Sökning: "Maria Hahlin"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Maria Hahlin.

  1. 1. Electronic and Molecular Surface Structures of Dye-Sensitized TiO2 Interfaces

    Författare :Maria Hahlin; Håkan Rensmo; Hans Siegbahn; Anders Sandell; Mats Göthelid; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Photoelectron spectroscopy; Electron spectroscopy; Solar Cells; Dye; TiO2; Surface; Interface; Electronic structure; Molecular surface structure; coadsorbent; Physics; Fysik; Fysik; Physics;

    Sammanfattning : The dye-sensitized solar cell is a promising solar cell technology. In these systems the key process for light to electricity conversion is molecular in nature and is initiated in dye molecules adsorbed at a semiconducting surface. LÄS MER

  3. 2. Ionization Influence on the Dynamics of Simple Organic Molecules

    Författare :Tomoko Akiyama; Carl Caleman; Oscar Grånäs; Olle Björneholm; Maria Hahlin; Uppsala universitet; []
    Nyckelord :Small organic molecule; Density functional theory; bond integrity; Symmetric structure;

    Sammanfattning : This licentiate thesis is devoted to the investigation of how bonding in simple organic molecules are affected by X-ray beam irradiation. The investigation targets molecules with three carbons as their main-chain structure. The stability of the bonds under ionization are simulated using the SIESTA package. LÄS MER

  4. 3. 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 :NATURAL SCIENCES; NATURVETENSKAP; 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

  5. 4. Combining Electrochemistry and Photoelectron Spectroscopy for the Study of Li-ion Batteries

    Författare :Ida Källquist; Maria Hahlin; Håkan Rensmo; Laurent Duda; Kristina Edström; Hendrik Bluhm; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; NATURAL SCIENCES; Li-ion battery; battery interfaces; electrochemistry; electrochemical potential; photoelectron spectroscopy; operando; ambient pressure photoelectron spectroscopy;

    Sammanfattning : In this thesis photoelectron spectroscopy (PES) is combined with electrochemistry to investigate the electrochemical processes that occur at the electrode/electrolyte interfaces in lithium-ion batteries (LIBs). LIB systems are studied by the use of both ex situ PES, where electrodes are electrochemically pre-cycled and subsequently measured by PES, and operando PES, where electrodes are cycled during PES measurements. LÄS MER

  7. 5. Interfaces in Li-ion batteries seen through photoelectron spectroscopy

    Författare :Ida Källquist; Maria Hahlin; Håkan Rensmo; Laurent Duda; Kristina Edström; Edvin Lundgren; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : To accommodate the need for greener energy solutions renewable energy sources aswell as reliable energy storage is a prerequisite. For the latter, high energy densitybatteries with long-term cycling stability are necessary. The cycling properties of abattery is to a large extent dependent on the functionality of the battery interfaces. LÄS MER