1. Growth and photoluminescence properties of inclined ZnO and ZnCoO thin films on SrTiO3(110) substrates.
- Author
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Bai Hong-Liang, Liu Guo-Lei, He Shu-Min, Yan Shi-Shen, Guo Hong-Yu, Ji Zi-Wu, Yang Feng-Fan, Chen Yan-Xue, and Mei Liang-Mo
- Subjects
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PHOTOLUMINESCENCE , *ZINC oxide , *THIN films , *SUBSTRATES (Materials science) , *MOLECULAR beam epitaxy , *FERROMAGNETISM - 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[11¯0] and ZnCoO[11¯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. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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