Search for dissertations about: "Polyfluorene"

Showing result 1 - 5 of 13 swedish dissertations containing the word Polyfluorene.

  1. 1. Thin films of polyfluorene:fullerene blends - Morphology and its role in solar cell performance

    University dissertation from Fakulteten för teknik- och naturvetenskap

    Author : Cecilia Björström Svanström; Karlstads universitet.; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Polymer Solar Cells; Polymer Blends; Morphology; Polyfluorene; PCBM; AFM; SIMS; Spin-Coating; Surface Directed Spinodal Decomposition; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; Physics; Fysik;

    Abstract : The sun provides us daily with large quantities of energy in the form of light. With the world’s increasing demand of electrical energy the prospect of converting this solar light into electricity is highly tempting. In the strive towards mass-production and low cost solar cells, new types of solar cells are being developed, e.g. READ MORE

  2. 2. The morphology of polyfluorene fullerene blend films for photovoltaic applications

    University dissertation from Karlstad : Karlstad University

    Author : Ana Sofia Anselmo; Karlstads universitet.; [2011]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials Science; Organic Photovoltaics; Polymer Solar Cells; Materialteknik; Materials Engineering;

    Abstract : Polymer photovoltaic systems whose photoactive layer is a blend of a semiconducting polymer with a fullerene derivative in a bulk heterojunction configuration are amongst the most successful organic photovoltaic devices nowadays. The three-dimensional organization in these layers (the morphology) plays a crucial role in the performance of the devices. READ MORE

  3. 3. Optical modelling of conjugated polymers : from materials to devices

    University dissertation from Linköping : Linköpings universitet

    Author : Nils-Krister Persson; Linköpings universitet.; Linköpings universitet.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Spectroscopic ellipsomctry; optical modelling; organic solar cell; conjugated polymer; polyfluorene; polythiophene; copolymer; fullerene blend; photovoltaic device; dielectric function; NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : Measurements and modelling of theoretical properties of polymer-based photovoltaic devices, PPVDs, are the subjects of this thesis. Modelling refers both to modelling of materials, based on extraction of the dielectric function, and to modelling of devices by computer simulation of the optical electrical field inside PPVDs. READ MORE

  4. 4. Morphology studies of thin films of polyfluorene: fullerene blends

    University dissertation from Karlstad : Karlstads universitet

    Author : Cecilia Björström; Karlstads universitet.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; Physics; Fysik;

    Abstract : The formation of thin films of polymer blends by spin-coating from solution is characterised by rapid solvent quenching, a process that results in non-equilibrium morphologies. Thin films of conjugated polymer blends are used as the active material in polymer solar cells, in which the morphology may have drastic effects on device performance. READ MORE

  5. 5. Conjugated polymers for optoelectronics

    University dissertation from Karlstad : Karlstads universitet

    Author : Lars Johan Lindgren; [2008]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Polymer Light-Emitting Diodes; Conjugated polymers; Polyfluorenes; Polymer Solar Cells;

    Abstract : The work presented in thesis is divided into two parts; conjugated polymers for light-emitting diodes and conjugated polymers for solar cells. The main focus was on the synthesis and characterisation of the conjugated polymers, together with device preparation and characterisation. READ MORE