| Titre : | Influence of Mg doping on properties of Mg-Al co-doped ZnO thin films prepared by spray pyrolysis method |
| Auteurs : | Berramdane Feryal, Auteur ; Ouahiba Boudib, Directeur de thèse |
| Editeur : | Biskra [Algérie] : Faculté des Sciences Exactes et des Sciences de la Nature et de la Vie, Université Mohamed Khider, 2023 |
| Format : | 1 vol. (77 p.) / ill., couv. ill. en coul / 30cm |
| Langues: | Français |
| Langues originales: | Anglais |
| Mots-clés: | Mg–Al co-doping , pneumatic spray pyrolysis ,properties,Thin films |
| Résumé : |
The present work objective is the deposition and characterization of (Mg-Al) co-doped zinc oxide thin films (AMZO) were deposited by pneumatic spray pyrolysis technique at 400°C and discussing the various properties of four samples prepared by changing the concentrationofMgfrom(0% ,1%,2% and 3%)with the doping concentration of aluminum was considered constant at 1%. In order to analyze and study our produced films, we used various techniques namely X-ray diffraction to determine the structure of the thin films, scanning electron microscopy to observe the morphology of the surfaces, UV-visible spectroscopy to evaluate the optical properties and four-point measurement to calculate the electrical resistivity of various AMZO thin films.The best properties were obtained for the thin films of AM1ZO. We found that this sample has the best crystallization, and a uniform surface, and high transparency in the visible range (85%), with a band gap 3.32 eV, in addition to a good figure of merit (2.25 .10-10Ω -1 ). |
| Sommaire : |
ACKNOWLEDGEMENT
DEDICATION CONTENTS List of Figures List of Tables General Introduction ....... 1 CHAPTER I: BIBLIOGRAPHIC RESEARCH I.1. Transparent conductive oxide (TCO) .................................................................... 4 I.1.1. Definition of TCO .................................... 5 I.1.2 Properties of TCO ............................... 5 I.1.2.1 Electrical Properties ................................... 5 I.1.2.2 Optical Properties of TCOs: ................... 6 I.1.3.Criteria for Choosing TCO ............. 7 I .2. Zinc Oxide (ZnO) ............................. 8 1.2.1. The Choice of ZnO ............................ 8 I.2.2. Definition of Zinc Oxide ................. 9 I.2.3. Zinc Oxide Properties ...................... 9 I.2.3.1 Structural properties ............. 9 I.2.3.2 Electrical Properties ........................ 11 I.2.3.3 Optical Properties ..................... I .2.4 Doping of ZnO ................................... 13 I.2.5 Co-doped ZnO .................................... 13 I.2.5.1 Scope of co-doped ZnO ...................... 13 I.2.5.2 Mg, Al Co-doped ZnO: AMZO ................................................................... 14 I.2.6 Review of doped and co-doped zinc oxide thin films ........................................ 15 I.2.7 Major applications of zinc oxide ......................... 17 References……………………………………………………20 CHAPTER II: THIN FILMS DEPOSITION TECHNIQUES AND CHARACTERIZATION METHODS II.1.Deposition methods: ........................ 25 II.2. Criteria for selection of a deposition technique .................................................. 26 II.3 Choosing the ZnO Deposition Process ..................... 27 II.3.1. Spray pyrolysis ............................ 27 II.3.1.1 Introduction .................................... 27 II.3.1.2 Definition of spray pyrolysis ................. 27 II.3.1.3 Principle ........ 28 II.3.1.4 Model for film deposition by spray pyrolysis ............................................. 28 II.4.Characterization Methods : ................................................................................. 31 II.4.1 Thickness Measurements .................... 31 II.4.2.Structural Characterization:.............. 32 II.4.2.1. X-Ray Diffraction : .................. 32 II.4.2.2.Mesh Parameters Determination.................... 33 II.4.2.3 .Crystallite size determination .................................................................... 34 II.4.2.4.Strain determination ......................... 34 II.4.3. Optical Characterization .............. 35 II.4.3.1UV-visible spectroscopy ........................... 35 II.4.3.2 Transmittance Spectra .......................... 36 II.4.3.3 Optical Band Gap................ 37 II .4.3.4 Urbach Energy ................................... 38 II.4.4. Electrical Characterization .......................... 39 II.4.4.1 Four-Points Probes Method ................ 39 II.4.4.2 Electrical Resistivity Measurement ............................................................ 40 II.4.5. Morphological Characterization of Thin Films ................................................ 41 II.4.5.1 Scanning Electron Microscope (SEM) ............... 41 II.4.5.2Energy dispersive X-ray spectroscopy (EDS or EDX) ...... 42 II.4.6 Fourier Transform Infrared Spectroscopy (FTIR) ........... 43 References ………………….….…..45 CHAPTER III: EXPERIMENTAL PART AND DISCUSSION III.1 Experimental method ........................ 48 III.1.1 Pneumatic spray pyrolysis technique ............................................................... 48 III.1.2 Preparation of substrates and spray solutions ................................................... 49 III.1.2.1 Preparation of substrates ..................... 49 III.1.2.2 Preparation of solutions .................................. 50 III.1.2.3 Deposition of thin films ................................. 51 III.2 Results and discussions ..................... 54 III.2.1 Growth rate of the films ...................... 54 III.2.2 Structural study ..... 55 III.2.2.1 X-ray Diffraction Spectrum (XRD) ........................................................... 55 III.2.2.2 Crystallite size and dislocation density .......................................... 58 III.2.3. Optical properties ..................... 60 III.2.3.1. Transmittance spectra ............... III.2.3.2 Band gap energy .................................. 62 III.3.3.3 Urbach energy .............................. 64 III.2.4 Electrical properties .......................... 64 III.2.5 FTIR Analysis .... 66 III.2.6 Surface morphology and composition analysis .............. 67 Refereces ……………..69 General Conclusion ....... |
| Type de document : | Mémoire master |
Disponibilité (1)
| Cote | Support | Localisation | Statut |
|---|---|---|---|
| MPHY/622 | Mémoire master | bibliothèque sciences exactes | Consultable |
