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 26 for “"TRANSPORT MATERIALS"”.
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Structure-Property Correlation of Electron Transport Materials in Organic Devices
… 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 donor. Furthermore, the blend …
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Electroactive Conjugated Polymers as Charge-Transport Materials for Optoelectronic Thin-Film Devices
… of an OLED within one material: the transport of positive and negative charges and the formation of emissive excited states. With the carbazole-substituted oxadiazoles 1–3 it was shown that on the one hand the carbazole functionality is suitable for enabling the electrochemical …
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Novel dopants for n-type doping of electron transport materials: cationic dyes and their bases
… succeed in shifting the Fermi level towards the transport states, this could reduce ohmic losses, ease carrier injection from contacts and increase the built-in potential of Schottky- or pn-junctions.
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Design and synthesis of nanocrystal heterostructures for optoelectronic applications
… of QD-OLED function has led to improved organic transport materials. These QD-OLED devices can also be redesigned using inorganic hole and electron transport materials to produce inorganic QD-LEDs (QD-ILEDs) with EQE as high as 0.1%. Inorganic transport layers are more robust to solvents and …
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Liquid crystalline semiconductors for organic electronics
… and evaluation of novel liquid crystalline materials with light-emitting and or charge-transporting properties. Some of the liquid crystals (LCs) synthesised incorporate photopolymerisable diene or methacrylate end groups, situated at the peripheries of the molecular core. These …
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Transport of Molecular Cargoes By Coordination Cages Between Immiscible Liquid Phases
Directed transport of materials against chemical potential gradients is a fundamental feature of living systems, underpinning processes that range from transport through cell membranes to neurotransmission. The development of artificial active cargo transport could enable new modes of chemical …
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The Stability of PbS Quantum Dot Solar Cells
… electrode migration-induced degradation in hole transport layer-free QD solar cells, highlighting the need to consider diffusion barrier properties when evaluating next-generation hole transport materials.
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N-type doping of organic thin films using a novel class of dopants
… field effect study are interpreted in terms of transport in disordered solids. Detailed mass spectroscopic investigation are carried out to investigate the sublimation behaviour of the organic salt pyronin B chloride. We conclude that mainly HCl and the leuco base of pyronin B is present in the …
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Synthesis of side-chain polystyrenes for all organic solution processed OLEDs
… differ to each other in the type of charge transport exhibited, either ambipolar transport or electron transport. All materials were applied in all-organic solution processed green Ir-based devices. In the first part, a series of ambipolar host materials were developed to transport both …
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Electron- and ion-conducting metal-organic frameworks
… MOFs, including a review of the reported materials exhibiting such behavior. Chapter 2 describes new MOFs designed using through-space charge transport strategies, as introduced in Chapter 1. Chapter 2 discusses four isostructural materials of general formula M2(TTFTB) (M = Mn, Co, Zn, and …
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First Principle Modeling of Hybrid Halide Perovskites for Optoelectronic Applications
… high-power computing clusters. In this work, HP materials are studied using ab-initio methods to study the ground state and excited state properties. A model used in oxide perovskites is shown to work well in HPs to model polaronic properties, as these materials exhibit ionic bonding and …
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Studies on the synthesis and the transport properties of organic materials
… of photo-crosslinkable arylamine-based hole-transport copolymers has been synthesized. The synthetic methodology employed allows for the redox potential of the polymer to be tuned by the incorporation of electron-donating or withdrawing moieties. Upon exposure to ultraviolet radiation, the …
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Spin Transport in Organic Semiconductors
… in the past decade may lead to organic spin transport materials with both long spin diffusion length and spin lifetime which is important for spintronics applications. This dissertation explores the spin transport in organic semiconductors using a variety of experimental techniques from all …
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Synthesis and testing of novel polypeptides for biological applications
… these ordered systems produce high-strength materials, provide physical cues to induce cell functions and morphologies, efficiently harvest energy, and transport materials. One of the key challenges in the field of polymer chemistry is the ability to generate synthetic systems that can …
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Systematic studies on structural and optical properties of organic thin films on inorganic substrates
… organic compounds are employed as active materials in a variety of applications,including organic light emitting diodes (OLEDs) and organic thin film transistor (OTFTs). These devices consisting of sequentially deposited layers of organic materials have been demonstrated with active device …
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Development of hybrid inorganic-organic light-emitting devices with metal oxide charge transport layers
… lifetime. Balanced charge injection and transport is vital for improving the device efficiency which demands for selection of better charge injection and transport materials. In addition imbalanced charge injection also degrades the device via joule's heating and charge accumulation …
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Digital material skins : for reversible reusable pressure vessels
… of discarding hardware, since the cost to transport materials from Earth is extremely high. Significant improvements need to be made in recovery and reuse of valuable hardware, to be able to lower costs per mission and increase the number of missions. Strategies need to focus on avoiding …
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Multivalent Random Walkers:A computational model of superdiffusive transport at the nanoscale
… a synthetic nanoscale walker that can be used to transport materials and information at superdiffusive rates in artificial molecular systems. Our \emph{multivalent random walker} model describes the motion of a walker with a rigid, inert body and flexible, enzymatic legs. A leg can bind to and …
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Design Strategies for Dynamic Self-assembled Protein Materials
… has driven research into bio-inspired materials where scientists investigate the complex relationship between sequence, structure and function of these materials. A good illustrative example of the effect that hierarchical structure can have is a brick wall. Bricks are laid so that the …
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Moving beyond the stream reach: Assessing how confluences alter ecosystem function and water quality in freshwater networks
… the surrounding landscape. Streams receive and transport materials from upstream and terrestrial sources that support in-stream ecosystem processes and regulate downstream water quality. Understanding how these processes within a stream alter downstream carbon and nutrient fluxes is needed to …
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