Sökning: "singlet fission"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden singlet fission.

1. 1. Singlet Fission - The Effects of Solvent Polarity and Conformation

   Författare :Rasmus Ringström; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Singlet fission; rotational conformation; photoinduced electron transfer; transient absorption;

   Sammanfattning : Singlet fission (SF) is a process in which one initial high energy singlet excited state is converted into two triplet excited states of roughly half the energy of the initial state. This process has the potential to increase the efficiency of conventional solar cells by modifying the energy of the incident solar radiation to better match the energy input required to generate electricity. LÄS MER

3. 2. Intramolecular Electronic Interactions in Photon Upconversion and Singlet Fission

   Författare :Fredrik Edhborg; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Singlet Fission; Photon Upconversion; Intramolecular; Excitation Energy Transfer; Solar Energy Conversion;

   Sammanfattning : The sun provides our planet with an abundance of energy in the form of solar light – a continuous stream of photons. Increasing our direct utilization of solar energy will constitute a necessary part in our ongoing replacement of fossil fuels with energy sources free from greenhouse gas emissions. LÄS MER

4. 3. Singlet Fission and Exciton Coupling Design Principles for Efficient Photon Harvesting

   Författare :Rasmus Ringström; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; exciton coupling; electron transfer; Singlet fission; transient absorption spectroscopy;

   Sammanfattning : Extensive research efforts have been dedicated to unravelling the diverse array of processes triggered by the interaction of light with matter. Harnessing and comprehending some of these phenomena holds immense potential in humanity's transition towards renewable energy sources. LÄS MER

5. 4. Structure-Property Relationships in Chromophore-Organogel Assemblies: Consequences for Triplet-Triplet Annihilation and Singlet Fission

   Författare :Deise Fernanda Barbosa de Mattos; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; photophysics; singlet fission; triplet-triplet annihilation upconversion; self-assembly; organogel.;

   Sammanfattning : Better utilization of the solar spectrum by absorbing photons that are currently wasted by solar cells, due to the bandgap mismatch with the semiconductor, will help to improve the device efficiency. Two low energy photons can be upconverted to one high energy photon through triplet-triplet annihilation (TTA-UC); one high energy photon can be down converted to form two charge carriers through singlet fission (SF). LÄS MER

7. 5. Circumventing Spectrum Mismatch - Studies of Triplet-Triplet Annihilation Upconversion, Singlet Fission and Two-Photon Absorption in Photoactive Materials

   Författare :Deise Fernanda Barbosa de Mattos; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; singlet fission; solar energy conversion; two-photon absorption; energy transfer; triplet-triplet annihilation upconversion; spectroscopy.; carbon nitride quantum dots; self-assembly gels; photochemistry;

   Sammanfattning : Solar energy stands out for its potential to supply the global energy demand by itself. Therefore, it is of great value to expand the use of processes that involve light such as conversion to electricity or fuels, or to drive high-energy reactions. LÄS MER