| Titre : | Study of diluted magnetic semiconductor Co and Cu co-doped ZnO thin films |
| Auteurs : | saoud tayeb, Auteur ; Said Benramache, Directeur de thèse |
| Type de document : | Thése doctorat |
| Editeur : | Biskra [Algérie] : Faculté des Sciences Exactes et des Sciences de la Nature et de la Vie, Université Mohamed Khider, 2025 |
| Format : | 1VOL.(638.p) / ill.couv.ill.en coul / 30cm |
| Langues: | Anglais |
| Langues originales: | Anglais |
| Résumé : |
Using a spray pneumatic technique, cobalt (Co) and copper (Cu) co-doped zinc oxide thin films were effectively deposited on a glass substrate. The goal of this work was to create a semiconductor with good optical and electrical properties by co-doping ZnO thin films with Cu and Co. The ZnO thin films obtained from the Co and Cu co-doping exhibit patterns of x-ray diffraction spectra that suggest they are hexagonal ZnO (wurtzite, JCPDS 36-1451). The thin film elaborated with 2 % Co and 7 % Cu has the lowest value of crystallite size (D = 14.67 nm). The transmission spectra demonstrate that all films have good optical transparency in the visible spectrum, with 7 % Cu achieving the highest transmission. Increasing Cu contents raised the band gap energy. The value at the minimum was 3.31 eV. The optical band gap’s broadening is a significant characteristic of advanced materials and may be useful in applications involving metal oxide nanostructures for visible light gas sensing |
| Sommaire : |
Acknowledgements I Dedications II Table of contents III List of figures VI List of tables IX General introduction 1 Chapter I:Transparent Conductor I.1. Introduction: 4 I.2. transparent conducting oxides 4 I.3. History of Transparent Conducting Oxides 5 I.4. types of Transparent Conductors 6 I.5. TCOs Material Applications 8 I.5.1. Transistors and Flexible Transparent Electronics 8 I.5.2. Electro chromic Windows 9 I.5.3. Optical Arrays 10 I.5.4. photovoltaic cells (PV) 11 I.6. Zinc oxide (ZnO) Properties 13 I.6.1. fundamentals 13 I.6.2. Structural Properties 14 I.6.3. Optical Properties 15 I.6.4. Electrical properties 17 I.7. Review of doped and co-doped zinc oxide thin films 17 I.8. Major applications of zinc oxide thin films 17 I.9. THIN FILM DEPOSITION METHODS 18 I.9.1. Physical deposition techniques 19 I.9.2. Chemical deposition techniques 20 I.9.3. Spray pyrolysis 20 I.10. Conclusion 22 References 23 CHAPTER II :Thin Films Elaboration and Characterization II.1. Introduction 32 II.2.1. Spray Technique 32 II.2.2. Mechanism 32 II.2.3. Advantages of the Spray 33 II.2.4. Disadvantage of the Spray pyrolisis 34 II.3. Defining Deposition Parameters 34 II.4. Preparation 34 II.4.1. Solution preparation 34 II.4.2. The substrate's preparation 37 III.4.3. Preparation of Zn0.98-yCo0.02CuyO thin films 38 II.4.4. Preparation of Zn0.98-xCu0.02CoxO thin films 38 II.5. Characterization Methods of Thin Films 39 II.5.1. X-ray diffraction (XRD) 39 II.5.2. UV-Visible spectroscopy 41 II.5.2.1. Optical bad gap Eg 43 II.5.2.2. Urbach energy ( |
| Type de document : | Thése doctorat |
Disponibilité (1)
| Cote | Support | Localisation | Statut |
|---|---|---|---|
| TPHY/155 | Théses de doctorat | bibliothèque sciences exactes | Consultable |
