Sökning: "Exciton"

Visar resultat 11 - 15 av 107 avhandlingar innehållade ordet Exciton.

  1. 11. Exciton coupling and energy transfer in perylene-based systems

    Författare :Alexei Cravcenco; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic Chemistry; Photophysics; Energy transfer; FRET; Perylene; J-aggregate;

    Sammanfattning : Understanding the nature of photoinduced processes in organic molecules is essential for the design and synthesis of compounds with desired photochemical properties. This dissertation aims for gaining knowledge and mechanistic understanding of energy transfer in perylene-based systems. LÄS MER

  3. 12. Photoelectron Spectroscopy Studies of III-V Semiconductor Systems

    Författare :Henric Åsklund; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; low temperature MBE; GaAs 111 A; InAs; core-level; GaMnAs; photoelectron spectroscopy; MEE; GaAs; InP 110 :As; valence-band; core-exciton; diluted magnetic semiconductor; MBE; interface; III-V semiconductor; surface; InAs 111 A; thin films;

    Sammanfattning : Photoelectron spectroscopy has been used as a main tool to study a number of III-V semiconductor surfaces. This thesis includes studies of a surface reaction, As/InP(110), thin heteroepitaxial layers, InAs on GaAs(111)A and GaAs on AlAs(100), and a diluted magnetic semiconductor, Ga1-xMnxAs. LÄS MER

  4. 13. Coherent Plasmon-Plasmon and Plasmon-Exciton Interactions at the Nanoscale

    Författare :Martin Wersäll; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; directional emission; coherent interactions; strong coupling; localized surface plasmon resonances;

    Sammanfattning : Noble metallic nanoparticles which supports localized surface plasmon resonances, offers a variety of potential scientific as well as industrial applications. Due to a remarkable ability to confine light at nanoscale dimensions, far below the optical diffraction limit, together with an ability to detect minute changes in the local environment plasmonic nanoparticles have paved routes towards several new and intriguing techniques, promising for future applications in areas such as molecular sensing and quantum optics. LÄS MER

  5. 14. A Tale of Chaos and Colour Influencing the photophysical properties and glass forming abilities of BODIPY dyes via structural modification

    Författare :Clara Schäfer; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; BODIPYs; structure-to-optical properties relationship; entropy; amorphous materials; exciton coupling;

    Sammanfattning : Organic dyes are everyday contributors in chemistry, physics and biology. BODIPY dyes were used as model dye class in this thesis. They are well-known for their versatility, which mainly originates from the tuneability of their photophysical properties upon changes in their molecular structure. LÄS MER

  7. 15. Ultrafast Photoinduced Processes in Core and Core–Shell Quantum Dots for Solar Cell Applications “Tiny Crystals for Big Applications”

    Författare :Mohamed Qenawy; Kemisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quantum dots; core–shell; electron injection; hole injection; hole trapping; exciton migration; solar cells; ultrafast dynamics; time-resolved spectroscopy.;

    Sammanfattning : The balance between our demands of energy and the energy we are consuming is not in equilibrium anymore. Therefore, the search for other energy resources is indispensable. Sustainable energy sources offer the alternative to the fossil fuels. LÄS MER