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 32 for “"Semiconducting polymers"”.
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Thermal conductivity in organic semiconducting polymers
… and lower thermal conductivity; certain organic semiconducting polymers were considered to be potential candidates, and in this work thermal conductivity in these materials was particularly explored. This thesis started with accurate experimental measurements of in-plane thermal conductivity for …
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Crystallization, biomimetics and semiconducting polymers in confined systems
populärwissenschaftlicher Abstract: Kristallisation, Biomimetik und halbleitende Polymere in räumlich begrenzten Systemen: Öl und Wasser mischen sich nicht, man kann aber aus beiden Flüssigkeiten Emulsionen herstellen, bei denen Tröpfchen der einen Flüssigkeit in der anderen Flüssigkeit vorliegen. …
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Stabilising Semiconducting Polymers Using Solid State Molecular Additives
Solution processed organic semiconductors contain extrinsic environmental species that cause device instabilities as they are difficult to remove during low temperature processing and are able to penetrate into organic electronics after fabrication. This dissertation is centered on the search for …
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Triphenylamine based semiconducting polymers for organic/hybrid photovoltaics and sensors
… Anbindung des Akzeptors an die Seitenkette des Polymers. Diese Strategien wurden in dieser Arbeit verglichen, um den Einfluss auf die Exzitionendelokalisierung und den Effekt des Ladungstransfercharakters auf den Ladungstransport zu verstehen. Zusätzlich wurde die Ladungstrennung in …
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Dynamic-template-directed crystallization of semiconducting polymers for organic electronics
Solution processable semiconducting polymers have been under intense investigations due to their potential applications in large-area printed electronics from solar cells to biomedical devices. However, controlling the multiscale morphology and device performance of printed polymer thin films …
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Thin Films of Semiconducting Polymers and Block Copolymers by Surface-initiated Polymerization
… morphology and molecular organization in organic semiconducting polymer thin films is an important prerequisite for enhancing the efficiency of organic thin-film devices, including organic light-emitting and photovoltaic devices. The current “top-down” paradigm for making such devices is based on …
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Oxidative chemical vapor deposition of semiconducting polymers and their use In organic photovoltaics
… and unique functionalities. OPVs employing semiconducting polymers in the photoactive layer have traditionally been fabricated almost exclusively with solution-based techniques due to a lack of suitable alternatives. This has thus limited polymer solar cells and other polymer electronic …
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Calcium vapour deposition on semiconducting polymers studied by adsorption calorimetry and visible light absorption
… study the interaction between calcium and three polymers: MEH-PPV, MEH-PPP and P3HT. All three polymers behave differently in their reaction kinetics with calcium. On MEH-PPV we measure 45 μJ/cm² of heat generated in excess of the heat of bulk metal growth, 120 μJ/cm² for MEH-PPP, and 100 μJ/cm² …
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Atomistic simulation of self-organization in semiconducting polymers and polypeptides with molecular dynamics and Monte Carlo methodologies
… molecules (typical examples include organic semiconducting polymers and polypeptides), chain self-organization at the nanoscale and mesoscale completely controls their macroscopic behavior and functionality. Although the equilibrium structure of many of these systems is rather well-known …
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Preparation and Characterization of Single Walled Carbon Nanotubes Poly(3-hexylthiophene) Nanohybrids
… prepare composite materials in conjunction with semiconducting polymers. Electrical and optical properties of this composite material were investigated and finally a nanostructuring technique able to create thin hybrid films with nanoscale phase separation was developed.
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INFLUENCE OF MOLECULAR STRUCTURES ON THE PROPERTIES OF COMPLEMENTARY SEMICONDUCTING POLYMER BLENDS
Semiconducting polymers are considered as the materials for the next generation large-area and flexible electronics. In the past several decades, extensive effort has been to understand and improve the charge transport properties of semiconducting polymers. Chapter one is an introduction to organic …
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Studies in the synthesis and impurity profiling of pharmacologically active benzodifurans
… transistors, solar cell sensitizers and semiconducting polymers. The synthesis of pharmacologically active benzodifurans are complex multi-step processes and each individual step has the potential for considerable side-product/impurity formation. This project focused on synthetic …
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Barium Oxide as an Intermediate Layer for Polymer Tandem Solar Cell
… Bulk Heterojunction (BHJ) materials comprising semiconducting polymers and fullerene derivatives. For years, tremendous efforts have been put in seeking for an efficient intermediate layer to successfully connect two sub-cells together in the tandem structure. Even though many kinds of …
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Nanoscale Systems for Optical, Electro-Optic, and Spintronic Applications
… materials and assemblies based on : i) semiconducting polymers coupled with metallic single-walled carbon nanotubes (m-SWNTs) and semiconducting single-walled carbon nanotubes (s-SWNT), ii) ethyne bridged zinc (II) porphyrin arrays covalently linked to polypeptides, and iii) lanthanide …
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Morphology and Conformation of Polythiophene Derivatives in Anisotropic Core-Shell Nanocomposites and Solution
<p>Conjugated semiconducting polymers have garnered substantial interest in recent years due to the potential for use in various applications, particularly in the field of electronic devices such as photovoltaic cells and light emitting diodes. Conjugated polymers offer numerous advantages in these …
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Applications of thermophysical characterization using the 3-omega technique
… temperature dependent thermal conductivity of polymers, an empirical model is proposed to aid in predicting temperature-dependent thermal conductivity of amorphous polymers. The model depends on only the density, monomer molecular weight, and speed of sound, and its predictions are validated …
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Design, synthesis and characterization of thiazole-based conjugated polymers and their applications to n-channel organic electronics
… decades, π-conjugated organic and polymeric semiconducting materials have attracted significant attention due to their promising electronic and optoelectronic properties. Therefore, their potential in applications to electronic and optoelectronic devices have been investigated, including …
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Fabrication and applications of fluorescent polymer fibres
… studies the manufacture, and properties, of semiconducting polymers in fibrous (cylindrical) geometries and their use in applications such as explosives sensing and as luminescent concentrators. The main method of fabrication used in this thesis is electrospinning. A method was developed to …
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Functional heterointerfaces via electromodulation spectroscopy
… devices made with solution-processable semiconducting polymers. Investigations on the electronic structures across these heterointerfaces are performed with the combined use of electromodulation and photoemission spectroscopic techniques. Electromodulation and ultraviolet photoemission …
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Fully printed transistors employing silicon nanoparticles
… has so far been focussed on the use of organic semiconducting polymers to produce organic field-effect transistors (OFETs). However, research has also been undertaken regarding the use of inorganic semiconductors, including for example, transparent metal oxides, compound semiconductors and …
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