Pravin M. Tirmali; Sagar M. Mane; Snehal L. Kadam; Shrinivas B. Kulkarni
Abstract
The double perovskite materials show the magnetic semiconductor, magneto-optic and magneto-capacitance like interesting properties. It is predicted that the B-site substitution in this system may results in interesting properties. La2Ni1-xFexMnO6 thin films are deposited on Pt/Ti/ Si(100) substrate ...
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The double perovskite materials show the magnetic semiconductor, magneto-optic and magneto-capacitance like interesting properties. It is predicted that the B-site substitution in this system may results in interesting properties. La2Ni1-xFexMnO6 thin films are deposited on Pt/Ti/ Si(100) substrate by Pulse Laser Deposition (PLD) technique. The films were uniform, fine grain and stoichiometric deposited at very low O2 pressure. The XRD of La2Ni1-xFexMnO6 thin films exhibits rhombohedral (R-3) phase. The peak broadening appears in Raman spectra at antistretching (518 cm -1 ) and stretching (656 cm -1 ) modes with presence of overtone modes at 1308 cm -1 in La2Ni1-xFexMnO6 thin film samples. XPS analysis reveals the presence of La 3+ , NiO, Ni 3+ , Fe 3+ , Mn 3+ and oxygen vacancies in samples. The Ni 3+ and Mn 3+ antiferromagnetic coupling is responsible for decrease in saturation magnetization Ms from 4.78 to 2.74 µB/f.u as Fe substitution increases from 0.1 to 0.3 at 5K. The increase in grain size, peak broadening and decrease in magnetization of La2Ni1-xFexMnO6thin film samples suggest presence of antisite defects and antisite phase boundary. The present work will helpful to study the effect of B site substitution on La2NiMnO6 thin films structural, electronic and magnetic properties in order to make it suitable candidate for potential applications.
Abhay Kumar Singh; R. Ganesan; Jong Tae Park
Abstract
Next-generation high-performance heterojunction photovoltaic (PV) modules can be fabricated with an appropriate active layer material. Therefore, it is worth to examine physical properties of the recent developed Cu25(In16Ga9)Se40Te10 (CIGST) material for the potential photovoltaic application. This, ...
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Next-generation high-performance heterojunction photovoltaic (PV) modules can be fabricated with an appropriate active layer material. Therefore, it is worth to examine physical properties of the recent developed Cu25(In16Ga9)Se40Te10 (CIGST) material for the potential photovoltaic application. This, report demonstrates the structural, optical and electrical properties of the 8000 and 16000 pulses deposited CIGST films on top of the ITO coated soda lime substrate (CIGST/ITO/substrate); whereas, the substrate temperature was 550 0 C. The 16000 pulses deposited thin film surface roughness (45 nm) and thickness (~1.4 μm) are obtained lower and higher than the 8000 pulses thin film. The cross sectional EDS elemental mapping also gives the fewer interlayer inclusions for the 8000 pulses deposited thin film. With the increasing thin films thicknesses a distinguishable UV/Visible peak shift toward the high wavelength side and enhance in optical energy band gap (1.13 and 1.2 eV) are noticed. Device fabricated (CIGST/ITO/substrate) with the 16000 pulses have a sharp current growth upto 2.0 × 10 -2 amp with a lower resistance under the applied voltage range 0-20V. The internal (IQE) and external (EQE) quantum efficiencies charge carriers transport for the fabricated devices are also discussed.
Gagan Dixit; J.P. Singh; R.C. Srivastava; H.M. Agrawal; R.J. Chaudhary
Abstract
In the present work, structural, morphological, magnetic and optical properties of nickel ferrite thin films having different thickness are reported. All the films were deposited on Si (100) substrate by pulsed laser deposition technique. Thicknesses of the films determined by x-ray reflectivity vary ...
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In the present work, structural, morphological, magnetic and optical properties of nickel ferrite thin films having different thickness are reported. All the films were deposited on Si (100) substrate by pulsed laser deposition technique. Thicknesses of the films determined by x-ray reflectivity vary from 62 to 176nm as the deposition time varies from 16 min to 40 min. The films were characterised by x-ray diffractogram, Fourier transform infrared (FTIR) and Raman spectroscopy for structural and phase confirmation. FTIR and Raman spectra confirm mixed spinel nature of nickel ferrite. Surface morphology is studied by Atomic force microscopy. All the films have granular nature. Magnetic properties were studied by vibrating sample magnetometer and magnetic hysteresis curves were recorded for all the films at room temperature and at10K. At 10K, saturation magnetisation was found to increase while coercivity deceases with thickness. The results are explained on the basis of anisotropy induced by cation inversion and strain. Optical properties were studied by UV-vis reflectance spectra. The value of optical band gap (5.7eV) was found to be independent of thickness of the film.
