| Titre : | Enhancement of the Electrical and optical properties of NiO this films by Al and Na codoping |
| Auteurs : | Fatiha Chebira, Auteur ; Said Benramache, Directeur de thèse |
| Type de document : | Monographie imprimée |
| Editeur : | Biskra [Algérie] : Faculté des Sciences Exactes et des Sciences de la Nature et de la Vie, Université Mohamed Khider, 2018 |
| Format : | 1 vol. (44 p.) / 30cm |
| Langues: | Anglais |
| Mots-clés: | NiO,pneumatic spray method,thin films,codoped (Na,Al). |
| Résumé : |
n the present work, we have studied the effect of Na and Al co-doping on optical, structural and electrical properties Na and Al co-doping NiO thin films by using spray pneumatic method. The influence of Na and Al co-doping in the range 0 to 4 wt.% was investigated to obtain the Na and Al codoped NiO thin films, it is deposited at a substrate temperature of 420°C with NiO solution 0.1M. As found that a only (111) peak was observed for Na and Al codoped NiO thin film indicating that the Na and Al codoped NiO thin films a polycrystalline in nature with cubic structure. The optical transmissions spectra showed all NiO thin films become transparency in visible region. The band gap energy increased and decreases to reaching a minimum to be3.63 eV at 4wt.%. The minimum value of Urbach energy was 0.31eV, it is obtained at 3wt.%. The minimum electrical resistivity of the NiO films was located at 1wt.%. The best estimated structure, optical and electrical characterizations are achieved in sprayed NiO thin films at 1wt.%.
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| Sommaire : |
Table of contents Acknowledgements
Table of contents General introduction Chapter I: NiO thin films and applications I.1. Introduction…………………………………………………………………… 5 I.2. NiO thin films…………………………………………………………………... 5 I.2.1. structural properties…………………………………………………………. 5 I.2.2. Electrical properties………………………………………………………..... 6 I.2.3. optical properties…………………………………………………………...... 8 I.3. different phases of NiO………………………………………………………… 8 I.3.1. Nickel and nickel compounds………………………………………………. 8 I.3.2. Nickel (II) oxide NiO……………………………………………………….. 9 I.3.3. Nickel hydroxide, Ni(OH)2 …………………………………………………………………………... 9 I.3.4. Nickel oxyhydroxide, NiOOH……………………………………………... 10 I.3.5. Redox mechanism and electrochromic properties of nickel oxide-based thin films…………………………………………………… 11 I.4.Formation of NiO thin films………………………………………………….. 12 I.4.1. NiO thin film deposition from Nickel chloride solutions………………….. 12 I.4.2. NiO thin film deposition from Nickel Nitrate solutions…………………… 13 I.4.3. NiO thin film deposition from Nickel Acetate Solutions………………….. 13 I.5.diffrent methods of preparation of NiO thin films………………………….. 14 I.6.The variations of NiO Application……………………………………………. 15 I.7 the rool of codoped NiO thin films…………………………………………… . 16 I.8. Conclusion……………………………………………………………………… 17 Chapter II: Elaboration and characterizations II.1.Introduction………………………………………………………………….. 22 II.2.Spray pneumatic meth(spm)………………………………………………… 22 II.3.preparation of the solution………………………………………………….. 22 II.4. preparation of Glass substrate…………………………………………….. 24 II.5.Preparation of NiO thin films………………………………………………. 25 II.5.1. Preparation of undoped NiO thin films…………………………… 25 II.5.2. Preparation of Al and Na codoped……………………………………. 26 II.6. characterization technique………………………………………………….. 26 II.6.1. X-Ray Diffraction measurement…………………………………… 26 II.6.2. Electrical characterization…………………………………………. 28 II.6.3. Optical characterization…………………………………………… 29 II.7. Conclusion……………………………………………………………………. 30 |
| Type de document : | Mémoire master |
Disponibilité (1)
| Cote | Support | Localisation | Statut |
|---|---|---|---|
| MPHY/455 | Mémoire master | bibliothèque sciences exactes | Consultable |
