| 1. |
- Dhanabalan, D., et al.
(författare)
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Studies on Schottky Barrier Diodes Fabricated using Single-Crystal Wafers of β-Ga2O3 Grown by the Optical Floating Zone Technique
- 2022
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Ingår i: Physica status solidi. B, Basic research. - : Wiley. - 0370-1972 .- 1521-3951. ; 259:2
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Tidskriftsartikel (refereegranskat)abstract
- β-Ga2O3 is one of the most promising wide-bandgap materials for optoelectronic applications as well as a conducting substrate for GaN-based device technologies. Single crystals of undoped β-Ga2O3 are grown by the optical floating zone technique utilizing compressed dry air as growth atmosphere. The properties of β-Ga2O3 are highly anisotropic. Optimization of the processing recipe for wafers along different orientations suitable for device development is conducted. Structural, optical, and electrical properties of the wafers are determined. Efforts are made to fabricate Schottky diodes based on Pt/Ti/Au–β-Ga2O3–Ti/Au device structures. Devices are fabricated on (−201) cut wafers. The device characteristics are discussed in detail.
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| 2. |
- Mahmmoud Sayed, Abd El-sadek, et al.
(författare)
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CdTe@Cu(OH)(2) nanocomposite: Aqueous synthesis and characterization
- 2011
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Ingår i: Journal of Solid State Chemistry. - : Elsevier BV. - 0022-4596. ; 184:5, s. 1135-1140
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Tidskriftsartikel (refereegranskat)abstract
- CdTe@Cu(OH)(2) nanocomposites were synthesized in aqueous solution by a seed-mediated growth approach. The effect of refluxing time and the concentration of Cu2+ on the preparation of these samples were measured using UV-visible absorption and photoluminescence analysis. The emission peak of the synthesized nanocomposites (CdTe@Cu(OH)(2)) was shifted from 605 (CdTe seed) to 621 nm. The size of CdTe nanoparticles were averaged about 3.22 nm, and the CdTe@Cu(OH)(2) nanocomposites were averaged as 5.19 nm. The synthesized CdTe@Cu(OH)(2) nanocomposite were characterized with XRD, EDAX, TEM, FT-IR, EPR, and thermal analysis (TG/DTG curves). The results indicate that as-prepared nanoparticles with core/shell structure exhibit interesting optical properties. (C) 2011 Elsevier Inc. All rights reserved.
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| 3. |
- Mahmmoud Sayed, Abd El-sadek, et al.
(författare)
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Influence of different stabilizers on the optical and nonlinear optical properties of CdTe nanoparticles
- 2011
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Ingår i: Optics Communications. - : Elsevier BV. - 0030-4018. ; 284:12, s. 2900-2904
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Tidskriftsartikel (refereegranskat)abstract
- CdTe semiconductor nanocrystals were synthesized with three different stabilizers: Mercaptoacetic Acid (MM), Mercaptopropionic Acid (MPA) and 2-Mercaptoethanol (ME) at pH approximate to 11.2 by wet chemical route using potassium tellurite and cadmium chloride as starting materials. The effect of capping agent on the preparation of these samples was evaluated using UV-Visible absorption and photoluminescence analysis. With the same reaction time but with different stabilizers, nanocrystals of different diameters were obtained. The average full width at half maximum of the photoluminescence spectra was about 69 nm which indicates that the monodispersity was quite good. The particle size was calculated by Debye-Scherrer equation from XRD data. Further characterization studies such as FT-IR and optical nonlinearity studies on the samples were carried out and the results are discussed. (C) 2011 Elsevier B.V. All rights reserved.
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| 4. |
- Perumal, Rajagembu, et al.
(författare)
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Nucleation kinetics and growth aspects of glycine phosphite ferroelectric single crystals
- 2011
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Ingår i: Materials Chemistry and Physics. - : Elsevier BV. - 0254-0584 .- 1879-3312. ; 126:1-2, s. 381-385
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Tidskriftsartikel (refereegranskat)abstract
- The nucleation parameters of glycine phosphite (GPI) ferroelectric single crystal were estimated in an aqueous solution using the classical homogeneous nucleation theory. The solubility, metastable zonewidth and induction period were determined experimentally by employing gravimetric, polythermal and isothermal method respectively. The interfacial energy was determined using the induction period values and the same was used for the further evaluation of the nucleation parameters. It was observed that the nucleation rate increases with an increase in supersaturation and hence nucleation is more probable at a higher value of supersaturation. Bulk size GPI single crystals were grown using the optimized nucleation parameters. The crystalline perfection and the defects of the as grown specimens were studied and the obtained results have been presented in this paper.
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| 5. |
- Venkatesan, Dhanasekaran, et al.
(författare)
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Synthesis and Characterization of Sodium Bis(2-ethylhexyl) Sulfonsuccinate (AOT) Capped Pure and Mn-Doped CdS Nanoparticles
- 2012
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Ingår i: Journal of Nanomaterials. - : Hindawi Publishing Corporation. - 1687-4110 .- 1687-4129. ; , s. 492573-
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Tidskriftsartikel (refereegranskat)abstract
- CdS nanoparticles and thin films are well known for their excellent semiconducting properties. When transition metal ions are doped into the CdS, it exhibits magnetic properties in addition to semiconducting properties and they are termed as dilute magnetic semiconductors (DMSs). In this paper, we discuss the preparation of sodium bis(2-ethylhexyl) sulfonsuccinate (AOT) capped CdS nanoparticles and thin films doped with magnetic impurity Mn. Sodium bis(2-ethulexyl) sulfonsuccinate (AOT), capping agent promotes the uniform formation of nanoparticles. Optical characterizations are made using the UV-Vis spectrometer, PL, and FTIR. XRD shows the hexagonal structure of the CdS. SEM images and EDS measurements were made for the thin films. EPR shows the clear hyperfine lines corresponding to Mn2+ ion in the CdS nanoparticles.
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