Electrical Properties of ZnO Thin Film Transistors | Book Publisher International

As a pivotal component in modern electronics devices, TFTs play a crucial role as a switching element in display and flexible electronics. This comprehensive work meticulously explores the electrical properties of ZnO TFTs, with different gate dielectrics offering a detailed investigation of the underlying materials, diverse fabrication techniques, and strategies for optimizing performance.

The first section of the book provides a general introduction of the TFT, its applications and physical processes involved in TFT. A brief review of the works on TFTs is also introduced in this section. In the next section an insightful overview of the materials used and methodology adopted in fabrication of ZnO TFTs is presented.

The core of the book focuses elaborately on the investigation of the electrical properties of ZnO TFTs with different gate dielectric materials such as Nd2O3, La2O3 and Al2O3 using different fabrication techniques viz. thermal evaporation, chemical bath deposition and sol-gel technique. Key aspects such as field effect mobility, threshold voltage, sub-threshold swing, gain bandwidth product etc. are explored in depth. Furthermore the effect of annealing temperature in ambient and oxygen atmosphere on the TFT characteristics are also investigated and presented.

Author(s) Details:

Paragjyoti Gogoi,
Department of Physics, Sibsagar College, Joysagar (Autonomous), Sivasagar, Assam, India.

Please see the link here: https://stm.bookpi.org/EPZTFT/article/view/13456

Comprehensive Characterization of Nitrogen-Doped Zinc Oxide Thin Films Produced by Metalorganic Chemical Vapour Deposition (MOCVD) | Book Publisher International

 This study proposed to produce nitrogen doped metallic mineral oxide thin films from a low and easily reproducible forerunner. This was with a view to specify an effective link for the result of nitrogen doped metallic mineral oxide thin films that will be suitable for miscellaneous technological requests.The raw materials for the forerunner were zinc acetate and ammonium acetate. The forerunner was created from the two compounds in magnitudes (ammonium acetate to zinc acetate) of 1:9 (10%), 2:8 (20%), 3:7 (30%) and 4:6 (40%), and named as Samples B1, B2, B3 and B4 respectively. The formulations were treated powder-dry and each sample was cracked in MOCVD dethroning chamber to deposit ZnO thin films on jug substrates successfully at 420°C. The active pressure was atmospheric while compacted air was used as the one who carries or transmits something gas accompanying a flow rate of 2.5 dm3/min. The ZnO thin films located were characterized to catch their optical, fundamental, compositional and electrical possessions and surface morphology.The ocular characterization demonstrated that all the deposited thin films were over 80% see-through to the visible spectrum. Sample B1 had peak travel of 95.0% at 785nm wavelength, B2 had 96.7% peak at 970nm, B3 had 99.0% peak at 1040nm, and B4 had 93% peak at 1090nm. The ocular measurements again gave the strength bandgap of 3.27eV for Samples B2 and B3, and 3.31eV for Samples B1 and B4. The x-ray dissemination studies showed that the located thin films were amorphous, and present poorly defined peaks at 2θ=32.9° for Samples B1, B2 and B4 and at 2θ=30.6° for Sample B3. RBS calculations gave a somewhat constant (average) percentage for the three identified pieces in the thin films (zinc : oxygen : nitrogen) as 4.4 : 3.7 : 1. Thicknesses acquired through the RBS were 14.43μm for B1, 58.72μm for B2, 52.28μm for B3, and 36.09μm for B4. The sheet resistivity act the high side, but reduced a bit piercingly from B1 to B2, gradually from B2 to B3, and much more piercingly from B3 to B4. The values were 1.53 x 109 Ω/sq. for B1, 1.10 x 109 Ω/sq. for B2, 1.00 x 109 Ω/sq. for B3, and 8.00 x 107 Ω/sq. for B4. The micrographs presented extensively joined clusters of grains with few (nitrogen) gas bubbles on few of the surfaces.This study concluded that the forerunner produced maybe used to deposit doped metallic mineral oxide thin films that could again be useful in dependable state scheme fabrication, smoke sensors and anti-reflectors.

Author(s) Details:

Uchenna Sydney Mbamara,
Department of Physics, Federal University of Technology, Owerri, Imo State, Nigeria.

Please see the link here: https://stm.bookpi.org/CCNDZOTFPMCVD/article/view/8655

Study on Preparation and Characterization of Subsurface Silver Particulate Films on Polymer Blends of Polystyrene/Poly (2-Vinyl pyridine) /Poly (Vinylpyrollidone)/Poly (4-Vinyl pyridine) | Chapter 10 | Recent Trends in Chemical and Material Sciences Vol. 4

 In the last few decades, polymer nanocomposites have been an enormously growing topic of research for producing materials. When a little amount of nanosized particles is added to a polymer matrix, the polymer nanocomposite improves dramatically. Inorganic solid nanoparticles (usually in the shape of fibres, flakes, spheres, or tiny particles) improve the physical, structural, and mechanical properties of polymer matrix. Since polymer–nano composites have become a mainstay of the modern polymer industry, their durability in a variety of environments, as well as their degradability after their service life, are important research areas. The precise preparation processes, followed by testing and characterization, are essential for the successful application of nano particles. Surface modification can help to improve the inherent properties of nanoparticles and prepare nano composites that aren't found in nature. As a result, some tools may be utilised to optimise the preparation of polymer nano composites based on their various properties such as electrical, optical, and morphological. This leads to a focus on polymer nanocomposite preparation and characterization. This chapter will provide an overview of silver particulate thin films deposited at a rate of 0.4 nm/s on softened polymer blends of Polystyrene (PS)/ Poly (2-vinyl pyridine) (P2VP), PS/ Poly (4-vinylpyridine) (P4VP), and Poly (vinylpyrollidone) (PVP)/P4VP at a temperature of 457 K in a vacuum of 810-6 Torr Electrical behaviour, optical characteristics, and scanning electron microscopy were used to investigate these particle thin films (SEM). Due to the creation of a highly agglomerated structure, silver films formed on softened PS and PVP have a very high room temperature resistance that approaches that of the substrate. Silver films on softened P2VP and P4VP, on the other hand, have a room temperature resistance in the tens to hundreds of M/, which is desirable for device applications. At room temperature, silver films on PS/P2VP, PS/P4VP, and PVP/P4VP composites show resistance. The optical and plasmonic response of Ag nanoparticles encapsulated in thin layers of blends demonstrates nanoparticle encapsulation. The creation of substantially smaller, narrower dispersion and wide size distribution is indicated by the electrical characteristics and SEM of silver nanoparticles on thin layers of polymer blends.

Author(S) Details

Pratima Parashar Pandey
Department of Materials Science, Mangalore University, Mangalagangotri -574 199, India. and IILM College of Engineering & Technology, Greater Noida-201310, India.

View Book:- https://stm.bookpi.org/RTCAMS-V4/article/view/4802

Investigating the Effect of Temperature and Phase on Properties of Metal Pseudobrookite | Chapter 7 | Challenges and Advances in Chemical Science Vol. 3

 Spin glass behaviour, thermal microcracking, magnetic roughness, and high resistivity are all characteristics of iron titanate, a metal pseudobrookite. Pseudobrookite is a polycrystalline pseudobrookite that has a wide range of uses. The electrical resistivity and dielectric properties of pure iron titanates prepared with the rutile form of titanium oxide and sintered at two temperatures, 1000oC and 1250oC, as well as pure iron titanates prepared with the anatase form of titanium oxide and sintered at 1250oC, are compared in this paper as a function of temperature and relaxation spectra. The iron titanates are manufactured with A.R. grade oxides and a traditional ceramic process. The formation of a single phase is confirmed by XRD and FTIR studies. All of the samples are pseudobrookites with orthorhombic unit cells in terms of structure. For the pseudobrookite made from rutile TiO2, study of the relaxation spectra reveals the existence of space-charge, which increases with sintering temperature. According to the research, pseudobrookite produced from anatase TiO2 has worse dielectric and electric properties at lower frequencies (1 kHz) and exhibits substantial hysteresis, indicating delayed microcrack healing. The impact of structural alterations on resistivity, dielectric constant, and dielectric loss are examined.

Author (S) Details

S. S. Gurav
Department of Physics, K. E. S. Anandibai Pradhan Science College, Nagothane – 402106 (M.S.), India.

S. V. Salvi
Department of Physics, K. E. S. Anandibai Pradhan Science College, Nagothane – 402106 (M.S.), India.

View Book :- https://stm.bookpi.org/CACS-V3/article/view/2953