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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 19 of 19 for “"Fullerene derivatives"”.
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Synthesis of highly quenching fullerene derivatives for biosensor applications
This dissertation examines the synthesis of fullerene-based fluorescence quenchers for numerous biosensor applications. The Introduction describes the need for biosensors in our society, what they are and various biosensing schemes that are currently being worked on in our group. Chapter One …
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Computational and experimental studies of acenes, starphenes and [60]fullerene derivatives
… studies of acenes, starphenes and [60]fullerene 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 …
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The functionalization of fullerenes and nanocarbon materials for photovoltaics and other applications
Fullerenes and other nanocarbon materials such as carbon nanotubes possess interesting chemical and physical properties. In this thesis, we explore various functionalization methods for nanocarbon materials and their potential applications in photovoltaics and fuel cells. Chapter 1 gives an …
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Optische und elektrische Spektroskopie an alternativen Absorbermaterialien für organische Solarzellen
… Optical measurements on polymers and polymer-fullerene blends are shown to demonstrate, in principle, if these materials and material combinations are suitable for organic solar cell applications. An optimal post-heat treatment of the PEDOT:PSS interfacial layer in the organic solar cell is …
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Barium Oxide as an Intermediate Layer for Polymer Tandem Solar Cell
… 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 intermediate layers such as ZnO/MoO3 …
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Novel resist materials for next generation lithography
Fullerene derivatives have been demonstrated as negative-tone resists for electron beam lithography with impressive capability for high resolution and high plasma etching resistance, due to their carbon-rich nature. Their primary drawback of extremely poor sensitivity has been addressed by …
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Fluorine-containing fullerenes and endometallofullerenes: synthesis, structure, and spectroscopic characterization
… members of a relatively new class of exohedral fullerene derivatives with fluorine-containing electron-withdrawing groups have been prepared and studied by spectroscopic methods and X-ray crystallography. The fluorination and/or perfluoroalkylation reactions were performed with C60, C70, the …
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The interplay of nanostructure and efficiency of polymer solar cells
… for polymers in combination with soluble fullerene-derivatives or nanocrystalline inorganic semiconductors as the electron-accepting component. The finding that proper processing of polymer-vinazene devices leads to similar high values is a major step towards the design of efficient …
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The Effect of Morphology on Carrier Dynamics in Solution Processed Solar Cells
… effect of changes to the functional groups of fullerenes on bulk heterojunction morphology is then explored. Samples of three new fullerene derivatives are prepared and compared to PCBM. The changes in film morphology with these materials are studied with Atomic Force Microscopy (AFM), …
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Synthesis and biological studies of a fullerene-Taxol conjugate and fullerene-based transfection vectors
Fullerene (C60) derivatives have been extensively studied for a variety of medical applications, which include neuroprotective agents, HIV-1 protease inhibitors, photosensitizers for photodynamic therapy, MRI contrast agents, and radiopharmaceuticals. The first part of this work is dedicated to the …
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Generation, recombination and extraction of charges in polymer
… conjugated polymers in combination with soluble fullerene derivatives has been achieved over the past years. Certified and reported power conversion efficiencies now reach over 9% for single junctions and exceed the 10% benchmark for tandem solar cells. This trend brightens the vision of organic …
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P3HT:PCBM-based organic solar cells : Optimisation of active layer nanostructure and interface properties.
… P3HT has been blended with different fullerene derivatives (PC[60]BM, PC[61]BM, PC[70]BM and PC[71]BM) and the active layers were processed using the optimum solvent as well as optimum film's thickness.These PCBM derivatives have different lower unoccupied molecular level (LUMO) and …
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ADDITIVES FOR THE IMPROVEMENT OF THE PERFORMANCE OF ORGANIC AND HYBRID PHOTOVOLTAIC
… in ternary solar cells. In this work, two fullerene derivatives have been used as additive acceptor or third component in inverted solar cells with a PCE of over 14%. The introduction of the fullerene derivative astonishingly enhanced the long-term stability of the blend retaining its PCE …
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DFT study of doped and functionalized fullerene based materials for lithium-ion battery applications
… (LIBs). The rich chemistry of carbon allows fullerene based materials to be doped and functionalized and thereby their properties can be tailored in a specific direction. Recently, devices based on functionalized CNTs and showing high energy and power densities have been fabricated. In these …
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Tailoring functional Π-conjugated polymers and molecules for organic photovoltaic applications
… as a universal acceptor in an OPV device, fullerene derivatives have high production cost, weak absorption, and limited chemical stability. To improve device performance, the OPV field has focused on designing non-fullerene acceptors. The next section of this dissertation will first …
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Structure-Property Correlation of Electron Transport Materials in Organic Devices
… The second part of this dissertation addresses fullerene based acceptor materials, among which Phenyl-C61-butyric acid methyl ester (PCBM) is the state-of-the-art n-type semiconductor used in OPV. For two fullerene derivatives, Bis-Phenyl-C61-butyric acid methyl ester (bis-PCBM) and …
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Engineering nanocarbon interfaces for electron transfer
… electron transfer events between SWCNTs and fullerenes. This electron transfer system is distinct from the diazonium system since it does not result in the formation of a covalent bond between the donor and acceptor species. To study this interface, we synthesized a series of methanofullerene …