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    Synthesis and Characterization of Cu2ZnSnS4 (CZTS)Thin Films Prepared by Pulsed Laser Deposition Technique

    , M.Sc. Thesis Sharif University of Technology Dabbagh, Mohammad Mahdi (Author) ; Mahdavi, Mohammad (Supervisor)
    Abstract
    The Cu2ZnSnS4 (CZTS) quaternary compound, with suitable optical and electrical properties, is one of the most interesting materials for absorber layer of thin film solar cell. Since all constituents of CZTS, are abundant in earth’s crust and non-toxic, it is a proper replacement for the materials like CdTe and CuInSe2. The CZTS pellet was synthesized by the solid-state reaction and deposited on soda lime glass substrates by pulsed laser deposition (PLD) method. PLD technique has the advantages of offering stoichiometric preservation during the materials transformation from target to substrate and good crystallinity due to the highly energetic species. CZTS has was deposited in order to... 

    Synthesis and Microstructure of Multi Valent Heavily Doped TiO2 Ceramics

    , M.Sc. Thesis Sharif University of Technology Motahari, Majid (Author) ; Nemati, Ali (Supervisor)
    Abstract
    In this project, the nanostructured titanium oxide with heaily doping of oxides of cerium and tin was synthesized using the sol-gel process and its properties were studied. To synthesize TiO2, titanium tetraisopropoxide precursor was used. Cerium nitrate and aqueous tin chloride precursors were utilized for cerium and tin synthesis. Then, they were mixed with Titania precursor causing a severe doping. After that, a gel was produced and it was aged and eventually, it was dried and calcined. XRD and SEM were used to determine the phase and particle size SEM and XRD results showed that doping had great impact on TiO2 crystals. The approximate size of nanoparticles was calculated using...