Dissertations / Theses on the topic 'OTFS'
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Wagner, Michael. "Concepts for In-memory Event Tracing." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-172882.
Full textLuu, D. (Duc). "OTSS: Oulu traffic simulation system." Master's thesis, University of Oulu, 2017. http://jultika.oulu.fi/Record/nbnfioulu-201710112981.
Full textLang, Ursula Friederike. "Oktoberfest-Triage-Evaluationsstudie 1998 (OTES ’98)." Diss., lmu, 2001. http://nbn-resolving.de/urn:nbn:de:bvb:19-3638.
Full textKuai, Wenlin. "Faisabilité de transistors organiques à effet de champ fabriqués entièrement en solution." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S013/document.
Full textPresent work deals with the new trend to get highly flexible electronics by using fully Organic Thin-Film Transistor (OTFT) as the basic element of this electronics. Fully organic n-type as well as p-type OTFT processed by inkjet printing are studied. Printing parameters of each ink, jettability, wetting, printability, and patterns optimization, leading to the deposition of conductive contacts, gate insulator and semiconducting active layer are studied. Process of n-type OTFT based on C60 is shown as unreliable, mainly due to the poor solubility of C60 in organic solvent. In the contrary, p-type OTFTs based on Tips-pentacene are much more reliable. The work is a large overview of the issues and the difficulties that have been to jump and to solve in the way to fabricate fully printed organic transistors. Some solutions have been given and new ideas have been proposed
Burnside, John. "Reintroduction and conservation of the Great Bustard Otis tarda." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604569.
Full textLíčeník, Lukáš. "Motivace a stimulace zaměstnanců ve firmě OTIS a. s." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2012. http://www.nusl.cz/ntk/nusl-223466.
Full textBelgardt, Christian. "Herstellung mikrostrukturierter OTS-Monolagen auf Siliziumoxidoberflächen." Master's thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-86379.
Full textWith help of thin layers of alkoxysilane molecules formed by self-assembly, the surface properties of solids can be controlled. Microstructured self-assembled monolayers (SAMs) are interesting for applications in components based on organic semiconductors. Two established technologies for the structuring of molecular monolayers are microcontact printing and photolithography, for which templates and masks need to be structured. In this way, setting times and costs are high if variable patterns have to be structured. In this work, the fabrication of laterally structured monolayers from octadecyltrichlorosilane (OTS) is demonstrated for two examples of alternative, both template-free and maskless technologies: (i) inkjet as a purely additive method, and (ii) photothermal laser desorption as a subtractive structuring of an OTS-SAM. For the inkjet technology, a method for the observation and analysis of the evaporation of a droplet is implemented at a goniometer and a mathematical model for small inkjet droplets is extrapolated, For the subtractive laser structuring, the achievable patterning resolution is investigated as a function of laser intensity and scanning speed. The results of both technological approaches are compared
Schmidt, Rüdiger. "Perylene bisimide and acene derivatives as organic semiconductors in OTFTs." kostenfrei, 2008. http://nbn-resolving.de/urn/resolver.pl?urn=nbn:de:bvb:20-opus-29314.
Full textHizon, John Richard. "Reconfigurable CMOS OTAs for filters in a multi-standard receiver." Thesis, Imperial College London, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540631.
Full textZa'aba, Nor. "Electrical, environmental and optical stress effects on PS-DNTT OTFTs." Thesis, Bangor University, 2018. https://research.bangor.ac.uk/portal/en/theses/electrical-environmental-and-optical-stress-effects-on-psdntt-otfts(d44daf1d-ab86-4c14-92ae-c0f21ba8f0de).html.
Full textDíaz, José Antonio, and Virendra N. Mahajan. "Diffraction and geometrical optical transfer functions: calculation time comparison." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626488.
Full textMontško, Marián. "Návrh, implementace a správa firemních VoIP sítí." Master's thesis, Vysoká škola ekonomická v Praze, 2008. http://www.nusl.cz/ntk/nusl-3338.
Full textWilliams, Robert Stansell Roslin. "Ecology and population dynamics of the long-eared owl Asio otus." Thesis, University of East Anglia, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338230.
Full textAguiar, André Filipe Oliveira. "Populações de Strix aluco e Otus scops em áreas agro-florestais." Master's thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/892.
Full textO presente estudo tem como objectivo estudar as populações de Coruja-domato e de Mocho-d'orelhas em áreas agro-florestais, nomeadamente as suas distribuições, densidades e estimativas populacionais, influência de factores ambientais e temporais, comportamento a vocalizações da mesma e espécie e de outras e selecção de habitat. A nebulosidade afectou a detectabilidade da Coruja-do-mato e o vento a detectabilidade do Mocho-d'orelhas. A actividade vocal destas espécies decai ao longo da noite, sendo que normalmente estas espécies não se deslocam durante a emissão de vocalizações. As espécies encontram-se associadas a manchas florestais próximas de estradas não asfaltadas. A distribuição de Coruja-do-mato é influenciada pela presença de ruínas e edifícios abandonados. A distribuição de Mocho-d'orelhas é influenciada pela presença de vizinhos conspecíficos e de áreas de matos. Salienta-se a importância da realização de mais estudos do género, em particular para o Mocho-d'orelhas. ABSTRACT: This study aim to study the Tawny Owl and Scops Owl populations in farmland woodland areas, specially their distributions, population and densities estimations, temporal and environmental factors influence, behavior towards conspecific and other owl species vocalizations and habitat selection. The sky cover affects the Tawny Owl detectability and the wind the Scops Owl detectability. The vocal activity decay during the night, and these species do not move during the vocalizations playback. These species are associated with woodland areas near to non pavemented roads. Tawny owl distribution is influenced by the presence of ruins and abandoned buildings. Scops owl distribution is influenced by the presence of conspecífico neighbors and shrubland areas. The importance of more of this kind of studies, particularly with Scops Owl, is highlighted.
Cinnirella, Alessandro. "Nanoindentazione dello strato di pentacene in otft sottoposti a irraggiamento ionico." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5950/.
Full textHaddad, Clara. "Fabrication, caractérisation électrique et fiabilité des OTFTs imprimés sur substrat plastique." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT116/document.
Full textThis thesis project is about the study of stability and reliability of organic transistors printed at CEA-Liten. P-Type OTFTs were manufactured on plastic substrate, with a p-type polymer semiconductor (SP400 from Merck) and a fluoropolymer as dielectric. First, an experimental protocol for electrical characterization was determined in order to overcome potential effects due to environment, measurements or aging of OTFTs. Then a model based on the expression of the accumulation charge in the transistor was developed. This model allowed the OTFT parameters’ extraction during low temperature measurements, which showed a temperature-activated charges transport in the OSC. Finally, the impact of negative gate bias stress on OTFTs’ characteristics was studied. The electrical stability of the P-OTFTs was measured on several stacks to study the influence of the dielectric material or its deposition method and the influence of the gate (printed silver ink or sputtered gold electrode)
Bernát, Michal. "Zavádění systému řízení kvality pro projekt Metro Londýn v OTIS a.s." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2014. http://www.nusl.cz/ntk/nusl-224703.
Full textIllinger, Mario. "Bibliotheksbenutzer als personalisierte OTRS-Kunden - Verwendung vorhandener Authentifizierungs- und Stammdaten für die automatisierte Personalisierung von eingehenden Benutzertickets im OTRS zur Verbesserung des Kundenservices und Vereinfachung des Supportaufwands." Master's thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-99336.
Full textPhelan, Richard B. "OTF DGPS for estuarine dredging and sounding surveys." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ30017.pdf.
Full textWebb, Timothy Dayton. "The Booking Window Evolution and its Impact on Hotel Revenue Management Forecasting." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/90789.
Full textPHD
Niebling, Frank. "Entwurf und Realisierung einer Configuration Management Database nach ITIL für den Service Desk der SLUB Dresden." Master's thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-62906.
Full textTravaglini, Lorenzo. "In-situ detection of defect formation in organic flexible electronics by Kelvin Probe Force Microscopy." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10380/.
Full textJensen, Courtney LeAnn. "AGE, ATTENTION, AND OTS IN A CONSTRAINED VS UNCONSTRAINED TASK." UKnowledge, 2012. http://uknowledge.uky.edu/rehabsci_etds/4.
Full textMachač, Stanislav. "Inovace výroby soudečků valivých ložisek objemovým tvářením za studena (OTS)." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228248.
Full textPerlman, Yoav. "Responses of Great Bustard (Otis tarda) subpopulations to land-use changes in southwestern Iberia." Thesis, University of East Anglia, 2018. https://ueaeprints.uea.ac.uk/70109/.
Full textBebiche, Sarah. "OTFTs de type N à base de semiconducteurs π-conjugués : fabrication, performance et stabilité." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S105/document.
Full textThe main goal of this present work consists in the fabrication and optimization of N type organic field effect transistors. Bottom Gate Bottom Contact transistors are performed at low temperature T<120°C. Three different electro-deficient organic molecules are thermally evaporated and used as active layer. OTFTs based on LPP core molecule present low field effect mobility around 10-5cm2/V.s. The optimization study investigated on deposition parameters of this molecule on OTFTs performances does not allow improving this mobility. Moreover gate bias stress measurements reveal important instabilities related to this molecule. Indenfluorene derivatives core (IF) based OTFTs show better performances. Field effect mobility µFE=2.1x10-4 cm2/V is reached using IF(CN2)2 meta in optimized deposition conditions and µFE=1x10-2 cm2/V.s is obtained using IF(CN2)2 para after annealing treatment. The investigated gate bias stress study highlights the good electrical stability of IF(CN2)2 para based OTFTs. Temperature measurements allow us studying the charge transport phenomenon in these indenofluorene derivatives. Fabricated N-type OTFTs are used to perform a first electronic circuit that consists in a logic gate (invertor).Finally this low temperature process led us to achieve OTFTs devices on flexible substrates (PEN)
Naikoti, Ashwitha. "OTFS Transceivers Design using Deep Neural Networks." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5640.
Full textSinha, Sujata. "OTFS Modulation in MIMO Visible Light Communication Systems." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5739.
Full textSurabhi, G. D. "On Orthogonal Time Frequency Space Modulation for Wireless Communications." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4461.
Full textNi, Jen-Shyang, and 倪偵翔. "Development of soluble OTFT materials." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/26092851999167812401.
Full text國立中央大學
化學研究所
94
Via the Diels-Alder reaction to overcome the low pentacene solubility problem in the organic thin film field-effect transistors (OTFTs) is our goal. Pentacene precursor B (11) had been successfully synthesized from the reaction of N-sulfinyl-methanesulfonamide (10) and pentacene (1) catalyzed by [Pd(dppp)(PhCN)2](BF4)2 (9), which has been charactered spectroscopically by DSC, IR, MS, NMR, TGA, and UV. The kinetic study of pentacene precursor B (11) has been investigated (activation energy, Ea = 108.44 kJ/mol). In solid state, lower conversion temperature (166 ℃, no acid catalyst) of pentacene precursor B (11) was found. In the solution state (CDCl3 or acetone-d6), the lowest conversion temperature (room temperature) of pentacene precursor B (11) was obtained (lifetime is 14 minute in CDCl3). The performance of pentacene precursor B (11) in the OTFT by the solution process will be examined later.
Fang, Chun Chieh, and 方俊傑. "Ultraviolet Light Protective Layer for OTFTs Encapsulation." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/28361866999927670765.
Full text國立交通大學
顯示科技研究所
97
In this thesis, we fabricated N,N′-bis(naphthalen-1-y)-N,N′-bis(phenyl) benzidine (NPB) passivation to protect the organic thin-film transistors (OTFTs) from degradation under UV-light illumination. With a thermally-deposited NPB film on the OTFTs, it was found that UV-light induced degradation could be significantly reduced. For example, after about 120 minutes UV-light the change of field effect mobility was only 37 % and the change of threshold voltage was within 10%. On the contrary, the OTFTs without NPB film suffered serious degradation. The field-effect mobility was reduced by about 90%, and the threshold voltage was increased by more than 40%. UV-light induced degradation on OTFTs was also discussed; Through surface morphology analysis by atomic force microscopy ( AFM ) and electron Spectroscopy for Chemical Analysis ( ESCA ) , the surface oxidation and destroyed pentacene grains pentacene film was the dominative factor that influenced OTFT’s properties. We conclude that our NPB passivation is a promising way to protect pentacene TFTs. Finally, I would like to address that the work is conducted under the leading of my supervisor and also Mr. Kuo-His Yen, Ph. D student in our lab. The result is shared with all the co-workers in this research.
Yeh, Je-Yuan, and 葉哲源. "Novel Methods of Performance Enhancement for OTFT." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/9r6an9.
Full text國立中正大學
化學工程研究所
102
Field effect transistors (FETs) were first proposed by Lilienfeld in 1930, and then the first inorganic metal-oxide-semiconductor FET (MOSFET) was fabricated by Kahng and Atalla in 1960. In 1983, F.Ebisawa et al. used polyacetylene as a novel organic active layer material to produce the first organic field-effect transistor (or organic thin film transistor; OTFT). After that time, OTFT have been widely studied. Nonetheless, OTFT are not suitable for applications requiring high switching speed due to their lower mobility and lower On/Off ratio than inorganic thin film transistors (e.g. single-crystal inorganic thin film transistors). However, advantages of OTFT are many, such as a low- temperature production(~ 180 ℃), lightweight, low cost, solution processability, simple packaging, compatibility with flexible plastic substrates and potential applicability to flexible device display…etc. Therefore, OTFT can be widely used to make e-books, e-paper, electronic identification cards for active matrix driving, sensors, flexible circuits, radio-frequency identification (RFID) devices and display operation…etc. In the future, OTFT will have even greater applications in academic and industry. My dissertation is divided into five chapters. In chapter one, the introduction of conjugated polymer and OTFT is provided. In chapter two, the synthesized hydroxyethyl-terminated poly (3-hexylthiophene) (P3HT-OH) is used as a novel active layer material for fabrication OTFT. The hydroxyl group creates the hydrogen bounding between the hydrophobic P3HT polymer chain and the hydrophilic surface of SiO2 wafer, and this leads to regulated polymer chains on the surface of SiO2 wafer and enhances OTFT properties. Compared against the hydrophobic P3HT without hydroxyl group, hydroxyl groups at a 7.5% weight content lead to more chain regularity when polymer is bonded to SiO2 wafer surface and thus enhance the performance of OTFT device, such as an 114.2% increase in On/Off ratio, an 12.4% increase in mobility, a 23.3% decrease in threshold voltage and a 30.1% decrease in surface roughness. However, in a architecture (Si/SiO2/P3HT-OH) without any extra dielectric layer between P3HT and SiO2, many disadvantages appear, such as large leakage current and threshold voltage. To eliminate those disadvantages, in chapter three, we used a self-assembled monolayer, 3-azidopropyltriethoxysilane as a novel dielectric layer to modify the interface between the SiO2 and active layer, and replace simultaneously P3HT-OH with pentacene. Compared to the commonly used alkyl siliane C18 dielectric, 3-azidopropyltriethoxysilane which possesses stable formal charges is far more effective in increasing the On/Off ratio of OTFT device with an improvement of nearly three orders of magnitude. However, this novel SAM does not significantly enhance the other electrical properties except the On/Off ratio duo to the lower dielectric constant of 3-azidopropyltriethoxysilane than alkyl silane C18. Moreover, literatures show the use of silane as a modifying dielectric material is limited to SiO2 surface because the SiO2 surface has reactive hydroxyl groups. In other words, silane types of SAM can not be used in ITO or flexible substrates. In order to fix such problems, we will develop a new dielectric material with a high dielectric constant for all substrates in next chapter. Literatures show that polymeric dielectric layer materials (such as polyethylene phenol Poly (Vinyl Phenol); PVP) was used in ITO substrate because the polymer can be fabricated via spin-coating method on ITO glass. Although PVP is a commonly used polymeric dielectric material, its dielectric constant of PVP is not high (K <4), and literatures show that minimum thickness of polymeric dielectric layer is usually higher than 300nm and a higher operating voltage, 60V are needed for lowering the Pin-Holes effect. In order for OTFT devices to have a dielectric layer with high K (K>4.0)、small minimum thickness (< 300nm) and an ultra-low operating voltage ( < 1V), herein, in chapter four, we aim to design and synthesize an acrylic-based and multiply-polarized dielectric polymer material (because acrylics has the highest dielectric constant than all other polymers). In chapter four, we report a novel crosslinked polyacrylic dielectric material, poly(MMA-co-HEMA-g-AA), which is made via a crosslinking esterification between a specifically synthesized poly(MMA-co-HEMA) and poly(acrylic acid). When used in an ultra-low voltage (operating voltage Vt <1V) pentacene-based organic thin-film transistor (OTFT) as a Gate dielectric, poly(MMA-co-HEMA-g-AA) results in remarkable device performance and exhibits a higher dielectric constant (K=4.2) than those traditionally used crosslinked PMMA (K<3.9; Vt >1V) because of its multiple polarization structures, such as the dipole polarization from ester group of MMA and HEMA, and the ionic polarization from carboxylic acid group of AA. Moreover, the crosslinking esterification temperature for forming poly(MMA-co- HEMA-g-AA) (140℃) is lower than the glass transition temperature (Tg = 185℃) of most widely used plastic substrates, including poly(ether sulfones), and this is very advantageous for being a Gate dielectric. Furthermore, poly(MMA-co-HEMA-g- AA), being an acrylic (refractive index 1.4914 at 587.6 nm), transmits up to 92% of visible light (at 3 mm thickness) and reflects about 4% from its surface, and thus are more suitable than other polymers for fabrication of highly transparent OTFT devices, e.g. electronic papers. Overall, the experimental procedures from the chapter two to chapter four show that the dielectric constant and regulated active layer play very important roles in improving the performance of organic thin film transistors.
Yan, Ruei-Chih, and 顏睿志. "UV-enhanced Photo responsivity on PMMA-OTFTs." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/64100638432926075374.
Full text國立交通大學
顯示科技研究所
95
In this study, with the thermal solidification method, the soluble Polymethylmethacrylate (PMMA) was used as the gat-dielectric of organic thin film transistors (OTFTs). Furthermore, we treated the PMMA gate-dielectric with the UV-light treatment. According to our observation, the OTFTs with UV-light treatment on gate-dielectric, the threshold voltage will be reduced, the subthreshold swing will be increased, however, no significant change in field-effect mobility was observed. In the OTFT experiments under light-irradiation, the devices was irradiated with a ray at a wavelength about 460nm. Among the OTFTs with UV-light treatment on gate-dielectric, when the light-irradiation was turn on, a larger threshold voltage shift and phonic responsivity will be found. If we further analyzed the time-dependent OTFT characteristics after the light-irradiation, the OTFTs with UV-light treatment will show a shorter saturation time and a longer recovering time. In order to find out the origin of UV-light treatment on OTFT property variation, we tried to introduce the material analysis and dielectric-leakage analysis to rule out the effects of UV-light treatment on organic semiconductor inertial structure and the traps inside the dielectric film, respectively. Finally, we presumed the OTFT property variation should be dominated by the interface traps between the organic semiconductor film and the dielectric film, which may be created by the UV-light treatment. The proposed assumption is also verified by a serious time-constant analysis.
Darwis, Darmawati. "Fabricating nanoparticulate organic thin film transistor (OTFT) and organic photovoltaic (OPV) devices using inkjet printing." Thesis, 2013. http://hdl.handle.net/1959.13/1038771.
Full textThis thesis presents a systematic study on two types of semiconducting polymer nanoparticulate suspensions prepared using: (1) a surfactant-containing mini-emulsion method, and (2) a surfactant-free precipitation method. Both methods are performed in more environmentally friendly solvents compared with the harmful organic solvents used in conventional organic electronic device fabrication processes. The nanoparticle dispersions and thin films have been examined and characterised by the use of a combination of spectroscopic and microscopic techniques. Subsequently, the nanoparticles have been used to fabricate two types of organic electronic devices: (a) nanoparticulate organic thin film transistors (NPOTFTs) and (b) nanoparticulate organic photovoltaics (NPOPVs). For the NPOTFT fabrication, we have successfully produced low voltage solution-processible top gate NPOTFTs based on hygroscopic dielectrics using both surfactant-containing and surfactant-free P3HT nanoparticle suspensions. The nanoparticulate devices exhibited similar I-V characteristics to transistors based on P3HT films processed from organic solvent. We have also used P3HT:PCBM nanoparticles (prepared by the mini-emulsion and precipitation methods) to fabricate NPOPVs which also achieved a comparable device performance to conventional OPV devices processed in organic solvents. We present preliminary data showing, for the first time, the use of surfactant-free P3HT:PCBM nanoparticles in NPOPV devices. In addition, the application of surfactant-containing nanoparticles to produce for the first time preliminary proof-of-concept printed NPOTFTs and printed NPOPVs based on aqueous dispersion active layer using inkjet printing technique is also presented.
Yu-Cheng, Hsu. "Molecular Ecology of Elegant Scops Owl (Otus elegans)." 2005. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2507200510162100.
Full text陳猛飛. "Study of process variation on P3HT-Based OTFTs." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/85869978277581240961.
Full text國立交通大學
電機學院微電子奈米科技產業專班
97
A procedure is studying and using the solution-process to fabricate P3HT-based organic thin film transistor. Using appropriated solvent and weight percentage is needed. And then the P3HT solution will be spun and deposited to be as active layer for organic electronic. P3HT organic material is to be classified to conjugated polymer. One of advantages is a property of self-organization and based on this structure to form a long chain. This long chain will be formed a lamella structure. If this lamella were packing closely, it would result a high regioregularity, which could obtain high mobility. Due to different process method, this lamella will be formed edge-on or face-on result. In my experiment, First of all, using chloroform to be a solvent with 0.1 weight percentages to fabricated OTFT can obtain better performance than xylene made, due to solubility and like dissolves like. Subsequently, we study the difference between regioregularity and molecular weight, two solutes were purchased from two different companies, dissolved them in the same solvent, chloroform. The result is that the difference of molecular weight is more importance than regioregularity. Moreover, fabricated by spin speed at 1500rpm and curing at 150℃ for 3 minutes can exhibit optimized result and in the meantime, observe that the oxygen concentration is less and less in the thin film analyzed by Auger electronic and ECSA surface elemental. Known a basic process procedure, there is a Schottky barrier between metal and organic material resulting less the current transport. However, S/D deposited with gold and an appropriated adhesion layer can reduce this barrier height, due to their closest work function and surface chemical property. In addition to previous results, to use surface treatment (HMDS) is a good idea to improve the packing and ordering for strong chain interaction and lead to exhibit high mobility and approximate to VG=0 of threshold voltage. In end of this thesis, we discuss about stability characteristics. Storage in the atmosphere, all of organic material will degrade as time goes by. This result is the same as P3HT polymer when it has been stored for one month. But the off current can be “healed” by annealing process at 180℃ for 30 minutes in furnace with N2 flow. Extra, low molecular weight comes to the same thing. Meanwhile, a device undergoing a serious process procedure can obtain a better performance, too. The on/off ratio is improved from 6x104 to 8~6x106; suspect that oxygen molecule can be driven off during annealing process. Unfortunately, the mobility is not to be improved and reduce down to 0.3x10-3 from 6x10-3 slightly and Vth is shifted to more negative, due to chain torsion. Last, constant voltage stress is applied to see how the drain current change. During stress, the drain increases with stress time going by when only drain electrode is applied at -60 voltages. There is no any gate current to be observed. We find out that the basic electrical result of the same device is changing after stress. A slight movement in off current, compared with just annealing one. So we suspect that the oxygen may diffuse into the film during stress.
Chen, Hong-jhe, and 陳弘哲. "Multi-chamber thin-film deposition for OTFT-application." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/94863789405456246182.
Full text國立臺灣科技大學
電子工程系
95
In this thesis, because organic material extraordinary sensitivity to aqueous vapor and oxygen, so last encapsulation make apparent extraordinary importance Cheng, we design in succession continuing Shen accumulate, make Cheng newly in view of this, are not sending to the glove case after completing the organic material, but encapsulate directly under the environment of vacuum of the same machine platform directly, this way not only can reduce aqueous vapor and invading chance of oxygen, can also not need to use glass as and seal covering again, reduce thickness and manufacturing cost of products greatly, too because this machine for make Cheng at low temperature platform, so can spend on making and application of the forgiving base plate in the future. In the course of experiment, we make from a new one Cheng find out suitable parameter and procedure most, design various material test ways, and erect various gas pipelines, in order to make out the intact finished product, as the final purpose. Finally, after designing and testing, we not only finish the erecting of new apparatus, finish, make best foundation of parameter Cheng newly too. Finish making of component even more, with have now, make component Cheng make performance and characteristic compare, probe into feasibility of practical application its in addition, until orientation march towards by direction larger in future.
Hsu, Yu-Cheng, and 許育誠. "Molecular Ecology of Elegant Scops Owl (Otus elegans)." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/08689464339765680683.
Full text國立臺灣大學
生態學與演化生物學研究所
93
Chapter 1 Isolation and characterization of microsatellite DNA markers from the Lanyu Scops Owl (Otus elegans botelensis) and their cross-species application in four species of strigidae Abstract From a genomic library enriched for GATA/CTAT and GAAA/CTTT repeats, eighteen polymorphic microsatellite markers were developed for the Lanyu Scops Owl (Otus elegans botelensis). Polymorphism of these loci was evaluated in a sample of 100 adult individuals of unknown relationship. The allele numbers of each locus were from 5 to 28 and the observed heterozygosity of each locus ranges from 0.59 to 0.95. All loci conformed to Hardy-Weinberg expectations. In addition, we cross-species tested these microsatellite primer pairs on four other species of owls (O. lettia, O. spilocephalus, O. sunia, and Ninox scutulata). Results showed that the degree of polymorphism decreased with increasing phylogenetic distance to O. elegans. Most loci (12, 15, and 18) were polymorphic in the three Otus owls but only five loci were polymorphic in N. scutulata. These microsatellites should be very useful genetic markers in studying the mating system, population genetics, and conservation genetics of other little studied Old World Otus owls. Chapter 2 Genetic mating system of Lanyu Scops Owls (Otus elegans botelensis) Abstract The genetic mating system is known for only a few species of owls. Most of them are genetically monogamous. The Lanyu Scops Owl (Otus elegans botelensis) breeds in high density in the forests of Lanyu (Orchid Island), southeast of Taiwan. Because extra-pair copulations (EPCs) have frequently been observed, we suspected a high degree of extra-pair fertilizations (EPFs). Using a set of 12 microsatellite loci, we assigned the parentage of 200 offspring from 108 families collected between 1999 and 2004. Parentage analysis revealed only two cases of parentage mismatch among 108 broods. The first case was most likely a case of brood usurpation, which would be the first case reported in the Strigidae. The second case was an EPF resulting in one offspring. Our study found that Lanyu Scops Owls are essentially genetically monogamous. Therefore, field monitoring data has provided reliable estimates of the lifetime reproductive success of this species. Chapter 3 Phylogeography of the Elegant Scops Owl (Otus elegans) on East Asian Islands Abstract The phylogeography of birds reflects the influence of both the geographic history of the area and the dispersal ability of the species. Islands have proven to be ideal sites for such studies due to the nature of their isolation. Elegant Scops Owl (Otus elegans) is a small owl found only in the forests of some East Asian islands. We used complete mitochondrial DNA (mtDNA) cytochrome b and NADH dehydrogenase subunit 6 genes (1665 bp in total) and 13 polymorphic microsatellite loci to analyze the population genetic structure of this owl on 10 islands in the Ryukyu Archipelago, Japan and on Lanyu (Orchid Island), Taiwan, in an attempt to infer the genetic diversity, population differentiation, gene flow, and demographic history of this species. Based on blood samples from 164 owls, we found higher genetic diversity on more northerly islands than on more southerly islands. No mtDNA variations were detected in remote island populations (Minami Daito and Lanyu). Pairwise Fst values between islands showed population differentiation on most islands. A deep divergence between northern and southern Ryukyu populations indicated a long period of north-south isolation. Bayesian estimation using the MDIV program revealed that the divergent time and the rate of gene flow differed among island pairs. Maximum likelihood estimates using MIGRATE found that the gene flow between islands was low and directionally asymmetrical, with a more northerly migration than the reverse. Maximum likelihood analysis using FLUCTUATE revealed that Ryukyu owl population sizes have been increasing since the last glaciation, but the rate of increase are lower in the north than in the south.
Cheng, Ting-shiuan, and 鄭庭軒. "Device Mechanism and Reliability of Pentacene-based OTFTs." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/69483939461982021262.
Full text國立交通大學
光電工程系所
94
Due to fixable, low temperature process and low cost, application of organic thin film transistor on flat plane display is very suitable to fabricate low cost device. Usually, surface treatment is used to increase mobility of carrier transport in organic thin film transistor. Until now, without anyone analyze reliability of device which is treated. Therefore this paper studies variation of device with and without surface treatment under different DC and AC stress condition. Firstly, we design Gated-Four-Probe (GFP) structure to extract characteristic of device in channel. Analysis of voltage distribution from Gated-Four-Probe can find that carrier transport mechanism of OTFT is consistent with carrier drift mechanism. Subsequently we fabricate Gated-Four-Probe (GFP) structure on different surface treatment substrate. The devices in this paper are separate to standard and two kinds of surface treatment. Standard device is cleaned by RCA clean and the other devices are treated by HMDS or ODMS. Initially, under DC stress condition we can find threshold voltage shift at positive gate bias stress is larger than at negative gate bias stress. Whether at positive or negative gate bias stress condition, Vth shift of devices with surface treatment are larger than standard devices. The extracted parameters from Gated-Four-Probe (GFP) indicate that pentacene film is not changed with time. Therefore reliability issues lie in the gate insulator or SAM layer degradation. Under AC stress condition, Vth shift of standard devices are obvious decrease. It appears that standard devices have better reliability at AC operation. But Vth shift of devices with HMDS and ODMS still have lager value.
Mong, Fan-Chi, and 孟繁琦. "Dielectric Hydroxyl Groups Effects in Pentacene-based OTFTs." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/40268470512697662826.
Full text國立交通大學
光電工程系所
97
Organic thin film transistors compared with the conventional amorphous silicon thin film transistors have many advantages, such as: low-temperature process, low cost, flexible ... and so on. However, poor reliability and short life time is its application greatest weaknesses. So far, carrier capture defects are recognized as the main reason that causes threshold voltage shift and mobility degradation. In this thesis, dielectric hydroxyl groups (OH groups) defects forming mechanism influenced by the environment is studied. We use methyl methacrylate (PMMA) and poly-4-vinyl phenol (PVP) as the dielectric surface treatment material and make two kinds of OTFTs. PVP-OTFTs have OH groups on its interface while PMMA-OTFTs do not. By comparing PMMA and PVP devices’ hysteresis in dark and under light, we find OH groups can form defects and trap electrons. Illumination will photogenerate electron-hole pair in the organic semiconductor and provides the source of trapped electrons.Then, PMMA and PVP devices positive gate bias stress experiment in dark/light environment indicated that positive gate bias stress can make semiconductor’s energy band bending, some originally do not filled defect states will tend to trap photogenerated electrons and thus cause threshold voltage shift. In addition, positive gate bias stress experiment taken in vacuum environment further proved OH group should react with H2O and O2 in the air then electron defects could be formed. OH groups defects can cause threshold voltage shift on matter it was in dark or light environment. In order to realize OTFTs’ application, passivation layer that could protect organic semiconductor from environment effect is needed. On the other hand, significant threshold voltage shift caused by OH groups implicate OTFTs application on moisture/light sensor.
Pan, Huang-Wei, and 潘皇維. "The DC/AC Reliability of Pentacene-based OTFT." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/90012163897659604515.
Full text國立交通大學
顯示科技研究所
95
As organic thin film transistor has lots of advantage of low temperature fabrication、low cost and easy fabrication, it has good potential for application on flexible display、sensor、radio-frequency identification tags and other electronics. Although studies have been made on DC gate bias stress without drain bias, the drain bias and AC bias stress in actual operation of organic electronic device is unknown. So we focus on the study of DC gate bias with drain bias stress and AC bias stress in this thesis. First, in the DC gate bias stress without drain bias, the dependence of the threshold voltage shift on the stressing time is found to follow a stretched-exponential function. It is the same as the many recent researchs. When the drain bias is applied, the threshold voltage shift will decrease and be suppressed as the drain bias becomes more negative. Since the threshold voltage shift is proportional to the carrier density, as the drain bias becomes more negative, the carrier concentration in channel is decrease such that the threshold voltage shift is reduced. Therefore, a channel charge normalization factor was used to describe the influence of drain bias and to modify the conventional stretched-exponential function. The threshold voltage shift has strong frequency dependence-the higher frequency same duty ratio, the smaller the magnitude of threshold voltage shift. We used an simple RC equivalent circuit to simulate the device under negative pulsed bias stress. The RC circuit consists of the insulator capacitance Ci, pentacene capacitance Cs, and a effective pentacene resistance Rs for hole conduction and injection. Th effective channel carrier concentration considering the RC delay can successfully explain the dependence of threshold voltage shift on the pulse width of the stressing signal. The channel charge normalization also can be used as the DC bias effect modeto describe the influence of AC bias stress and to modify the conventional stretched-exponential function.
Huang, Peng-Yi, and 黃鵬毅. "Soluble ADT and diamine-terphenyl derivatives for OTFT material." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/77804112553194711003.
Full text國立中央大學
化學研究所
95
Two new soluble organic semiconductor material systems were investigated. The first system is based on anthradithiophene (ADT), three new organic semiconductor materials: 5,11-dithien-2-ylanthradithiophene (DTADT), 5,11-bis(5-carbaldehydethien-2-yl)anthradithiophene (BATADT), and 5,11-bis(5-carbaldbutylaminothien-2-yl)anthradithiophene (BBTADT) were synthesized. The second system is based on p-terphenyl diamine (TDA), two new organic semiconductor materials: N,N’-bis[(5-butyl-2-thienyl)methylene]-p-terphenyl diamine (BTTDA), and N,N’-bis[(5-triethylsilyl-2-thienyl)methylene]-p-terphenyl diamine (TES-TTDA) were prepared. BATADT with an electron withdrawing aldehyde functional group on the central thiophene shows the stability enhancement and demonstrates a p-type character with current mobility of 2.1x10-5 cm2/Vs, on/off ratio ~ 104 and threshold voltage -31V. The devices fabrication of all the five materials are currently assisted by Tobin J. Marks group at Northwestern University, where the solution process and vacuum deposition will be examined. Hopefully, better mobilities and easier fabrication will be obtained in the future.
Song, Ho-Tsung, and 宋和璁. "The Application of Aluminum Nitride on Pentacene Based OTFTs." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/69969215165430112414.
Full text國立交通大學
顯示科技研究所
96
The study of pentacene based organic thin film transistors (OTFTs) has been a major area of research on organic semiconducting materials and devices. OTFTs have many advantages such as low process temperature, low cost and simple process fabrication, structure flexibility. However, the high operating-voltage remains a limitation on organic transistors. To lowering the operating-voltage, a high-k materials, aluminum nitride (AlN), has been proposed as a low operating-voltage gate-dielectrics in pentacene based OTFTs. This work was studied with my senior classmate, Cheng-Wei Chou. In this thesis, the AlN dielectric application and aging effect in pentacene based OTFTs are reported. To prevent cross-talk between transistors in close proximity and to achieve a low off-current in OTFTs array, it is necessary to pattern the organic semiconductor layer. A pentacene patterning method on the AlN dielectric surface that can be combined with conventional lithography to pattern pentacene film was reported. The AlN surface was patterned using a conventional photo lithography process and then treated with oxygen (O2) plasma on uncovered AlN to modify surface polarity. The surface energy of O2 plasma treated region was increased drastically. Following pentacene deposition, the sample was dipped in water to remove pentacene from the O2 plasma treated area. The polar surface energy was attributed to the increase of Al-O bonds on the surface based on XPS measurements. The enhancement of the polar surface energy explains the water-removable pentacene patterning mechanism. Likewise, the lowered AlN surface energy over time when the AlN film stored aged in a non-vacuum environment was observed. To confirm the AlN aging effect, the relationship between the aged AlN film and the pentacene based OTFTs were demonstrated in this thesis. The lowered surface energy over the aging time was due to the carbon absorption on the AlN surface. Pentacene based OTFTs fabricated on the aged AlN surface showed a higher performance in electrical characteristics. The mobility was enhanced from 0.05 cm2/Vs to 0.67 cm2/Vs with the limited aging time (14 days). This improved mobility was due to the carbon accumulation on the AlN surface, lowers the surface energy and increased the pentacene coverage in the first few layers.
Wu, Cheng-Hua, and 吳承華. "The Effect of Illumination for Characteristics of Pentacene-OTFTs." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/23059866459329841758.
Full text國立成功大學
光電科學與工程研究所
94
Thin film transistors (TFTs) based on conjugated organic materials, both small molecules and polymers have emerged recently due to their potential in low-cost, low-temperature fabrication and, the possibility of producing flexible devices. Several groups have proposed or reported successful integration of such devices with Organic light-emitting diodes. The OTFTs exhibiting photoresponsivity, which could act as light sensors, photoswitches or optoelectronic memory elements, open new avenues of research into promising device applications. In our study, we investigated the effect of illumination for characteristics of Pentacene-OTFTs when they integrated with OLEDs. And we found that the Pentacene-OTFTs can be operated as light sensors and optoelectronic memory devices. In first part, we observed the characteristics of Pentacene-OTFFs were affected by illumination. And we observed full recovery of these devices after the illumination was removed at room temperature. In second part, we investigated the dependence between characteristics of Pentacene-OTFTs and illumination intensity. We found that the performance of Pentacene-OTFTs decreased with increasing illumination intensity. In third part, we investigated the characteristics of Pentacene-OTFTs under illumination for a long time. We observed the performance of Pentacene-OTFTs decreased with increasing illumination time. In final part, we found that the Pentacene-OTFTs are sensitive to light signal, but they can not be operated as a fast photodetectors because of their slow response time. But, maybe they can be used as optoelectronic memory elements. In conclusion, the Pentacene-OTFTs were sensitive to light signal, and the performance decreased significantly with illumination.
Zhang, Pi Lie, and 張丕烈. "Novel current-mode circuits using CCIIs, OTAs or CFAs." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/44293336321499237114.
Full textFraitágová, Iveta. "Migrace kalouse ušatého (Asio otus) v podmínkách střední Evropy." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-334761.
Full textTang, Jia-Shuian, and 湯佳軒. "Study on OTFTs with 3-D Multiple Nano Channels." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/81373509049580321010.
Full text國立暨南國際大學
電機工程學系
100
In this thesis, the characterizations of OTFTs with 3-D multiple nano channels were studied. The nano channels were fabricated using nanoimprint lithography and reactive ion etching. To improve the preferred orientation of pentacene, the self-assembled layer was used for the SiO2 and HfO2 dielectrics. The pentacene and S/D electrode were deposited by thermal evaporation. The surface morphologies and cross-sections of samples were investigated by AFM and SEM. The device performances were studied by HP-4156 and HP-4294. In our results, from the SEM images, the nano channels with various line/space ratios were fabricated successfully. In the AFM images, the preferred orientations of pentacene were improved with the line/space ratio of about 1/2. Besides, the OTFTs on the nano channels with the line/space ratio of about 1/2 and line/space of about 600/1200 nm show the best performance among all samples. The proposed process will be suitable for the future flexible electronics applications.
Rega, Romina. "OTFTs FOR ELECTRONIC SYSTEMS:DEVICES FABRICATION, CHARACTERISATION, ANALYSIS AND RELIABILITY." Tesi di dottorato, 2014. http://www.fedoa.unina.it/9921/1/PhD.%20REGA_ROMINA.pdf.
Full textIsmail, Ahmad G. "Photolithography Patterning of Complementary Organic Circuits." Thesis, 2011. http://hdl.handle.net/10222/13691.
Full textBravencová, Lada. "Restrukturalizace podniku." Master's thesis, 2008. http://www.nusl.cz/ntk/nusl-94403.
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