The paper “The Fabrication of the Pentacene Thin Film Transistor” looks at a fused-ring polycyclic aromatic hydrocarbon, presents relatively high carrier mobility when used for fabricating the organic thin-film transistors and this means that pentacene is widely used as the active material…
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Thin-film transistors, or TFTs, are widely used in the electronic flat panel industry and every flat panel display contains millions of such transistors (Kagan, 2003, Chapter 1). The world is now using more flat panel displays than ever before and less of the conventional cathode ray display technologies, with many giant factories around the world churning out millions of TFT displays annually. In addition to flat panel displays, TFTs find application in active matrix liquid crystal flat panel displays, active matrix all organic flat panel displays, active matrix images, large sensor arrays and smart tags for price and inventory applications (Klauk, 2000, Pp. 63 – 64). It has been more than six decades since the conceptualization of the TFT and over time new materials, structures, and fabrication techniques have emerged for these transistors. However, the monocrystalline materials, such as gallium arsenide (GaAs), that showed the greatest promise for fabrication of high-speed TFTs are expensive to source in the required purity and costly to process, rendering manufacturing of large-area devices manufactured using such materials prohibitively expensive (Kagan, 2003, Chapter 6). Thus, efforts persisted to try to use organic materials, such as polythiophene, oligothiophenes, pentacene and other small molecule organic materials, which were low cost, cheaper to process at room temperature and lightweight despite the fact that such materials could not offer fast switching and presented a large number of defects for a large area. Fortunately, the response time requirements for the human eye did not require the fastest switching times for TFTs for flat panel display applications.
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...? Evaporation Deposition of ThinFilms – An Analysis of Growth Characteristics of Aluminum and Copper Films [You can change the of [Enter Your Name] [Enter University Name] Abstract: A vacuum chamber was used to deposit aluminum and copper, which were evaporated through Joule heating, as thinfilms on glass sheets. The film growth was analyzed through resistance measurement for after every two seconds. Discussions on the results obtained for growth rate of films indicated by the resistance measurements was made in the light of Van der Pauw’s method for resistance measurement of thin...
...? Growth Analysis of ThinFilms of Aluminum and Copper Deposited through Evaporation [You can change the of [Enter [Enter University Name] Abstract: Copper and Aluminum thinfilms were deposited on glass substrates using evaporation technique. For growth characterization, resistance measurements were made across the film at regular intervals to obtain rate of change of resistance. These readings were analyzed to determine time taken for continuous film formation for both copper and aluminum and their growth rate was determined through empirical methods. Introduction: Evaporation is a physical vapor deposition process, which involves...
...?THIN CLIENT OPERATING SYSTEM SECURITY Thin client is a term which is used to refer to a network computer or PCs which are used by businesses whose design makes them to be managed centrally and their configuration makes them to lack CD/DVD players or expansion slots. Therefore these devices contain only equipment which is essential for the business functions which they serve. Moreover, thin client refers to a set of technologies which are designed to reduce the total cost ownership (TCO) for businesses. The reduction in TCO results from the fact that thin clients are characterized by low costs in hardware, maintenance, support and bandwidth. In addition,...
...) The figure above shows the effect in size of the substrate after deposition of thinfilm. This shows that after deposition of thinfilm the resistivity of the material increases, whereas, the temperature co-efficient of resistance decrease in metals. Thinfilm reduces the mobility as well as thermal conductivity in metals. However, it enhances the thermoelectric power in metals. (Wasa, Kitabatake & Adachi: 15-22) The figure above shows field and tunneling effects of thinfilms. The conductance of the semiconductor changes because of the electric field produced by the TFT (Thin...
...observed to appear -5V and +5V respectively for about a 2 second period of time. That was when different pulses of OTMFTs were applied to the gate electrodes. This was evident in non-volatile state attitude for the organic thinfilm memory transistor device. Graphene oxide and floating gate: Other authors, including Tae-Wook Kim, Yan Gao, Orb Action, Hin-Lap, Hong Ma and others, also reported about the electrical characteristics of organic non-volatile memory transistors (ONVMTs) using chemically synthesized grapheme oxide (GO) as a charge trapping layer based on pentacene/PMMA/Grapheme oxide nanosheets/SiO2.GO (Kim, et al., 2010). the nanosheets were...
...Client’s 16 November 2009 Fitness conscious people have taken levels of fitness to an unprecedented level, people have realized the need to be fit and they work towards getting a perfect body all the time. Dies consciousness has gone up amongst the masses and this has also brought about very positive results. This paper will throw light upon how thin is too thin? The paper will also present how fitness conscious people have become these days.
“THEY were alarmingly thin. Snejana Onopka, Natasha Poly and Hana Soukupova, models in demand among the fashion designers who showed their collections in New York last week, appeared so gaunt and thin that their knees and elbows were larger than their concave thighs and pipe cleaner arms... , and their...
...) to increase efficiency. Electropolymerisation may still be used in case of unavailability of suitable and commonly used organic semiconductors (Brazis, Gamota, Kalyanasundaram & Zhang, 2004, p9).
The Two Fabrication Structures
Optimization of structural design and devise interfaces led to several construction designs formulations but the most widely used are top and bottom contact Organic ThinFilmTransistors (OTFTs). The terms top and bottom refer to the position of the two electrodes in relation to the position of the semiconductor.
The Top Contact OTFTs
Top-contact OTFTs have their thin semiconductor film layer deposited first,...
...Organic ThinFilmTransistors (Literature Review) Yousaf January Table of Contents Abbreviations and Variables 2 Introduction 3 Development, advantages and uses 3
2. Materials 4
3. Characteristics 7
4. Conclusion 10
List of Figures
Figure 1: The basic structure of a p-type organic thinfilmtransistor (top/bottom contact) 3
Figure 2: Improvements in the hole mobility of OTFTs over the years 4
Figure 3: Structure of a PDBT-co-TT based OTFT 5
Figure 4: Chemical structure of pentacene 5
Figure 5: Thinfilmtransistor mobility for fabrication of C6FTTF and C12FTTF thinfilmtransistors 6
Figure 6: Typical output and transfer characteristics of a pentacene based OTFT 7
Figure 7: Plots of drain current (ID) against drain voltage (VD... ) for...
...to drug addiction. A person is sure that by means of starvation he/she will get rid of "surplus" of weight, and then will start living as before. But, unfortunately, it is not so. The fact is that the organism is gradually getting used to feeling of hunger and soon starts refusing food. Over time it brings complications. Failure of digestion process leads to reduction of delivery of the useful substances to an organism. The lack of calcium negatively influences the structure of bones. Hormonal failure leads to violation of activity of a thyroid gland, change of a menstrual cycle that can lead to infertility. Anorexia is accompanied by memory and attention impairment. From the movie we can learn that the treatment of such illness is a...
...transport, since an organic material is composed of weakly bonded molecules. Fig. 11 shows a three-dimensional structure of a thinfilmtransistor with the applied voltages.
Fig. 11. The 3D structure of a thinfilmtransistor (Zhu, 2003).
Fabrication and Characterization of PentaceneThinFilmTransistors
The use of organic thinfilms of small molecules, like pentacene (C22H14), has been widely researched. Besides, pentacene-based transistors can be easily interfaced...
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