MBE growth of ZnO layers on sapphire employing hydrogen peroxide as an oxidant

Bakin, A.; El-Shaer, Abdelhamid; Mofor, A. Che; Kreye, M.; Waag, A.; Bertram, F.; Christen, J.; Heuken, M.; Stoimenos, J.

doi:10.1016/j.jcrysgro.2005.10.033

Cited by 40 publications

(23 citation statements)

References 16 publications

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“…In the initial stage of growth a thin layer of MgO was deposited at a substrate temperature of 600 C, followed by a thin layer of ZnO at 300 C. Subsequent annealing led to a smooth surface morphology and intermixing of the two layers. 21,22 Then, the MgZnO layers under consideration were grown on this MgO/ZnO double-buffer according to the growth process described in Ref. 22.…”

Section: Samples and Experimental Detailsmentioning

confidence: 99%

Optical properties of MgZnO alloys: Excitons and exciton-phonon complexes

Neumann

Cobet

Esser

et al. 2011

Journal of Applied Physics

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The characteristics of the excitonic absorption and emission around the fundamental bandgap of wurtzite Mg x Zn 1Àx O grown on c-plane sapphire substrates by plasma assisted molecular beam epitaxy with Mg contents between x ¼ 0 and x ¼ 0.23 are studied using spectroscopic ellipsometry and photoluminescence (PL) measurements. The ellipsometric data were analyzed using a multilayer model yielding the dielectric function (DF). The imaginary part of the DF for the alloys exhibits a pronounced feature which is attributed to exciton-phonon coupling (EPC) similar to the previously reported results for ZnO. Thus, in order to determine reliable transition energies, the spectral dependence is analyzed by a model which includes free excitonic lines, the exciton continuum, and the enhanced absorption due to EPC. A line shape analysis of the temperature-dependent PL spectra yielded in particular the emission-related free excitonic transition energies, which are compared to the results from the DF line-shape analysis. The PL linewidth is discussed within the framework of an alloy disorder model.

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Section: Samples and Experimental Detailsmentioning

confidence: 99%

Optical properties of MgZnO alloys: Excitons and exciton-phonon complexes

Neumann

Cobet

Esser

et al. 2011

Journal of Applied Physics

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“…The growth of the latter heterostructures by means of MBE and MOCVD has been reported. [1][2][3][4][5][6][7][8][9][10]20 The fabrication of p-type ZnO has also been reported by employment of different growth techniques. However, the realization of light emitting diodes (LEDs) has only been demonstrated for epilayer materials grown by MBE, 21,22 MOCVD, 23 and hybrid beam deposition.…”

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confidence: 99%

Properties of shallow donors in ZnMgO epilayers grown by metal organic chemical vapor deposition

Zhao¹,

Liu²,

Holtz³

2014

Journal of Applied Physics

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Influence of thermally diffused aluminum atoms from sapphire substrate on the properties of ZnO epilayers grown by metal-organic chemical vapor deposition J. Vac. Sci. Technol. A 29, 03A106 (2011) The grown samples were investigated by x-ray photoelectron spectroscopy and photoluminescence. The magnesium (Mg) concentration was varied between 0% and 3% in order to study the properties of shallow donors. The free and donor bound excitons could be observed simultaneously in our high quality Zn 1Àx Mg x O epilayers in the photoluminescence spectra. The results indicate that both built-in strain and Mg-concentration influence the donor exciton binding energy. It clearly shows that the donor exciton binding energy decreases with increasing Mg-concentration and with increasing built-in strain. Furthermore, the results indicate that the donor bound exciton transition energy increases with decreasing strength of the built-in strain if the Mg-concentration is kept the same in the Zn 1Àx Mg x O epilayers. V C 2014 AIP Publishing LLC.

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“…Until now several research groups attempted to obtain experimental evidence for such ferromagnetism in thin films form of ZnO doped with transition metals. Thin Films of ZnO and ZnO-related compounds have been grown by a wide a variety of chemical as well as physical methods: sol-gel synthesis [3], chemical vapour deposition [4], magnetron sputtering [5], molecular beam epitaxy (MBE) [6] and Pulsed Laser Deposition [7]. In this work we report the analysis of plasma generated by pulsed laser ablation using fundamental wavelength (1064 nm) of Nd:YAG (neodymium-doped yttrium aluminum garnet) laser.…”

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confidence: 99%

Correlation between the OES Plasma Composition and ZnMnO films properties during Pulsed Laser

Riascos

Ramírez

Franco

2014

J. Phys.: Conf. Ser.

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Abstract. Manganese doped zinc oxide was ablated on (100) silicon using the fundamental harmonics of Nd:YAG laser at various oxygen ambient gas pressures and temperature substrate was kept at room temperature during the deposition. In all experiments we used ZnMnO target. Optical emission spectroscopy (OES) is used to survey the plasma composition during deposition. The intensities of the ZnI and ZnII emission lines are correlated to the oxygen gas pressure and composition and morphology of the films deposited. Strong emission lines of ZnI, Zn II and neutral oxygen are observed. Oxygen and Mn emission lines in its atomic or ionic states have not been detected in this investigation, which is thought ZnMnO as being exclusively produced on the substrate surface and not generated into the plasma, which is in agreement with previous studies of ZnO plasma plume. Atomic Force Microscopy (AFM) is used to study the influence of oxygen gas pressure on the ZnMnO film morphology. An X-ray diffraction was tried to verify a crystal structure of the sample. We have demonstrated that gas pressure is an important parameter for the quality and performances of ZnMnO structures obtained by pulsed laser deposition.

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MBE growth of ZnO layers on sapphire employing hydrogen peroxide as an oxidant

Cited by 40 publications

References 16 publications

Optical properties of MgZnO alloys: Excitons and exciton-phonon complexes

Optical properties of MgZnO alloys: Excitons and exciton-phonon complexes

Properties of shallow donors in ZnMgO epilayers grown by metal organic chemical vapor deposition

Correlation between the OES Plasma Composition and ZnMnO films properties during Pulsed Laser

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