Growth and photoluminescence properties of inclined ZnO and ZnCoO thin films on SrTiO3(110) substrates

doi:10.1088/1674-1056/21/5/057801

Abstract ZnO thin film growth prefers different orientations on the etched and unetched SrTiO₃(STO)(110) substrates. Inclined ZnO and cobalt-doped ZnO (ZnCoO) thin films are grown on unetched STO(110) substrates using oxygen plasma assisted molecular beam epitaxy, with the c-axis 42° inclined from the normal STO(110) surface. The growth geometries are ZnCoO[100]//STO[1$\bar{1}$0] and ZnCoO[1$\bar{1}$1]//STO[001]. The low temperature photoluminescence spectra of the inclined ZnO and ZnCoO films are dominated by D⁰X emissions associated with A⁰X emissions, and the characteristic emissions for the ²E(²G)→⁴A₂(⁴F) transition of Co²⁺ dopants and the relevant phonon-participated emissions are observed in the ZnCoO film, indicating the incorporation of Co²⁺ ions at the lattice positions of the Zn²⁺ ions. The c-axis inclined ZnCoO film shows ferromagnetic properties at room temperature.

Keywords: inclined ZnO SrTiO₃(110) photoluminescence

Received: 21 December 2011
Revised: 27 April 2012
Accepted manuscript online:

PACS:	78.55.-m	(Photoluminescence, properties and materials)
	81.15.-z	(Methods of deposition of films and coatings; film growth and epitaxy)
	81.20.-n	(Methods of materials synthesis and materials processing)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2009CB929202) and the National Natural Science Foundation of China (Grant Nos. 10834001 and 51125004).

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Bai Hong-Liang(白洪亮), Liu Guo-Lei(刘国磊), He Shu-Min(贺树敏), Yan Shi-Shen(颜世申), Zhu Da-Peng(朱大鹏), Guo Hong-Yu(郭红雨), Ji Zi-Wu(冀子武), Yang Feng-Fan(杨丰帆), Chen Yan-Xue(陈延学), and Mei Liang-Mo(梅良模) Growth and photoluminescence properties of inclined ZnO and ZnCoO thin films on SrTiO₃(110) substrates 2012 Chin. Phys. B 21 057801

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Growth and photoluminescence properties of inclined ZnO and ZnCoO thin films on SrTiO3(110) substrates

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Growth and photoluminescence properties of inclined ZnO and ZnCoO thin films on SrTiO₃(110) substrates