Abstract Diluted magnetic semiconductors (DMS) have emerged as promising candidates for spintronic devices, offering a unique combination of semiconducting and magnetic properties. In the present study, ZnO (Z) and Zn0.2Cu0.8O (C) nanostructured materials were synthesized using sol–gel and co–precipitation methods, respectively. Their composite, ZnO: Zn0.2Cu0.8O (ZC), was fabricated to investigate the structural and electrical properties. X–ray diffraction (XRD) analysis confirms the hexagonal wurtzite phase and reveals a reduced crystallite size and suppressed lattice strain across the lattice of ZC composite, as compared to the pure phases (i.e. Z & C). Rietveld refinements and Williamson–Hall (W–H) analysis further established changes in lattice parameters and strain effect. The dielectric constant, measured for a frequency range between 20 Hz and 2 MHz, shows a significant enhancement in its values for composite material which can be attributed to the interfacial polarization and oxygen vacancies. Impedance spectroscopy reveals lower impedance in the ZC composite indicating better conduction pathways due to enhanced defect density and grain boundary interactions. AC conductivity, analyzed using Jonscher's power law, demonstrates that the correlated barrier hopping (CBH) mechanism governs the conduction, with ZC composite sample exhibiting the highest conductivity among all the three samples. These findings suggest that the composite exhibits improved dielectric and electrical performance due to synergistic effects between ZnO and Zn0.2Cu0.8O phases, making it a promising material for electronic and optoelectronic applications.
Hybrid nanostructured Metal Oxide Semiconductor (MOS) capacitor was fabricated on silicon substrates (n-type) using chemical solution deposition with YMnO3 as an oxide layer. Electrical properties of MOS capacitor have been investigated with frequency dependence capacitance-voltage (C-V) characterization. The surface morphology of deposited layer was studied using the Atomic Force Microscopy (AFM). Hysteresis in the C-V loop and change in the values of Cminimum were described by a charge trap mechanism in the multiferroic oxide layer of MOS devices. While anomalous behavior in saturation capacitance in the inversion as well as in accumulation region and a shift in threshold voltage (V T ) were explained in the vicinity of frequency depended Debye length (L Debye ).
Cr-doped ZnO (0.6 molarity) nanosized particles are synthesized by sol–gel dip coating method on borosilicate glass tube. The structural and optical characterization of the particles has been investigated by TEM, SEM, UV–Vis and FTIR spectroscopy. TEM reveals that the Cr-doped ZnO occurs in uniform surface growth along with spherical in shape having size ∼3 nm. The SEM image shows the growth of nanostructured cluster (average size 75 nm) with large surface area. The UV–Vis spectrum of nanoparticles suggests the use of such nanostructured coating for better solar energy harvesting. FT-IR results show the structural and optical correlation of nanoparticles. This observation excludes the presence of any other Cr or ZnO concerned impurity. The present investigation, deals with potential applications toward the motivation for using nanostructured materials in solar energy conversion.
Herein, the bipolar resistive switching of Y 0.95 Sr 0.05 MnO 3 (YSMO) film grown on a Si substrate by pulsed laser deposition is reported. The mixed valent state of Mn ions with the presence of oxygen vacancies is confirmed by near‐edge X–ray absorption fine structure. The temperature‐dependent mobility and other switching parameters are extracted using Murgatroyd expression and a space charge–limited mechanism in the high‐resistance state. The YSMO thin film shows better resistive switching as the switching layer (a layer close to a positively biased electrode) thickness decreases. The bipolar resistive switching of the film suggests a strong dependence on localized switching thickness and temperature.
The magnetoelectric (ME) properties of sol–gel grown BiFe[Formula: see text]Co[Formula: see text]O 3 (BFCO) nanoceramics, with different sizes, were investigated at room-temperature. X-ray diffraction (XRD) measurement was performed to investigate structural properties of the samples understudy. Magnetic field-dependent dielectric permittivity has been systematically investigated in the frequency range of 20 Hz to 1 MHz. To ensure the origin of magnetodielectric response, the magnetoimpedance (MI) spectroscopy was adopted using equivalent circuit model. The a.c. conductivity was found to obey the Jonscher’s universal power law. The modifications in spiral spin structure in the BFCO nanoparticles with size less than [Formula: see text]62 nm significantly affect the ME coupling parameters.
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