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, Periodical, Internet resource
  • Document type
    Internet Resource, Computer File, Journal / Magazine / Newspaper

Publications in this journal

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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.
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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: 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;
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    ABSTRACT: Oxidative annealing in air or reductive annealing in vacuum around 773 K of thermally evaporated gallium oxide films produces monoclinic β-Ga2O3 films of distinctly different compositional, optical, morphological and electrical properties. The pristine films prepared by the evaporation of Ga2O3 powders are oxygen deficient, amorphous and absorbing in UV-visible region. The air annealed films are transparent (band gap ∼4.9 eV), display nanometric granular morphology and are characterized by <1.0 eV extrinsic and 1.2-1.6 eV intrinsic activation energies in the Arrhenius plots of electrical conductivity. The growth of Ga2O3 phase on vacuum annealing takes place through the decomposition of Ga2O, one of the constituents of the pristine films. The vacuum annealed films exhibit comparatively lower transparency (band gap <4.5 eV), comprise micron-sized dendrites or fibres and have <1.0 eV extrinsic and 1.7-2.0 eV intrinsic activation energies. The incorporation of these properties results from compositional changes in films induced by annealing in air or vacuum ambient.
    Superlattices and Microstructures 01/2014;
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    ABSTRACT: ZnMoO4 with different morphologies were successfully synthesized by microwave hydrothermal and microwave solvothermal methods, without the use of any additives. The different crystalline phases (α-ZnMoO4, β-ZnMoO4 and ZnMoO4·0.8H2O), morphologies and optical properties of the samples were studied by X-ray diffraction, electron microscopy and spectroscopy, and were found to be influenced by the length of reaction time and the different volume ratios of ethylene glycol (EG) to water as medium solvents. In this research, the direct energy gap (Eg) and photonic emission wavelength were evaluated to be 3.13–3.51 eV and 366 nm, respectively.
    Superlattices and Microstructures 01/2014;
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    ABSTRACT: The paper presents a sol-gel approach for deposition of ZnO:Ag composite films. The films are obtained by spin coating method on quartz and Si substrates. The effect of the annealing temperatures (500-800°C) and the gas ambient (oxygen, nitrogen) has been studied by X-Ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR). Optical properties are investigated by UV-VIS spectroscopy. The transmittance spectra of ZnO:Ag films are differed from ZnO spectra and manifest absorption features due to silver nanoparticles formation.
    Superlattices and Microstructures 01/2014;
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    ABSTRACT: The electron spectrum of graphene superlattice is shown to be modified under the high-frequency electric field. Using this modified electron spectrum d’Alembert equation is written for the electromagnetic waves propagating in the graphene superlattice. Under certain conditions the d’Alembert equation is shown to take the form of double sine-Gordon equation. The solutions corresponding to the solitary electromagnetic waves are obtained. The shapes of these waves are shown to depend on the amplitude of the high-frequency electric field.
    Superlattices and Microstructures 01/2014;
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    ABSTRACT: CuAlO2 films with different thickness were prepared by the radio frequency magnetron sputtering technique. The structural, electrical and optical properties of CuAlO2 were studied by X-ray diffraction, atomic force microscope, UV–Vis double-beam spectrophotometer and Hall measurements. The results indicate that the single phase hexagonal CuAlO2 is formed and the average grain size of CuAlO2 films increases with increasing film thickness. The results also exhibit that the lowering of bandgap and the increase of electrical conductivity of CuAlO2 films with the increase of their thickness, which are attributed to the improvement of the grain size and the anisotropic electrical property. According to the electrical and optical properties, the biggest figure of merit is achieved for the CuAlO2 film with the appropriate thickness of 165 nm.
    Superlattices and Microstructures 01/2014;
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    ABSTRACT: A series of nickel selenides (NiSe and NiSe2) has been successfully synthesized from the reaction of SeCl4 with NiCl2⋅6H2O in the presence of cetyltrimethyl ammonium bromide (CTAB) as surfactant and hydrazine hydrate (N2H4⋅H2O) as reductant at 180 °C for 12 h through a simple hydrothermal method. The morphology, phase structure and composition of NixSey can be controlled by adjusting the Ni/Se ratio of the raw materials, the quantity of reductant, the reaction temperature and so forth. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS) analysis. It was found that when the ratio of Ni/Se is 1:1 or 3:2, flower-like assemblies of NiSe nanosheets are formed, at 180 °C for 12 h. When the ratio of Ni/Se is 1:2 at 180 °C, the products are found to be the mixture of hexagonal NiSe and cubic NiSe2. With decrease of nickel content in molar ratio of 1:2 (Ni:Se), nanospheres are agglomerated and microstructures are formed. With the reaction temperature decreasing from 180 °C to 120 °C, we reach pure NiSe2 nanoparticles. The formation mechanism of the nickel selenides has been investigated in detail by means of XRD and SEM analyses.
    Superlattices and Microstructures 01/2014; 65:79–90.
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    ABSTRACT: Novel caltrop-like ZnO nanostructures have been synthesized on Si (100) substrates using a simple carbon thermal method at 1050°C. Structure characterizations indicate that the as-prepared nanostructures have a single crystalline wurtzite structure preferentially oriented in the [0001] direction. Cathodoluminescence measurements of ZnO nanostructures exhibit an intensive ultraviolet peak at 384 nm and four broad green peaks (at 492, 504, 524 and 524 nm, respectively), which can be attributed to the free exciton emission and the deep level emission, respectively. The prominent optical properties of the caltrop-like ZnO nanostructures make them promising candidates for fabricating optoelectronic nanodevices. A possible growth mechanism is also discussed.
    Superlattices and Microstructures 01/2014;
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    ABSTRACT: This paper introduces a novel reduced body charge technique in nanoscale partially depleted (PD) SOI MOSFETs by an P+-type embedded silicon region inside the buried oxide and beneath source and channel regions. The embedded region creates a proper path to release the body accumulated holes easily. Actually, the P+ embedded and N+ active silicon regions constitute an Esaki tunnel diode to release the body accumulated holes by tunnel current. This work has investigated the main characterizations such as the kink effect, short channel effects (SCEs), leakage current, gate induced drain leakage (GIDL), self-heating effect, subthreshold swing, voltage gain, unilateral power gain, and current gain which all of them show the superiority of our structure when compared with a conventional SOI MOSFET (C-SOI) in reliable low-voltage applications. All the achieved numerical results have been extracted by two-dimensional and two-carriers simulator ATLAS.
    Superlattices and Microstructures 01/2014; 72:111–125.
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    ABSTRACT: Thin films of Zn0.95Mn0.05O were synthesized by RF- sputtering in nitrogen gas environment. Structural, optical and mechanical properties of the films with thickness ranging from 398 to 1650 nm are studied. The X-ray diffraction (XRD) results show that the as- deposited films are oriented along the (0 0 2) direction with hexagonal wurtzite structure. The field emission scanning electron microscopy (FESEM) studies show an increase in grain size with increase in thickness. Optical transmission studies show band gap values in the range 3.03–3.37 eV. The values of hardness and Young’s modulus are found to be in the range 14–18 GPa and 122–167 GPa at an indentation depth of 100 nm respectively. The role of nitrogen doping on the microstructure and properties of films is discussed.
    Superlattices and Microstructures 01/2014; 72:164–171.
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    ABSTRACT: First-principles calculations are performed to study the structural, electronic and magnetic properties of pure and C atom doped AlN nanoribbons with both zigzag edge (ZAlNNR) and armchair edge (AAlNNR). With the substitution of one N (Al) atom by a single C atom, a local expansion (a local contraction) takes place, and the C atom is preferred to substituting an edge N or Al atom in 7-ZAlNNR or 7-AAlNNR. Furthermore, by substituting C atom at different postions, the systems may turn into magnetic semiconductors or show a metallic character, which may open a way to design magnetic nanodevices based on AlNNR.
    Superlattices and Microstructures 01/2014;
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    ABSTRACT: Transmission oscillations of the ballistic spin transport through an extended spin field-effect transistor (SFET) are investigated. To the system of the normal incident electrons passing through the SFET between two normal leads, the transmission coefficients and the corresponding Landauer–Büttiker conductance can be obtained analytically. From the results it can directly find that the transport properties are obviously modulated by the spin of the incident electrons, the type and intensity of the spin–orbit coupling, the potentials strength, as well as the width of the SFET.
    Superlattices and Microstructures 01/2014; 73:322–329.

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