Sökning: "bipolarons"

Visar resultat 1 - 5 av 7 avhandlingar innehållade ordet bipolarons.

  1. 1. Point-contact versus sandwich-type tunneling in high-TC junctions: Reconciliation within a local-pair model

    Författare :Magnus Hurd; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Anderson model; tunneling spectroscopy; high-temperature superconductors; localized electron states; bipolarons;

    Sammanfattning : .... LÄS MER

  3. 2. Electronic and optical properties of conducting polymers from quantum mechanical computations

    Författare :Amina Mirsakiyeva; Anna Delin; Igor Zozoulenko; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; density functional theory; DFT; Car-Parrinello molecular dynamics; CPMD; tigh-binding; poly 3; 4-ethylenedioxythiophene ; PEDOT; selenium; PEDOS; tellurium; PEDOTe; poly p-phenylene ; poly para-phenylene ; poly 1; 4-phenylene ; naphthobischalcogenadiazoles; Fysik; Physics;

    Sammanfattning :     Conductive polymers are also known as "organic metals" due to their semiconducting properties. They are found in a wide range of applications in the field of organic electronics. However, the growing number of experimental works is not widely supported with theoretical calculations. LÄS MER

  4. 3. Conducting Redox Polymers for Electrical Energy Storage : Backbone - Substituent Interactions in Quinone Polypyrrole Model Systems

    Författare :Christoffer Karlsson; Martin Sjödin; Petr Novák; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Organic energy storage; Hydroquinone polymers; Functionalized polypyrrole; Spectroelectrochemistry; Electrochemical quartz crystal microbalance; In situ conductivity;

    Sammanfattning : Organic electrical energy storage (EES) is a growing field of research that is expected to play an important role in the future, as the need for sustainable EES increases. Conducting redox polymers (CRPs), i.e. conducting polymers with incorporated redox active moieties e. LÄS MER

  5. 4. Chemical and electronic structure of interfaces in organic-based devices

    Författare :Annica Crispin; Henrik Stubb; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : This thesis deals with some of the main physical and chemical phenomena involving organic semiconductors in (opto )electronic devices: (i) the fabrication and characteristics of organic light emitting diodes (OLEDs), (ii) the chemistry occurring at metal-polymer and polymer-metal interfaces, (iii) the nature of electronic levels induced upon doping in molecular organic semiconductors.In the first paper, fluorine tin oxide (FTO) electrodes have been studied as an alternative to indium tin oxide (ITO) for hole-injection in polymer-based light emitting devices. LÄS MER

  7. 5. Theoretical studies of lattice- and spin-polarons

    Författare :Nina Bondarenko; Olle Eriksson; Natalia Skorodumova; Manuel Pereiro; Maria Roser Valenti Vall; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Polaron; Nonlinear Schrödinger Equation; Nonlocality; Solitons; Integrable systems; Quantum field theory low energy ; Electron-phonon interaction; Density functional theory; Electronic structure of atoms and molecules; Spin-polaron; Langevin equation; Transport properties; Hubbard model; Heisenberg lattice; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : Theoretical studies of lattice- and spin-polarons are presented in this thesis, where the primary tool is ab-initio electronic structure calculations. The studies are performed with employment of a variety of analytical and computational methods. LÄS MER