Sökning: "charge relaxation"

Visar resultat 1 - 5 av 84 avhandlingar innehållade orden charge relaxation.

  1. 1. Energy migration and charge formation in conjugated polymers

    Författare :Yuri Zaushitsyn; Kemisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic resonance; relaxation; spectroscopy; Kondenserade materiens egenskaper:elektronstruktur; egenskaper elektriska; magnetiska och optiska ; supraledare; magnetisk resonans; spektroskopi; supraconductors; magnetic and optical properties; electrical; energy transfer; Physics; Fysik; Condensed matter:electronic structure; transient absorption spectroscopy; conjugated polymer; charge photogeneration;

    Sammanfattning : The main part of the thesis is concerned with charge photogeneration in conjugated polymers. MeLPPP and POMeOPT films were investigated by transient absorption spectroscopy using different excitation photon energies and light intensities with and without an external electric field. LÄS MER

  3. 2. Electrical Charges on Polymeric Insulator Surfaces and their Impact on Withstand Performance

    Författare :Sarath Kumara; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; impulse corona; Surface charge; impulse flashover voltage; corona charging; streamer criterion; surface potential decay; charge relaxation;

    Sammanfattning : Use of polymeric materials for high voltage outdoor insulation systems is increasing continuously. Insulating polymers gradually replace traditional materials like porcelain and glass and become dominant at ultra high voltages, e.g., in 1000 kV ac and 800 kV dc overhead power transmissions, which are presently being developed. LÄS MER

  4. 3. Time-dependent relaxation of charge and energy in electronic nanosystems

    Författare :Jens Schulenborg; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; heat current; quantum dot; relaxation rate; rate detection; generalization of hermiticity; nonunitary dynamics; open quantum system; Coulomb charging energy; voltage switch; transient response; electronic nanosystem;

    Sammanfattning : The study of the dynamics of strongly confined, interacting open quantum systems has attracted great interest over the past years, due to potential applications in nanoelectronics, metrology as well as quantum information. Most recent experimental and theoretical research in this field has shifted attention towards electronic heat currents, recognizing their potential for practical purposes as well as for tests of fundamental theories, and also aiming to control the inevitable heat dissipation of any dynamically operated electronic device. LÄS MER

  5. 4. Chiral Ruthenium Dipyrodiphenazine Complexes: DNA Binding and Excited State Relaxation

    Författare :Björn Önfelt; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; polarization spectroscopy; DNA-probe; dppz; excited-state relaxation; intercalation; solvent relaxation; DNA-threading;

    Sammanfattning : Ruthenium complexes with aromatic ligands have been extensively studied due to their interesting photophysical properties, including photophysics and electron transfer upon interaction with nucleic acids. For example, the broad absorption spectrum makes them suitable as antenna molecules in photochemical reaction systems and their ability to accept or donate electrons in their excited state could have potential in opto-electronical devices. LÄS MER

  7. 5. Theoretical Modeling of Intra- and Inter-molecular Charge Transport

    Författare :Lili Lin; Yi Luo; Alessandro Troisi; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; charge transport; molecular junction; organic molecular materials; Green s function; first-principles simulation; SRA - Transport; SRA - Transport;

    Sammanfattning : This thesis focuses on theoretical study of charge transportproperties in molecular systems. The understanding of the transportprocess and mechanism in molecular systems is essential forthe design of new functional molecular materials and molecularelectronic devices. LÄS MER