EFFECT OF OXIDATION TIME UNDER HIGH MAG- NETIC FIELD ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF OXIDIZED Co-DOPED ZnO FILMS

doi:10.11900/0412.1961.2014.00376

Acta Metall Sin

2014, Vol. 50

Issue (12): 1538-1542 DOI: 10.11900/0412.1961.2014.00376

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EFFECT OF OXIDATION TIME UNDER HIGH MAG- NETIC FIELD ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF OXIDIZED Co-DOPED ZnO FILMS

LI Guojian, WANG Zhen, WANG Qiang, WANG Huimin, DU Jiaojiao, MA Yonghui, HE Jicheng

Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819

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LI Guojian, WANG Zhen, WANG Qiang, WANG Huimin, DU Jiaojiao, MA Yonghui, HE Jicheng. EFFECT OF OXIDATION TIME UNDER HIGH MAG- NETIC FIELD ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF OXIDIZED Co-DOPED ZnO FILMS. Acta Metall Sin, 2014, 50(12): 1538-1542.

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Abstract

The effects of the oxidation time under high magnetic field on the microstructure and optical properties of oxidized Co-doped Zn prepared by vacuum evaporation were studied by FESEM, XRD and ultraviolet visible spectrophotometer. The results show that the growth of coral dendritic structures of ZnO films is inhibited by high magnetic field. Spherical particles of ZnO film oxidized for 60 min without magnetic field transforms to leaf like morphologies with the application of a 6 T magnetic field. With increasing oxidation time under high magnetic field, the preferred orientation of (101) transforms to (002); distribution of magnetic Co atoms in ZnO is influenced; the band gap is decreased to the range of 2.95~3.13 eV. The transmittance is decreased by the spherical morphologies. However, it is increased by the application of high magnetic field. These results give a new method to tune the microstructure and optical properties of surface morphology, preferred orientation, magnetic atomic distribution, transmittance, and band gap.

Key words: ZnO film Zn oxide transmittance high magnetic field vacuum evaporation

ZTFLH:

TB303

Fund: Supported by National Natural Science Foundation of China (No.51101034), Fundamental Research Funds for the Central Universities (Nos.N130509002, N120609001 and N110809001)

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	Guojian LI
	Zhen WANG
	Qiang WANG
	Huimin WANG
	Jiaojiao DU
	Yonghui MA
	Jicheng HE

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00376 OR https://www.ams.org.cn/EN/Y2014/V50/I12/1538

Fig.1 SEM images of Co-doped ZnO films with different oxidation times with and without high magnetic field

Fig.2 XRD patterns of Co-doped ZnO films with different oxidation times

Fig.3 Transmission spectra of Co-doped ZnO films with different oxidation times

(a) 0 T (b) 6 T

Fig.4 (αhν)²-hν of Co-doped ZnO films with different oxidization times (α—light absorption coefficient, hν—incident photon energy)

(a) 40 min (b) 50 min (c) 60 min

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