| Titre : | Biodetector (sensors) for health applications |
| Auteurs : | Louedane Issam Slimane, Auteur ; Nora Amele Abdeslam, Directeur de thèse |
| Type de document : | Mémoire magistere |
| Année de publication : | 2025 |
| Format : | 1 vol. (72 p.) |
| Langues: | Français |
| Mots-clés: | n-type OTFT, gate-oxide, Fullerene, Silvaco, simulation, BGTC, TGTC |
| Résumé : |
The study examines Fullerene (C60) semiconductor-based OTFTs as n type OTFTs.Two main OTFT topologies are examined: TGTC OTFT and BGTC OTFT. First, the TGTC OTFT was investigated where the decreased oxide thicknesses di to 0.2 μm enhances the output responses from the point of view less drain voltages needed to achieve the saturation region. Increased oxide relative permittivity improves transistor performance,where Ga2O3 is selected for balance intensity and early saturation. Additionally, the I-V characteristics are enhanced by shortening gate electrode length (5 μm) and while selecting gate material, Polysilicon with less work function (4.17 eV) shows better control while copper gives a slight superior maximum transconductance (gm, max). Secondly, The BGTC OTFT has shown negligible impact regarding the use of substrate, evenly when the source and drain contacts are embedded. Fortunately, enlarging these electrodes (drain and source) significantly enhance the intensity of the drain current versus Vd/Vg, the operational voltage (faster responses and less Vth), and brings the saturation earlier. |
| Sommaire : |
Table Of Contents Abstract I ملخص I Table Of Contents II List Of Figure IV List Of Table VII General Introduction 1 Chapter I Materials for thin Film Transistor (TFT) 4 I.1 INTRODUCTION ...................... 4 I.2 THE DIFFERENCES IN MATERIALS.................. 4 I.3 INSULATING MATERIALS ......................... 5 I.3.1 INORGANIC INSULATOR ........................ 5 I.3.2 ORGANIC INSULATING MATERIALS ............... 7 I.4 SEMICONDUCTOR MATERIALS ...................... 8 I.4.1 INORGANIC SEMICONDUCTORS: .................. 8 I.4.1.1 Inorganic semiconductors (n-type) ........ 8 I.4.1.2 Inorganic semiconductors (p-type) ........ 10 I.4.2. ORGANIC SEMICONDUCTORS (OSCS) ............. 11 I.4.2.1 Organic semiconductors (n-type) .......... 13 I.4.2.2 Organic semiconductors (p-type) .......... 14 I.5 THE POLARON .................................. 16 I.6 CHARGE TRANSPORT IN ORGANIC SEMICONDUCTORS ... 17 I.6.1 HOPPING BETWEEN LOCALIZED STATES ........... 17 I.6.2 MULTIPLE TRAPPING AND RELEASE MODEL (MTR) ..... 19 I.6.3 THE POLARON MODEL ............................. 20 Chapter II Organic thin film transistor principle and applications 24 III II.1 Introduction 24 II.2 TRANSISTOR MOSFET ........... 24 II.2.1 WORKING PRINCIPLE OF MOSFET TRANSISTOR ................... 25 II.2.2 MOSFET CHARACTERISTICS ................................... 26 II.2.2.1 The Id-Vg transfer characteristic ................................................................. 26 II.2.2.2 The Id-Vd characteristic ............................... 27 II.3 ORGANIC THIN-FILM TRANSISTORS (OTFT) ................................................................. 28 II.3.1. PRINCIPE AND OPERATION .................................. 29 II.3.2 CHARACTERISTIC PARAMETERS OF OTF TRANSISTOR .............. 30 II.3.2.1 Field Effect Mobility ................................ 30 II.3.2.2 Threshold voltage (Vth) .............................. 31 II.3.2.3 The Current On/Off Ratio ............................. 32 II.3.2.4 The sub-threshold slope (SS) ......................... 32 II.3.3 STRUCTURAL DESIGNS ..................................... 33 II.3.3.1 Single-gate device .............................. 33 II.3.3.2 Double-gate structures .......................... 34 II.4 PHYSICAL EQUATIONS OF THE DEVICE (OTFT) ............. 35 II.4.1 CARRIER TRANSPORT ................................. 35 II.5 APPLICATION OF OTFT ................................. 39 II.5.1 ELECTROCHEMICAL DETECTION WITH TRANSISTORS ........ 40 II.5.1.1 Biosensor: Structure and Principle .............. 40 II.5.1.2 OTFT for Bio detection .......................... 46 Chapter III Modelling under Silvaco software, Results, and discussion 50 III. I INTRODUCTION ....................................... 50 III.2 PLATFORM SILVACO FOR TRANSISTORS ............ 51 III.3 OTFT SIMULATION MODELS ...................... 52 III.4 OTFT SIMULATION AND INTERPRETATION .......... 54 III.4.1 TGTC STRUCTURE (GATE (COPPER)/DIELECTRIC/C60 OSC/SUBSTRATE (SIO2)) ......... 55 III.4.1.1 The gate-oxide effect ............... 56 III.4.1.1.1 Material type effect............... 56 III.4.1.1.2 Gate-Oxide thickness effect ....... 57 III.4.1.2 THE GATE EFFECT...................... 62 IV III. 4.1.2.1 GATE LENGTH IMPACT ON TGTC OTFT ............ 62 III.4.2.2 GATE MATERIAL EFFECT ........................ 63 III.4.2 BGTC STRUCTURE (GATE/DIELECTRIC/OSC) ........... 66 III.4.2.1 BGTC structure with and without substrate ........ 66 III.4.2.2 BGTC structure with embedded electrodes (source and drain) ......... 67 III.4.2.3 BGTC structure with embedded and extended electrodes (source and drain) ......................... 69 III. 5 SUMMARY ......... 70 General Conclusion 70 Bibliography 72 |
Disponibilité (1)
| Cote | Support | Localisation | Statut |
|---|---|---|---|
| MPHY/674 | Mémoire master | bibliothèque sciences exactes | Consultable |
