Sökning: "Dye-sensitized"

Visar resultat 1 - 5 av 82 avhandlingar innehållade ordet Dye-sensitized.

  1. 1. Interactions in Dye-sensitized Solar Cells

    Författare :Helena Greijer Agrell; Anders Hagfeldt; Gerrit Boschloo; Laurence Peter; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; solar cells; photovoltaics; dye-sensitized; mesoporous; nanostructured; Raman scattering; Fysikalisk kemi; Physical chemistry; Fysikalisk kemi;

    Sammanfattning : The interactions between the molecular constituents in dye-sensitized solar cells were studied with UV-VIS and IR spectroscopy, Raman scattering, conductivity and electron accumulation measurements.From stability studies of the dye, bis(tetrabutylammonium)cis-bis(thiocyanato) bis(2,2’-bipyridine-4-carboxylic acid, 4’-carboxylate) ruthenium(II), in the complete solar cell, the thiocyanate ion ligand was found to be lost from the dye. LÄS MER

  3. 2. Characterization of dye-sensitized solar cells : Components for environmentally friendly photovoltaics

    Författare :Hanna Ellis; Anders Hagfeldt; Gerrit Boschloo; Erik Johansson; Maria Hahlin; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; solar cells; dye-sensitized solar cells; Chemistry with specialization in Physical Chemistry; Kemi med inriktning mot fysikalisk kemi;

    Sammanfattning : As fossil fuels, the major source of energy used today, create the greenhouse gas carbon dioxide which causes global warming, alternative energy sources are necessary in the future. There is a need for different types of renewable energy sources such as hydropower, windpower, wave- power and photovoltaics since different parts of the world have different possibilities. LÄS MER

  4. 3. Exploring Dye-Sensitized Mesoporous NiO Photocathodes : from Mechanism to Applications

    Författare :Lei Tian; Haining Tian; Leif Hammarström; Fabrice Odobel; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NiO; p-type; dye-sensitized solar cells; solid state; charge separation; charge recombination; charge diffusion; transport time; surface states; electron conductor; dye regeneration; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

    Sammanfattning : Increasing attention has been paid on solar energy conversion since the abundant solar energy possesses the potential to solve the problems on energy crisis and climate change. Dye-sensitized mesoporous NiO film was developed as one of the attractive photocathodes to fabricate p-type dye-sensitized solar cells (p-DSCs) and dye-sensitized photoelectrosynthetic cells (p-DSPECs) for electricity and chemical fuels generation, respectively. LÄS MER

  5. 4. Photoelectrochemical studies of dye-sensitized solar cells using organic dyes

    Författare :Tannia Marinado; Anders Hagfeldt; Katoh Ryuzi; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; additive; charge recombination; coadsorbent; conduction band shift; dye-sensitized; electron lifetime; electron-transfer; organic dye; photoelectrochemical; photovoltaic; sensitizer; semiconductor; solar cell; solar cell efficiency; titanium dioxide; Physical chemistry; Fysikalisk kemi;

    Sammanfattning : The dye-sensitized solar cell (DSC) is a promising efficient low-cost molecular photovoltaic device. One of the key components in DSCs is the dye, as it is responsible for the capture of sunlight. State-of-the-art DSC devices, based on ruthenium dyes, show record efficiencies of 10-12 %. LÄS MER

  7. 5. 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