Superlattices and Microstructures (Superlattice Microst )


An Interdisciplinary Journal on the Science and Technology of Nanostructures. Superlattices and Microstructures is a journal devoted to the science and technology of synthetic microstructures, microdevices, surfaces and interfaces. The last decade has seen rapid developments in the fabrication, characterization and conceptual understanding of synthetic microstructures in many different material systems including silicon, III-V and II-VI semiconductors, metals, ceramics and organics. The objective of this journal is to provide a common interdisciplinary platform for the publication of the latest research results on all such"nanostructures" with dimensions in the range of 1 - 100 nm; the unifying theme here being the dimensions of these artificial structures rather than the material system in which they are fabricated.

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    Superlattices and Microstructures website
  • Other titles
    Superlattices and microstructures (Online), Superlattices and microstructures
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  • Document type
    Internet Resource, Computer File, Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: The optical and physical properties of AlGaN-based deep ultraviolet light-emitting diodes (UV LEDs) with various specific designs of staggered quantum wells (QWs) are numerically investigated. Detailed analysis has been carried out on the light output power, energy band, overlap of electron and hole wavefunctions, carrier concentration, radiative recombination rate, spontaneous radiative spectrum and internal quantum efficiency. The simulated results reveal that the deep UV LEDs with the staggered quantum wells exhibit better performance than their conventional counterpart due to the diminished piezoelectric polarization fields in QWs which can increase the density of electron and hole and the overlap of the electron and hole wavefunctions, and thus enhance the radiative recombination rate.
    Superlattices and Microstructures 11/2014; 75:63–71.
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    ABSTRACT: Plasma immersion ion implantation was used to dope nitrogen in ZnO thin films to achieve p-type films. The doped samples were subsequently annealed at temperatures between 700 °C and 1000 °C. A strong A°X peak around 3.35 eV was detected in the photoluminescence spectra for samples annealed at high temperatures. The p-ZnO films were stable after 9 months and were reproducible. The current–voltage relationship for a p–n heterojunction diode exhibited rectifying behavior with a built-in voltage of 1.6 V.
    Superlattices and Microstructures 11/2014; 75:9-16.
  • Superlattices and Microstructures 11/2014; 75:818–830.
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    ABSTRACT: The aim of this study was to prepare and characterize the poly (ε-caprolactone)/Mg-doped fluorapatite nanoparticles (PCL/nMg-FA) nanocomposite electrospun scaffolds. The effect of solvent type on distribution of nanoparticles and mechanical properties of the scaffolds was also investigated. The optimized nanofibrous scaffold was obtained by 5 wt.% nMg-FA while its tensile strength and elastic modules were significantly enhanced compered to PCL scaffolds. It is noteworthy that no surfactant was used in present study. The Mg-FA nanoparticles were homogeneously dispersed in the nanofibers and prepared scaffolds without any agglomeration.
    Superlattices and Microstructures 11/2014; 75:208–221.
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    ABSTRACT: Thermoelectric Bi2Se3/Bi multilayered nanowire arrays with a minimum period of about 100 nm were first successfully fabricated by a template-assisted pulsed electrodeposition process. And the effect of ion concentration on electrodeposition current was investigated by using the cyclic voltammogram. Meanwhile, the nanowires were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, high resolution transmission electron microscopy, and energy dispersive X-ray spectroscopy, respectively. Large-scale and continuous nanowire arrays with multi-segment characters and uniform diameters can be observed by FE-SEM and TEM, and the randomly selected neighboring segments were characterized to be Bi2Se3 and Bi, respectively, by EDS.
    Superlattices and Microstructures 10/2014; 74:273–278.
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    ABSTRACT: Zn2SnO4 nanocubes–SnO2 (ZTO(NC)–SnO2) and Zn2SnO4 nanoparticles–SnO2 (ZTO(NP)–SnO2) were successfully produced by a combination of sonochemical route in mixture solvents of different contents of ethylene glycol – de-ionized water and high temperature calcination. The phase and morphology were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). ZTO(NP)–SnO2 nanocomposites exhibit higher photocatalytic activity than ZTO(NC)–SnO2 through the degradation of methylene blue (MB) dye under UV light.
    Superlattices and Microstructures 10/2014; 74:173–183.
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    ABSTRACT: Simple theoretical models are proposed for the analytical and the numerical study of the exchange bias phenomenon in the layered systems with rough AFM/FM interface. It is shown that the qualitative type of the magnetization curves depend crucially on the variation of the roughness degree. We obtain that the magnetization curves are qualitatively of the same type in the cases of perfect and rough FM/AFM interfaces. The method which allow to identify the character of the interface (rough or perfect) is proposed.
    Superlattices and Microstructures 09/2014; 73:275–280.
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    ABSTRACT: The crystal structure and quality of ZnO thin films were enhanced by high temperature vacuum annealing. High quality ZnO thin films have been grown on a-plane sapphire substrate by radio frequency (rf) magnetron sputtering method at a substrate temperature of 600 °C. A remarkable improvement in the epilayer quality were established by in situ high temperature annealing. The film quality, smoothness, the in plane stress, and the degree of epitaxy of the films have been evaluated. The crystalline quality was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and Raman spectroscopy analyses. An extremely smooth ZnO films were achieved at higher annealing temperatures with root mean square roughness of 0.3 nm. The transverse optical mode A1(TO) observed in all the samples and the longitudinal optical mode A1(LO) appeared only at higher annealing temperatures over 800 °C in the micro-Raman scattering measurements. The strain of c-axis were relaxed and the lattice parameter was comparable to that of bulk ZnO at high annealing temperature of 900 °C.
    Superlattices and Microstructures 09/2014; 73:268–274.
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    ABSTRACT: Systematic investigations were performed on a set of AlInGaN epilayers which were grown by metalorganic chemical vapor deposition on sapphire with a thick (3 μ m) GaN intermediate layer. The chemical compositions (both In and Al contents) of AlInGaN layers were directly determined by Rutherford backscattering spectrometry and elastic recoil detection analysis. Using high resolution X-ray diffraction and the channeling scan around an off-normal 〈12¯13〉 axis in {101¯0} plane of the AlInGaN layers, the tetragonal distortion eT is determined. The results show that eT, ranging from negative to positive, is drastically influenced by the chemical composition in AlInGaN epilayers.
    Superlattices and Microstructures 09/2014; 73:232–238.
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    ABSTRACT: We present a new work on the development of electrodeposition route for synthesis of ternary ZnIn2S4 alloy. These thin films were grown on (ITO)-coated glass substrate from acidic plating bath containing Zinc (II) Chloride (ZnCl2), Indium Chloride (InCl3) and sodium thiosulfate (Na2S2O3) at room temperature. Prior to deposition, a cyclic voltammetry study was performed in binaries (Zn–S, In–S) and ternary (ZnIn2S4) systems. The influence of various deposition potentials on structural, morphological, optical, and electrical properties of samples was investigated. X-ray diffraction patterns of samples demonstrate the presence of major crystalline phase of ZnIn2S4 at an applied potential of −1050 mV versus Ag/AgCl. Energy band gap of samples determined from optical measurements has been estimated in the range of 1.90–2.50 eV. From atomic force microscopy (AFM) and scanning electron microscopy (SEM) analysis, it was found that surface morphology, grain size and roughness were strongly influenced by varying the deposition potentials. Electrochemical impedance spectroscopy data have been modeled using an equivalent circuit approach. Flat-band potential and free carrier concentration have been determined from Mott–Schottky plot and are estimated to be around −0.72 V and 1.46 × 1017 cm−3 respectively. The film was n-type semiconductor.
    Superlattices and Microstructures 08/2014;
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    ABSTRACT: Importance of synthesizing graphene-substrate hybrid structure to open a band gap in graphene and apply them in novel nanoelectronic devices is undeniable. Graphene/hexagonal boron-nitride (h-BN) hybrid bilayer is an important type of these structures. The synthesized h-BN/graphene is found to have interesting electrical properties which is very sensitive to the change of the interlayer distance. This has encourages researchers to tune the energy and band gap of such structures. A change in the interlayer distance can also alter the mechanical properties, considerably, due to the variation of interaction energies. The current study is aimed to characterize the mechanical properties variation with interlayer distance change for h-BN/graphene hybrid bilayer structure. To this end, density functional theory calculations are employed within the generalized gradient approximation (GGA) framework. The results demonstrate that there are different possible equilibrium interlayer distances between layers related to two types of layer configuration, i.e. AA and AB. It is found that increasing the interlayer distance causes reduction of Young’s modulus. Also, Young’s modulus of hybrid structure is approximately between those of graphene/graphene and h-BN/h-BN bilayer structures and also lower than pristine monolayer graphene and graphite. Unlike the pure bilayer structures, Poisson’s ratio of hybrid bilayer structure is found to be higher than those of pristine monolayer graphene and h-BN nanosheets.
    Superlattices and Microstructures 08/2014; 72:230–237.
  • Superlattices and Microstructures 08/2014; 72:352–369.
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    ABSTRACT: Linear and nonlinear intersubband optical absorption coefficients in quantum wells with asymmetrical semi-exponential potential are studied theoretically. We obtain unperturbed eigenfunctions and the energy eigenvalues by means of solving Schrödinger equation within the framework of effective mass approximation. The wave functions and energies with consideration of polaron are acquired through perturbation method. Besides, the analytic expressions of optical absorption coefficients are obtained using compact-density-matrix approach and iterative method. The results of calculation show that optical absorption is enhanced when effects of polaron are considered. Additionally, the parameters of confinement potential have great influences on optical absorption.
    Superlattices and Microstructures 08/2014;
  • Superlattices and Microstructures 08/2014; 72:283–295.
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    ABSTRACT: Critical dynamical transitional phases of electronic liquids driven by an initial electric field in a microscopic confined environment at low temperature regime could occur after we investigated by adopting the verified theory of absolute reactions. The critical temperatures related to the nearly frictionless transport of many condensed electrons might be directly relevant to the dynamical transition at low-temperature regime in amorphous materials, say (Bi2-xSrx)2CuO6, after selecting specific activation energies and activation volumes. We also address the normal-state high-temperature transport issue.
    Superlattices and Microstructures 05/2014;
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    ABSTRACT: In this work, the linear and nonlinear phonon-assisted cyclotron resonance (PACR) in a parabolic quantum well (PQW) under the applied electric field have been theoretically studied. General analytical expressions for the absorption power are obtained by using the perturbation approach. The effect of the electric field on PACR conditions is also indicated. We investigated numerically the dependence of PACR absorption spectrum as well as PACR-linewidth on the temperature, on the external electric and magnetic fields, and on confinement frequency. The results show that the PACR absorption spectrum is affected by the Landau levels, the electric subband levels and the electric field. Furthermore, external electric field results in increasing the possibility of the electron-phonon scattering, and plays an important role in the blue shift of PACR absorption spectrum.
    Superlattices and Microstructures 03/2014;