- Education:
1- Degree (Doctoral), Major: Electrical, magnetic and Optical Properties of condensed Matter.
Thesis Title:Thermoelectrical Bi2Se3-Bi2Te3Thin Films.
Date ofGraduation: 2016.
2-Degree (Master),Major: Natural Science (Physics).
Department of physics, Faculty of Science, Sohag University, Sohag, Egypt.
Thesis Title:Studies on Some Physical Properties of Bismuth Selenide Compound Doped withAntimony Element
Date ofGraduation: 2011.
3-Degree (Bachelor),Major: Natural Science, Physics.
Department of physics, Faculty of Science, SohagUniversity, Sohag, Egypt.
Date of Graduation: 2006.
4-Post doctorand senior lecturer at the National University of Science and Technology, Moscow, Russia,
Dates: 2016-2018.
Bi2Se3 bulk alloys were synthesized using a standard mono-temperature melting process and used as source materials to deposit thin films on non-conductive super cleaned glass substrates by a vacuum thermal evaporation technique. Both bulk and thin-film samples were polycrystalline as confirmed by X-ray diffraction patterns. The film samples were subjected to the annealing process in air atmosphere at 250 and ...
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PolycrystallinebulksamplesofBi2(Se1−xTex)3systemwithx=0.0–0.9werepreparedbythe conventionalmeltingmethod.Successfullyandcheaply,SeatomswerereplacedbyTeatomstoget Bi2Se3-Bi2Te3orevenBi2Te3alone.DifferenceofmassandsizebetweenTeandSeatomsisexpected toresultininterestingpropertiesintheBi2(Se1−xTex)3system.Allcompoundsshowedametalsemiconductorconductivitytransition.TheelectricalconductioninthepristineBi2Se3compound increaseswiththelowTedopingratio(x=0.3)thendecreasesmonotonicallyforfurtheramountsof Te.TheSeebeckcoefficientofBi2Se3compoundispositiveshowingupap-typeconduction.However, introducingTecontentincreasesthen-typeconductionwithadecreaseintheSeebeckcoefficient absolutevalue.Inaddition,Bi2Se3compoundisfoundtoexhibitrelativelyhighroomtemperature powerfactorandfigureofmeritvaluesof2.13μW/m.k2.Inanattempttodeterminethefigureof meritZT,Bi2Se3seemstobethebestforroomtemperature,whereas,Teadditionathighvaluesmakes thesystemjustsuitableforhightemperatureapplication
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Thin films of Bi-based chalcogenides were prepared by pulsed laser deposition (PLD) technique according to the stoichiometric formula: Bi2(Se1−xTex)3. Their optical properties were studied aiming to find the suitable area of application and the optimum composition amongst the samples under study. X-ray diffraction analysis proved the crystallinity of the deposited samples; in addition, surface roughness and films homogeneity were studied ...
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A material is any substance or mixture of substances that occupy a volume, and has a mass. A substance usually refers to pure compound. Appearance, behavior, name, structure, color, order, composition and any information about a substance are properties of a material. We most likely recognize a material by its appearance, sometimes aided by other senses such as touch, smell, ...
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An electric circuit is a closed loop made of conductors and other electrical elements through which electric current can flow. For example, a very simple electrical circuit consists of three elements: a battery, a lamp, and an electrical wire that connects the two.
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