The effects of thermal annealing on properties of MgxZn1−xO films by sputtering

Li, Hui; Zhang, Yongzhe; Pan, Xiaojun; Wang, Tao

doi:10.1016/j.jallcom.2008.04.018

Cited by 19 publications

(18 citation statements)

References 17 publications

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“…Consistent with earlier reports a higher density of edge-type than screw-type dislocations is observed [8,21,31,32] [7,[15][16][17][18].…”

Section: Comparison Tosupporting

confidence: 92%

“…However, such wz-Mg x Zn 1-x O films with high MgO-concentrations are metastable and thus thermal annealing affects their structural and optical properties as it can cause a separation of the rs-and wz-Mg x Zn 1-x O phases on the way to equilibrium. The microscopic details of these widely recognized phase separation processes in the Mg x Zn 1-x O system have only been sparsely addressed [7,[15][16][17][18] and phase separation is generally considered as a hardly controllable process which is responsible for the thermal instability of ternary compounds and results in the deterioration of the structural, optical, and electronic properties. …”

Section: Introductionmentioning

confidence: 99%

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Self-assembly of ordered wurtzite/rock salt heterostructures—A new view on phase separation in MgxZn1−xO

Gries

Wassner

Vogel

et al. 2015

Journal of Applied Physics

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This version is available at https://strathprints.strath.ac.uk/54019/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Transmission electron microscopy reveals that these effects are caused by phase separation leading to the formation of a vertically ordered rock salt/wurtzite heterostructures. To explain these observations we suggest a phase separation epitaxy model that considers this process being initiated by the formation of a cubic (Mg,Zn)Al 2 O 4 spinel layer at the interface to the sapphire substrate, acting as a planar seed for the epitaxial precipitation of rock salt-type Mg x Zn 1-x O. The equilibrium fraction x of magnesium in the resulting wurtzite (rock salt) layers is approximately 0.15 (0.85), independent of the MgO content of the as-grown layer and determined by the annealing temperature. This model is confirmed by photoluminescence analysis of the resulting layer systems after different annealing temperatures. In addition we show that the thermal annealing process 2 results in a significant reduction in the density of edge-and screw-type dislocations, providing the possibility to fabricate high quality templates for quasi-homoepitaxial growth.3

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“…Consistent with earlier reports a higher density of edge-type than screw-type dislocations is observed [8,21,31,32] [7,[15][16][17][18].…”

Section: Comparison Tosupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Self-assembly of ordered wurtzite/rock salt heterostructures—A new view on phase separation in MgxZn1−xO

Gries

Wassner

Vogel

et al. 2015

Journal of Applied Physics

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“…The experiment procedure had been reported in the previous paper [13]. Mg x Zn 1-x O films were sputtered in different ambient condition, which is a mixture of Ar and O 2 with different ratio.…”

Section: Methodsmentioning

confidence: 99%

“…However, the change of band gap by modulating Mg content in films is still a controversial problem by magnetron sputtering, which is the most common method for preparing ZnO based films. Therefore, our group endeavored to investigate the properties of Mg x Zn 1-x O films by sputtering, and have reported some interesting results [12,13].…”

Section: Introductionmentioning

confidence: 99%

Composition-dependent properties of Mg<inf>x</inf>Zn<inf>1−x</inf>O films by sputtering

Liu

Xie

2011

2011 Second International Conference on Mechanic Automation and Control Engineering

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The properties of Mg x Zn 1-x O films dependent on composition were studied in this paper. The experiment showed that the composition of films prepared by sputtering was affected by ambient condition and annealing temperature. The increasing Mg content was in favor of increasing crystal quality of films, and didn't change the wurtzite structure of films. The band gap changed between 3.4 and 4.0 eV, which was dependent on Mg content in films and consistent well with the previous reported theory on alloyed films. These results above showed that Mg x Zn 1-x O films by sputtering could be used as barrier layers in ZnO-based heterostructures.

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“…With increasing the Mg content, both the enhancement [3][4][5] and weakening [6,7] of the visible emission intensity were observed. In [3][4][5][6]8], the shift of defect-related emission band toward the short wavelength side as a result of alloying ZnO with MgO was found, whereas in [9,10] any change of emission band shape or peak position was not observed. In [11], it was shown that self-activated defect-related emission in sol-gel MgZnO phosphors can be shifted from the orange to green-blue spectral region by changing the annealing temperature and gas ambient.…”

Section: Introductionmentioning

confidence: 99%

Influence of Mg content on defect-related luminescence of undoped and doped wurtzite MgZnO ceramics

Маркевич¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Undoped as well as Li-, Ag-, Cu-and Zn-doped Mg x Zn 1-x O ceramics with x = 0-0.20 were sintered at 1000 °C. Defect-related photoluminescence (PL) and PL excitation spectra were measured at room temperature in 400-800 nm and 250-400 nm spectral ranges, accordingly. Two types of PL bands were observed: i) the bands, spectral positions of which were not influenced by the Mg content (Cu-related as well as selfactivated orange and red ones); ii) the bands, spectral positions of which exhibited some blueshift with increasing Mg content (Li-and Ag-related and self-activated green ones). It has been shown that used doping gives the possibility to obtain the phosphor with intense visible emission within the blue-yellow spectral range.

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The effects of thermal annealing on properties of MgxZn1−xO films by sputtering

Cited by 19 publications

References 17 publications

Self-assembly of ordered wurtzite/rock salt heterostructures—A new view on phase separation in MgxZn1−xO

Self-assembly of ordered wurtzite/rock salt heterostructures—A new view on phase separation in MgxZn1−xO

Composition-dependent properties of Mg<inf>x</inf>Zn<inf>1−x</inf>O films by sputtering

Influence of Mg content on defect-related luminescence of undoped and doped wurtzite MgZnO ceramics

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The effects of thermal annealing on properties of MgxZn1−xO films by sputtering

Cited by 19 publications

References 17 publications

Self-assembly of ordered wurtzite/rock salt heterostructures—A new view on phase separation in MgxZn1−xO

Self-assembly of ordered wurtzite/rock salt heterostructures—A new view on phase separation in MgxZn1−xO

Composition-dependent properties of Mg<inf>x</inf>Zn<inf>1&#x2212;x</inf>O films by sputtering

Influence of Mg content on defect-related luminescence of undoped and doped wurtzite MgZnO ceramics

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Composition-dependent properties of Mg<inf>x</inf>Zn<inf>1−x</inf>O films by sputtering