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 21 for “"organic devices"”.
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Structure-Property Correlation of Electron Transport Materials in Organic Devices
This dissertation deals with organic semiconductors as electron acceptor (n-type) materials in bulk heterojunction (BHJ) solar cells. Important features of an electron acceptor are strong visible light absorption, sufficient high electron mobility and appropriate energy levels with respect to the …
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Electrical characterization of organic devices: case study: polythiophene-fullerene based solar cells
… Electrical and optical properties of these organic devices were studied together with the dependence of current-voltage characteristics on temperature and illumination intensity. The increase of the short circuit current density with temperature is evidence of a thermally activated transport …
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Design and synthesis of new processable materials for application in organic devices.
… chains that allowed the dispersion in nonorganic and toxic solvents. All molecules were characterized through NMR and IR spectroscopy; in addition, physicochemical properties of the derivatives including solubility in variety of solvents, solution and film absorption and emission, and …
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Charges and Excitons in Organic and Pervoskite Light Emitting Materials and Devices
Charge balance in organic light emitting structures is essential to simultaneously achieving high brightness and high efficiency. In DC-driven OLEDs, this is relatively straight forward. However, in the newly emerging, capacitive, field-activated AC-driven organic devices, charge balance can be a …
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Field effect investigations of charge carrier transport in organic semiconductors
Organic semiconductors are potentially a cost and energy effective alternative to conventional technologies. The understanding of charge transport in these materials and minimizing electrical losses in organic devices is essential to improve device output. In this thesis the transport properties of …
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Generation of photocurrent from Photosystem I biomolecular complexes
Photosynthetic proteins are used in organic devices to generate photocurrent. A setup consisting of a monochromator and lock-in amplifiers is used to measure the photocurrent along with an HP4156 analyzer. Atomic force microscopy images are also taken including those taken with a voltage-biased …
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Organic Semiconducing Thin Films: Device Applications and Beyond
Organic semiconductors show great promise for device applications, particularly as organic thin film transistors (OTFTs) and organic photovoltaics (OPVs), due to their potential for low cost, high volume fabrication when compared to traditional inorganic semiconductors. While the performance of …
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Designing a Simulator for an Electrically-Pumped Organic Laser Diode
<p>Organic semiconductors provide an alternative set of basis materials to fabricate electronic devices like PN Junctions, LEDs, and FETs. These materials have several benefits over traditional inorganic semiconductors including their mechanical flexibility, reliance on renewable resources, and …
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Correlation between interface-dependent properties and electrical performances in OFETs
… in determining the electrical performances in organic devices is that, even though they are usually thought as macroscopic devices, their behaviour is strongly driven by interfacial phenomena taking place in the nano scale. The focus of this thesis is the realization and characterization of …
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Modeling non-radiative processes in solar materials
… properties of a variety of systems relevant to organic photovoltaics. The second chapter examines how to predict the radiative and non-radiative decay rates of a large family of naphthalene derivatives. Naphthalene is a common building block in many organic electronic devices and possesses …
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Electronic charge injection and transport in organic field-effect transistors
Electronic devices based on organic semiconductors, such as field-effect transistors (FETs) and light emitting diodes have attracted much interest as possible inexpensive and flexible alternatives to inorganic devices. Despite considerable improvement in device properties, a better understanding of …
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The Bilayer Polymer Light-Emitting Electrochemical Cells
… cells (LECs) are solid-state polymer devices that form light-emitting p-n junctions in situ from electrochemical doping, which occurs under an applied voltage or current bias. LECs typically consist of a combination of a luminescent polymer, an electrolyte polymer, and a salt. This …
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Computational and experimental studies of acenes, starphenes and [60]fullerene derivatives
… derivatives is described. Acenes are promising organic semiconductors. Hybrid density functional theory applying a triple-zeta valence basis set (B3LYP/6-311+G**) has been used to approximate the HOMO - LUMO excitation gap in various substituted pentacenes. This technique may, in part, …
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Organic lasers and nanostructred organic films for hybrid integration
… polymers (LEPs) are a promising category of organic materials for photonic applications owing to their potential for simple fabrication and availability of materials emitting across the whole visible spectrum. LEPs are already exploited commercially in the case organic light emitting diodes …
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Transient optical and electrical effects in polymeric semiconductors
… cells and transistors based on highly purified inorganic crystals over the past decades. Organic semiconductors, notably polymeric, are a comparatively young field of research, the first light-emitting diode based on conjugated polymers having been demonstrated in 1990. Polymeric semiconductors …
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New Methods for the Investigation of Organic Thin-Film Devices
… new techniques for the investigation of organic thin-film devices and have focussed on properties on the molecular scale as well as on macroscopic properties of organic devices. Scanning probe techniques were used to obtain spatially resolved information on morphology and electro-optical …
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Excitons in Self-Assembled Hybrid Systems of Molecular Aggregate Light-Harvesting Nanotubes: Charge-Transfer Substrates and Solution-Stabilized Nanocomposites
… as well as progress in the development of organic solar cells, the possibility of using bio-inspired molecular nanostructures for large-scale solar energy conversion has not been realized yet. The persistent limitations in translating natures design principles for applications in …
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Understanding transport processes of organic semiconductors via magnetic resonance methods
… last decade has witnessed a huge development of organic semiconducting materials, including the boost in the discoveries of new materials for outstanding optoelectronic performance, as well as the rise of new application scenarios such as flexible electronics, biocompatible sensors, and inkjet …
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Single Molecule Junction Conductance and Binding Geometry
… problem of controlling transport through a metal-organic interface by studying electronic and mechanical properties of single organic molecule-metal junctions. Using a Scanning Tunneling Microscope (STM) we image, probe energy-level alignment and perform STM-based break junction (BJ) measurements …
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Monitoring Biological Events on Native Cell Membranes with Organic Bioelectronics
… bilayers (SLBs) integrated with bioelectronic devices, is able to rapidly sense drug responses from cell membrane. This system eliminates the complexities and challenges of traditional testing systems, such as sterile cell-culture environments or physiological monitoring of animals. Also, …
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