Sökning: "dye"

Visar resultat 16 - 20 av 309 avhandlingar innehållade ordet dye.

  1. 16. Studies of Charge Transport Processes in Dye-sensitized Solar Cells

    Författare :Kristofer Fredin; Anders Hagfeldt; Mukundan Thelakkat; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; solar cell; mesoporous; dye-sensitized; model; simulation; electron transport; trap distribution; Physical chemistry; Fysikalisk kemi;

    Sammanfattning : Dye-sensitized solar cells (DSCs) have attained considerable attention during the last decade because of the potential of becoming a low cost alternative to silicon based solar cells. Although efficiencies exceeding 10% in full sunlight have been presented, major improvements of the system are however limited. LÄS MER

  3. 17. Liquid Redox Electrolytes for Dye-Sensitized Solar Cells

    Författare :Ze Yu; Lars Kloo; Md K Nazeeruddin; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dye-sensitized solar cells; electrolytes; ionic liquids; redox couples; additives;

    Sammanfattning : This thesis focuses on liquid redox electrolytes in dye-sensitized solar cells (DSCs). A liquid redox electrolyte, as one of the key constituents in DSCs, typically consists of a redox mediator, additives and a solvent. LÄS MER

  4. 18. Dye-sensitized nanostructured metal oxide electrodes : Photoelectrochemical, quantum chemical and electron spectroscopic studies

    Författare :Håkan Rensmo; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Physics; Fysik; Physical Chemistry; fysikalisk kemi; NATURAL SCIENCES;

    Sammanfattning : Solar cells based on dye-Sensitized nanostructured electrodes are promising for solar energy conversion. High overall light-to-energy conversion efficiencies have been obtained for systems based on TiO2 (7%) and ZnO (2%). The photocurrent losses in these electrodes have been investigated by photoelectrochemical methods. LÄS MER

  5. 19. Towards Mixed Molecular Layers for Dye-Sensitized Solar Cells : A Photoelectron Spectroscopy Study

    Författare :Johan Oscarsson; Håkan Rensmo; Erik Johansson; Anders Hagfeldt; Gunnar Öhrwall; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dye-sensitized solar cell; DSC; mesoscopic solar cell; photoelectron spectroscopy; PES; XPS; interface; TiO2; NiO; co-adsorption; co-adsorbent; collaborative sensitization; mixed molecular layers; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : The increasing demand for renewable energy has led to substantial research on different solar cell technologies. The dye-sensitized solar cell (DSC) is a technology utilizing dye molecules for light absorption. LÄS MER

  7. 20. Ab initio simulations of core level spectra : Towards an atomistic understanding of the dye-sensitized solar cell

    Författare :Ida Josefsson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; multiconfigurational quantum chemistry; CASSCF calculations; core-level spectroscopy; x-ray photoelectron spectroscopy; x-ray absorption; resonant x-ray scattering; dye solar cells; transition metals; kemisk fysik; Chemical Physics;

    Sammanfattning : The main focus of this thesis is ab initio modeling of core level spectra with a high-level quantum chemical description both of the chemical interactions and of local atomic multiplet effects. In particular, the combination of calculations and synchrotron-based core-level spectroscopy aims at understanding the local structure of the electronic valence in transition metal complexes, and the details of the solvation mechanisms of electrolyte solutions, systems relevant for the dye-sensitized solar cell. LÄS MER