ZnO/(Zn)MgO polar and nonpolar superlattices

Gorczyca, I.; Skrobas, Kazimierz; Christensen, N. E.; Sajkowski, J.M.; Stachowicz, M.; Teisseyre, H.; Kozanecki, A.

doi:10.1063/1.5085055

Cited by 15 publications

(9 citation statements)

References 20 publications

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“…The QWs peak shows a pronounced blue shift due to the positive quantum confinement effect and the absence of internal polarization field. The high FWHM value originates from the thin well thickness and the wavy interface [31]. The variation of degree of polarization with temperature is shown in Fig.…”

Section: Resultsmentioning

confidence: 93%

Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn_1-xMg_xO multiple quantum wells grown on LiGaO₂ substrate

et al. 2020

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The temperature-dependent polarized photoluminescence spectra of nonpolar ZnO samples were investigated by 263 nm laser. The degree of polarization (DOP) of m-plane quantum wells changes from 76% at 10 K to 40% at 300 K, which is much higher than that of epilayer. The strong anisotropy was presumably attributed to the enhanced confinement effect of a one-dimension confinement structure formed by the intersection of quantum well and basal stacking fault. The polarization of laser beam also has an influence on the DOP. It is assumed that the luminescence polarization should be affected not only by the in-plane strains but also the microstructural defects, which do modify the electronic band structure.

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Section: Resultsmentioning

confidence: 93%

Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn_1-xMg_xO multiple quantum wells grown on LiGaO₂ substrate

et al. 2020

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“…Modifications of bandgaps can be realized in similar SLs by varying layer thicknesses . Calculations by Gorczyca at al . revealed a good agreement of the theoretical values of the band gaps with the experimental data for ZnO/MgO structures grown on c-, m-, and a- orientations of the ZnO substrates …”

Section: Introductionmentioning

confidence: 77%

“…Such structures can be called ordered alloys or quasi-ternary alloys. Modifications of bandgaps can be realized in similar SLs by varying layer thicknesses . Calculations by Gorczyca at al .…”

Section: Introductionmentioning

confidence: 99%

Short-Period CdO/MgO Superlattices as Cubic CdMgO Quasi-Alloys

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Dłużewski

et al. 2020

Crystal Growth & Design

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New perspective cubic quasi-alloy {CdO/MgO} m short-period superlattices (SLs) were grown on r-plane sapphire substrates by plasma-assisted molecular beam epitaxy. The quality of crystals was characterized using high resolution X-ray diffraction and transmission electron microscopy (TEM) techniques. X-ray diffraction confirmed the cubic structure of the samples and the presence of peaks corresponding to the SLs with period ranging from 0.6 to 5 nm. Reciprocal space maps around the (200) and (412) Bragg reflections were collected to analyze the strain in the SLs layers with very high precision. Local lattice parameters were measured by digital processing of experimental HRTEM images. From TEM and small-angle X-ray, thicknesses and growth rates of individual layers of MgO and CdO have been extracted. We found that thicknesses of the CdO and MgO layers influence the measured band gap. Surface roughness parameters for SLs were obtained by both small-angle X-ray diffraction and atomic force microscopy study.

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“…The use of superlattices can allow much more precise control of the composition, and good-quality ternary alloys in a wide range of compositions can be obtained in many semiconductor systems [ 2 , 5 , 12 , 13 ]. Band gap engineering, crucial for the design of optoelectronic devices, can be realized in SLs by varying the layer thicknesses [ 3 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…Most recent theoretical works are based on density functional theory calculations and are devoted mainly to the properties of binary compounds of CdO and MgO, including investigation of structural [23][24][25], electronic [26], spectroscopic [27], optical [28][29][30], magnetic [31][32][33][34][35] or other properties of doped compounds [36][37][38], Gorczyca et al [13,14] have conducted band gap engineering investigations of ZnO/MgO SL. No theoretical investigation of CdO/MgO superlattices has been reported in the literature, and this fact motivated us to study them.…”

Section: Introductionmentioning

confidence: 99%

The Band-Gap Studies of Short-Period CdO/MgO Superlattices

et al. 2021

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Trends in the behavior of band gaps in short-period superlattices (SLs) composed of CdO and MgO layers were analyzed experimentally and theoretically for several thicknesses of CdO sublayers. The optical properties of the SLs were investigated by means of transmittance measurements at room temperature in the wavelength range 200–700 nm. The direct band gap of {CdO/MgO} SLs were tuned from 2.6 to 6 eV by varying the thickness of CdO from 1 to 12 monolayers while maintaining the same MgO layer thickness of 4 monolayers. Obtained values of direct and indirect band gaps are higher than those theoretically calculated by an ab initio method, but follow the same trend. X-ray measurements confirmed the presence of a rock salt structure in the SLs. Two oriented structures (111 and 100) grown on c- and r-oriented sapphire substrates were obtained. The measured lattice parameters increase with CdO layer thickness, and the experimental data are in agreement with the calculated results. This new kind of SL structure may be suitable for use in visible, UV and deep UV optoelectronics, especially because the energy gap can be precisely controlled over a wide range by modulating the sublayer thickness in the superlattices.

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ZnO/(Zn)MgO polar and nonpolar superlattices

Abstract: The effect of post-growth rapid thermal annealing on InAs/InGaAs dot-in-a-well structure monolithically grown on Si

Cited by 15 publications

References 20 publications

Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn_1-xMg_xO multiple quantum wells grown on LiGaO₂ substrate

Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn_1-xMg_xO multiple quantum wells grown on LiGaO₂ substrate

Short-Period CdO/MgO Superlattices as Cubic CdMgO Quasi-Alloys

The Band-Gap Studies of Short-Period CdO/MgO Superlattices

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ZnO/(Zn)MgO polar and nonpolar superlattices

Abstract: The effect of post-growth rapid thermal annealing on InAs/InGaAs dot-in-a-well structure monolithically grown on Si

Cited by 15 publications

References 20 publications

Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn1-xMgxO multiple quantum wells grown on LiGaO2 substrate

Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn1-xMgxO multiple quantum wells grown on LiGaO2 substrate

Short-Period CdO/MgO Superlattices as Cubic CdMgO Quasi-Alloys

The Band-Gap Studies of Short-Period CdO/MgO Superlattices

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Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn_1-xMg_xO multiple quantum wells grown on LiGaO₂ substrate

Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn_1-xMg_xO multiple quantum wells grown on LiGaO₂ substrate