Growth and characterization of high-quality nanostructures based on Al doped tin oxide (SnO2) prepared by electrochemical deposition method / Ikram Khemamil

Public ISBD Titre : Growth and characterization of high-quality nanostructures based on Al doped tin oxide (SnO2) prepared by electrochemical deposition method Type de document : document électronique Auteurs : Ikram Khemamil, Auteur ; Ibtissem Nehar, Auteur ; Kara, rania, Directeur de thèse Editeur : Setif:UFA Année de publication : 2025 Importance : 1vol. (52 f.) Catégories : Thèses & Mémoires:Chimie Mots-clés : Nanostructures, SnO2, Semiconductor, ITO, Electrodeposition, Doping. Résumé : Abstract In this work, we studied tin oxide (SnO2) nanostructures grown by electrodeposition on ITO substrates. We chose this technique because it is simple and easy to prepare. First, we studied the mechanisms of SnO2 electrodeposition using cyclic voltammetry and chronoamperometry. Mott- Schottky measurements showed that the deposits exhibit n-type conductivity with an increase in charge carrier concentration as Al doping increases, UV-Vis spectroscopy indicated the increase of the transmission and the gap energy using Al doping approach. Structural analysis by X-ray diffraction showed a tetragonal polycrystalline structure with preferential orientation along the (110) plane. Morphological characterization showed a noticeable change in topography with an increase in the roughness for doped films. Current-voltages plots of Au/Cu2O/SnO2/ITO heterojunctions showed the improvement of the electrical properties with Al doping. Note de contenu : Contents List of Figures ............................................................................................................................ I List of Tables ........................................................................................................................... III Abbreviation list ..................................................................................................................... â…£ General Introduction ............................................................................................................... 1 References ................................................................................................................................. 3 Chapter I: Literature Review I.1. Generalities on Photovoltaics ............................................................................................ 4 I.2. Tin Oxide (SnO2) ................................................................................................................ 5 I.3. Properties of Tin Oxide ..................................................................................................... 5 I.3.1. Crystallographic Properties of Tin Oxide ................................................................ 5 I.3.2. Electrical and Electronic Properties ......................................................................... 6 I.3.3. Optical Properties of Tin Oxide ................................................................................. 7 I.4. Tin Oxide Doping ............................................................................................................... 8 I.5. Fields of Application of SnO2 ............................................................................................ 9 I.5.1. Gas Detection ............................................................................................................. 10 I.5.2. Lithium Batteries ...................................................................................................... 10 I.5.3. Gas Sensors ................................................................................................................ 10 I.5.4. Photovoltaic Solar Cell ............................................................................................. 11 I.5.5. Photocatalysis Application ....................................................................................... 11 I.6. Tin Oxide (SnO2) Production Methods .......................................................................... 12 I.7. Electrodeposition Technique .......................................................................................... 12 I.7.1. Principle of Electrodeposition .................................................................................. 12 I.7.2. Electrodeposition Mechanism .................................................................................. 13 References ............................................................................................................................... 15 Chapter II :Experimental Conditions and Characterization Methods II.1. Experimental Setup ........................................................................................................ 20 II.1.1. Assembly and Electrochemical Cell ....................................................................... 20 II.1.2. Potentiostat/Galvanostat ......................................................................................... 20 II.1.3. Electrodes ................................................................................................................. 21 II.2. Substrates Preparation .................................................................................................. 21 II.3. Solutions Preparation .................................................................................................... 22 II.4. Preparation Conditions ................................................................................................. 23 II.5. Characterization Techniques ........................................................................................ 24 II.5.1. Cyclic Voltammetry ................................................................................................. 24 II.5.2. Mott-Schottky Measurements (M-S) ..................................................................... 25 II.5.3. X-Ray Diffraction (DRX) ........................................................................................ 26 II.5.4. UV-visible Spectrophotometry: .............................................................................. 28 II.5.5. Atomic Force Microscope (AFM): ......................................................................... 28 II.5.8. Current-Voltage Measurement .............................................................................. 30 References ............................................................................................................................... 32 Chapter III: Results and Discussion III.1.Electrodeposition Mechanism of Tin Oxide (SnO2) ................................................... 35 III.2. Chronoamperometric Study ........................................................................................ 35 III.3. Cyclic Voltammetry Study ........................................................................................... 36 III.3.1. Cyclic Voltammetry of ITO in the Supporting Electrolyte ................................ 36 III.3.2.Cyclic Voltammetry of ITO in the Presence of Sn Precursor ............................. 38 III.4.Mott-Schottky Analysis ................................................................................................. 39 III.5.UV-Vis Analysis ............................................................................................................. 41 III.6. Structural (XRD) Analysis ........................................................................................... 44 III.7. Morphological (AFM) Analysis ................................................................................... 47 III.8. Electrical (I-V) Analysis ............................................................................................... 48 References ............................................................................................................................... 50 General Conclusion ................................................................................................................ 52 Côte titre : MACH/0376 Growth and characterization of high-quality nanostructures based on Al doped tin oxide (SnO2) prepared by electrochemical deposition method [document électronique] / Ikram Khemamil, Auteur ; Ibtissem Nehar, Auteur ; Kara, rania, Directeur de thèse . - [S.l.] : Setif:UFA, 2025 . - 1vol. (52 f.). Catégories : Thèses & Mémoires:Chimie Mots-clés : Nanostructures, SnO2, Semiconductor, ITO, Electrodeposition, Doping. Résumé : Abstract In this work, we studied tin oxide (SnO2) nanostructures grown by electrodeposition on ITO substrates. We chose this technique because it is simple and easy to prepare. First, we studied the mechanisms of SnO2 electrodeposition using cyclic voltammetry and chronoamperometry. Mott- Schottky measurements showed that the deposits exhibit n-type conductivity with an increase in charge carrier concentration as Al doping increases, UV-Vis spectroscopy indicated the increase of the transmission and the gap energy using Al doping approach. Structural analysis by X-ray diffraction showed a tetragonal polycrystalline structure with preferential orientation along the (110) plane. Morphological characterization showed a noticeable change in topography with an increase in the roughness for doped films. Current-voltages plots of Au/Cu2O/SnO2/ITO heterojunctions showed the improvement of the electrical properties with Al doping. Note de contenu : Contents List of Figures ............................................................................................................................ I List of Tables ........................................................................................................................... III Abbreviation list ..................................................................................................................... â…£ General Introduction ............................................................................................................... 1 References ................................................................................................................................. 3 Chapter I: Literature Review I.1. Generalities on Photovoltaics ............................................................................................ 4 I.2. Tin Oxide (SnO2) ................................................................................................................ 5 I.3. Properties of Tin Oxide ..................................................................................................... 5 I.3.1. Crystallographic Properties of Tin Oxide ................................................................ 5 I.3.2. Electrical and Electronic Properties ......................................................................... 6 I.3.3. Optical Properties of Tin Oxide ................................................................................. 7 I.4. Tin Oxide Doping ............................................................................................................... 8 I.5. Fields of Application of SnO2 ............................................................................................ 9 I.5.1. Gas Detection ............................................................................................................. 10 I.5.2. Lithium Batteries ...................................................................................................... 10 I.5.3. Gas Sensors ................................................................................................................ 10 I.5.4. Photovoltaic Solar Cell ............................................................................................. 11 I.5.5. Photocatalysis Application ....................................................................................... 11 I.6. Tin Oxide (SnO2) Production Methods .......................................................................... 12 I.7. Electrodeposition Technique .......................................................................................... 12 I.7.1. Principle of Electrodeposition .................................................................................. 12 I.7.2. Electrodeposition Mechanism .................................................................................. 13 References ............................................................................................................................... 15 Chapter II :Experimental Conditions and Characterization Methods II.1. Experimental Setup ........................................................................................................ 20 II.1.1. Assembly and Electrochemical Cell ....................................................................... 20 II.1.2. Potentiostat/Galvanostat ......................................................................................... 20 II.1.3. Electrodes ................................................................................................................. 21 II.2. Substrates Preparation .................................................................................................. 21 II.3. Solutions Preparation .................................................................................................... 22 II.4. Preparation Conditions ................................................................................................. 23 II.5. Characterization Techniques ........................................................................................ 24 II.5.1. Cyclic Voltammetry ................................................................................................. 24 II.5.2. Mott-Schottky Measurements (M-S) ..................................................................... 25 II.5.3. X-Ray Diffraction (DRX) ........................................................................................ 26 II.5.4. UV-visible Spectrophotometry: .............................................................................. 28 II.5.5. Atomic Force Microscope (AFM): ......................................................................... 28 II.5.8. Current-Voltage Measurement .............................................................................. 30 References ............................................................................................................................... 32 Chapter III: Results and Discussion III.1.Electrodeposition Mechanism of Tin Oxide (SnO2) ................................................... 35 III.2. Chronoamperometric Study ........................................................................................ 35 III.3. Cyclic Voltammetry Study ........................................................................................... 36 III.3.1. Cyclic Voltammetry of ITO in the Supporting Electrolyte ................................ 36 III.3.2.Cyclic Voltammetry of ITO in the Presence of Sn Precursor ............................. 38 III.4.Mott-Schottky Analysis ................................................................................................. 39 III.5.UV-Vis Analysis ............................................................................................................. 41 III.6. Structural (XRD) Analysis ........................................................................................... 44 III.7. Morphological (AFM) Analysis ................................................................................... 47 III.8. Electrical (I-V) Analysis ............................................................................................... 48 References ............................................................................................................................... 50 General Conclusion ................................................................................................................ 52 Côte titre : MACH/0376

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