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Physical properties of cerium doped-yttrium iron garnet ultrathin films for photovoltaic application
摘要： In this study, cerium incorporated yttrium iron garnet ultrathin films (CexY3-xFe5O12) (where x = 0, 0.1, 0.3, and 0.5) were prepared by the sol-gel method, spin coating technique, and heat treatment on quartz substrates. The effect of Ce on structural properties, morphology of thin films surface, and optical properties was explored by X-ray diffraction (XRD), field emission microscopy (FESEM), and atomic force microscopy (AFM). According to the XRD results, the films were crystalline with the cubic phase, while the FESEM indicated the YIG nanoparticles with approximately spherical shapes. The growth process of crystallite in YIG nanoparticles was investigated by X-ray peak broadening. The Williamson-Hall (W–H) analysis was utilized to maintain the contributions of crystallite size on the peak broadening of Ce:YIG nanoparticles. The structural features of thin films such as strain and stress for all of the peaks of XRD were accurately determined from the uniform deformation model (UDM) according to the YIG cubic phase. According to the AFM pictures, it seemed that thin films had a continuous and smooth surface. The absorption and transmission were measured in the visible and infrared region from 400 to 1200 nm.
关键词： Structural features,Cerium yttrium iron garnet thin films,Photovoltaic application,Optical properties,Sol-gel
更新于2025-09-12 10:27:22
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[All]-S,S-dioxide Oligo-Thienylenevinylenes: Synthesis and Structural/Electronic Shapes From Their Molecular Force Fields
摘要： Oligo-S,S-dioxothienylenevinylenes have been prepared by transferring oxygens to the sulfur atoms using the HOF?CH3CN complex. Their photophysical properteis are presented in comparison with their thiophenevinylene congeners together with their vibrational properties and molecular force fields permiting the interpretation of the alteration of aromaticity and inter-ring exocyclic π-conjugation in this series.
关键词： force fields,Raman spectroscopy,electronic/structural features,sulfur dioxides,oligothienylene vinylene
更新于2025-09-09 09:28:46
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Al-doped Ag2S nanostructures: ultrasonic synthesis and physical properties
摘要： Un- and aluminum (Al)-doped silver sulfide (Ag2S) nanostructures were grown by the sonochemical method. The samples were studied by employing various identification methods including X-ray diffraction (XRD), field emission electron microscopy (FESEM), photoluminescence (PL), Raman and UV-Visible. The results showed that adding Al dopant shifts the diffraction peaks to higher angles and reduces their intensity. Furthermore, the size of the nanocrystal was reduced compared to the undoped sample. It was found that the strain in the doped samples is greater than the un-doped sample by the use of Hall-Williamson (W-H) method. FESEM images demonstrate the composition of spherical forms of nanostructures, which is converted to a quadrilateral shape by adding dopant. PL analysis illustrated the presence of emission bands in the visible region that was resulted by the emission of the near band edge (NBE), as well as the percentage of the density and type of defects. Moreover, Al reduced the optical energy band gap of the nanostructures. Finally, the influence of the parameters affecting the crystalline and the optical properties of the material over the growth process was investigated using Raman analysis.
关键词： Al-doped Ag2S nanostructures,Structural features,Sonochemical,Optical properties
更新于2025-09-04 15:30:14