Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"OFET"”.
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Towards cheap, portable and reliable OFET-based biochemical sensors
… organic field-effect transistors (EGOFETs), organic electrochemical transistors (OECTs), and extended-gate organic field-effect transistors (Charge-Modulated and Ex-gate OFETs) have gained significant attention in the scientific community. Although numerous papers have reported …
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Water stability of organic and electrolyte-gated field-effect transistors
… such as the Organic Field Effect Transistor (OFET), the Electrolyte-Gated OFET (EG-OFET), and the Organic Electro-Chemical Transistor (OECT). However, water constitutes a key factor in charge trapping and device degradation in organic materials, due to its strong dipole moment, high dielectric …
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Small molecules based on novel electron-deficient acceptor units for organic electronic applications
… units used, the principles behind OPV and OFET devices and how organic semiconductors can be optimised in order to produce the best working devices.The synthesis, physical properties and OPV performance of materials based on naphthyridine-2,6-dione acceptor unit are presented in chapter 2, …
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Improving the Stability of Organic Field-Effect Transistors
… organic field-effect transistors (OFETs) have evolved from a convenient tool for semiconductor parameter analysis to a technology slowly entering the market as circuit components in flexible electronics. Since the first devices in the 1980s, OFET mobilities have increased by over …
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Improved Organic Semiconductor Thin-Film Formation through the Addition of Vibrations to the Solution Shearing Method
… for organic field-effect transistors (OFETs) are investigated. Electrical performance for OFETs is currently still limited by the charge carrier mobility, especially when high fabrication speeds are required. In this work, adaptations are made to the solution shearing method to enhance …
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Morphology-Property Relationship for Binary Organic Thin Films
… range from organic field-effect transistors (OFET), organic solar cells (OSC), to organic light emitting diodes (OLEDs). Compared with pure component films, binary organic thin films (BOTF) allows for novel characteristics and specialized features to handle more demanding tasks. Due to the …
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Thiophen und Benzodithiophen basierte organische Halbleiter für aus Lösung prozessierbare Feldeffekttransistoren
… amorphes Verhalten in den Halbleiterschichten in OFETs auf und es werden Mobilitäten bis zu 10-4 cm2/Vs erreicht. Eine Abhängigkeit der Bauteil-Leistung von dem Zinngehalt-Rest im Polymer wird nachgewiesen. Ein Zinngehalt von über 0.6 % kann enormen Einfluss auf die Mobilität ausüben, da die …
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Non-volatile organic memory devices: from design to applications
… highly flexible Organic Field-Effect Transistor (OFET)-based memory elements with excellent mechanical stability and high retention time were developed. As main innovation with respect to the state of the art, low voltage operation of the OFET-based memory was investigated. Such an activity was …
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Synthesis of fluoromodified carbon rich electron acceptors and exploration of their structural, electronic, and device properties
… favorable characteristics were then utilized in OFET devices as n-type semiconductors resulting in record-setting charge carrier mobilities.
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New Carbazole Based Materials for Optoelectronic Applications
… stable materials based on aromatic amines for OFET and OLED applications. The preparation of high quality thin films from solution as well as from the gas phase was an another important issue. The first part of this thesis deals with star-shaped molecular glasses with triphenylamine as core …
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Synthesis and characterisation of novel organic semiconductors
… along with the results of the performance of an OFET device, which was fabricated with 77 as the active semiconductor. Further work with the DITT-based materials involved polymerisations of 78 and 79 via a Yamamoto protocol and also copolymerisations of 78 with the fluorene and paraphenylene …
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New fluorene based materials for organic electronics
… (OLEDs) and organic field effect transistors (OFETs). The first part of my thesis deals with the synthesis of reactive mesogens with conjugated fluorene units and acrylate end groups as photopolymeriseable species. They were prepared by Suzuki cross coupling reactions with the use of a …
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The Integration and Applications of Organic Thin Film Transistors and Ferroelectric Polymers
… the gate of the organic thin film transistors (OFET) using an arrangement that allows the full piezoelectric voltage to couple to the channel, while also increasing the charge retention time. A bipolar detector is created by using a UV-Ozone treatment to shift the threshold voltage and increase …
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Functional organic thin films under extreme confinement
… critical thickness. In addition, I fabricated OFET-based sensors incorporating ultrathin films of polymers which showed sensitivity of ~83% to ammonia vapors of ~1ppb concentration. Next, I explored into graphene surfaces as a template for monolayer films of polymers (Chapter 5) and observed …
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Enhancing the Electrical Performance of Organic Field-Effect Transistors Through Interface Engineering
… materials. Organic field-effect transistors (OFETs) fabricated from solution-based methods create pathways to fabricating electronic applications that are: flexible, transparent, large-area, low-power consuming, and/or even wearable.
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Nanoelectronic Devices using Carbon Nanotubes and Graphene Electrodes: Fabrication and Electronic Transport Investigations
… organic field-effect transistors (OFETs) using different types of graphene electrodes. I show that the performance of OFETs with pentacene as OSC and RGO as electrode can be continuously improved by increasing the carbon sp2 fraction of RGO. The carbon sp2 fractions of RGO were …
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SYNTHESIS OF CONJUGATED SMALL MOLECULES AND POLYMERS BY A PALLADIUM CATALYZED CYCLOPENTANNULATION STRATEGY – TOWARDS NEW ORGANIC SEMICONDUCTORS
The utility of conjugated small molecules and polymers as organic semiconductors have seen a tremendous growth in research and development in academia as well as industry because of their processability and flexibility advantages in comparison to inorganic semiconductors. The extensive research …
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Neue Materialien für optoelektronische und elektronische Bauteile
… (OLED) oder organische Transistoren (OFET) eingesetzt wurden. Molekular einheitliche, niedermolekulare Verbindungen können in hochreiner Form erhalten werden. Sie besitzen keine Endgruppen und zeigen keine Verteilung von physikalischen Eigenschaften. Die Verbindungen sollen eine …
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Tailoring functional Π-conjugated polymers and molecules for organic photovoltaic applications
… amphiphilic conjugated molecules. Both OPV and OFET performances will be discussed, showing the use of Langmuir-Blodgett deposition to create well-ordered material layers in organic electronic applications. Despite its popularity as a universal acceptor in an OPV device, fullerene derivatives …
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Fundamental investigations on periodic nano- and microstructured organic solar cells
… integration of Organic Field Effect Transistors (OFET) and Organic Light Emitting Diodes (OLED) to all-polymer electronic devices is still under development. Nevertheless, the integration of organic solar cells as one functional component appears promising as the production technologies are …
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