magnetic properties of the Co-doped ZnO magnetic semiconductors [J].
Cong, C. J. ;
Hong, J. H. ;
Zhang, K. L. .
MATERIALS CHEMISTRY AND PHYSICS, 2009, 113 (01) :435-440