Sökning: "Dssc"

Visar resultat 11 - 15 av 15 avhandlingar innehållade ordet Dssc.

1. 11. Exploring Organic Dyes for Grätzel Cells Using Time-Resolved Spectroscopy

   Författare :Ahmed M. El-Zohry; Burkhard Zietz; Ana Morandeira; Leif Hammarström; Eric Vauthey; Uppsala universitet; []
   Nyckelord :Laser spectroscopy; DSSCs; DSC; Electron dynamics; Deactivation processes; Isomerization; Twisting; TICT; Quenching by protons; Semiconductor; Electrolyte; Electron injection; Regeneration; Recombination; Chemistry with specialization in Physical Chemistry; Kemi med inriktning mot fysikalisk kemi; Kemi med inriktning mot kemisk fysik; Chemistry with specialization in Chemical Physics;

   Sammanfattning : Grätzel cells or Dye-Sensitized Solar Cells (DSSCs) are considered one of the most promising methods to convert the sun's energy into electricity due to their low cost and simple technology of production. The Grätzel cell is based on a photosensitizer adsorbed on a low band gap semiconductor. LÄS MER

3. 12. Computational Investigation of Dye-Sensitized Solar Cells

   Författare :Mattias Nilsing; Sten Lunell; Lars Ojamäe; Petter Persson; Sven Stafström; Uppsala universitet; []
   Nyckelord :Quantum chemistry; titanium dioxide; anatase; rutile; pyridine; perylene; nanostructured; interface; electronic coupling; electron injection; quantum chemistry; phosphonic acid; Kvantkemi;

   Sammanfattning : Interfaces between semiconductors and adsorbed molecules form a central area of research in surface science, occurring in many different contexts. One such application is the so-called Dye-Sensitized Solar Cell (DSSC) where the nanostructured dye-semiconductor interface is of special interest, as this is where the most important ultrafast electron transfer process takes place. LÄS MER

4. 13. Skin fibrosis, internal organ involvement and auto antibodies in systemic sclerosis: longitudinal development and impact on survival

   Författare :Roger Hesselstrand; Reumatologi och molekylär skelettbiologi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; muscle system; rheumatology locomotion; Skelett; muskelsystem; reumatologi; Skeleton; proteoglycan; pulmonary hypertension; organ involvement; auto antibodies; survival; systemic sclerosis; prognosis;

   Sammanfattning : Systemic sclerosis (SSc) is a connective tissue disease with a highly variable prognosis. Since new treatment strategies are emerging, there is a need for prognostic markers in order to help allocate patients to the optimal treatment. LÄS MER

5. 14. Light Induced Charge Generation, Recombination, and Transport in Organic Solar Cells

   Författare :Yingyot Infahsaeng; Kemisk fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Light-to-electricity conversion processes in organic and dye sensitized solar cells have attracted much scientific effort, aiming to understand the fundamental nature of these processes and to improve solar cell efficiency. Power conversion efficiency of such solar cells has progressed steadily in the last few decades, suggesting applicability for commercial products in the nearest future. LÄS MER

7. 15. Structure-dependent charge transfer at the interafce between organic thin films, and metals and metal oxides

   Författare :Sareh Ahmadi; Oscar Tjernberg; Guy Le Lay; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; photoelectric spectroscopy; X-ray absorption spectroscopy; organic semiconductors; phthalocyanine; charge transfer; electronic structure; dye sensitization;

   Sammanfattning : The purpose of the research work, presented in this thesis is to offer a detailed atomic level study of interfaces created by adsorption of organic molecules on metals and metal oxides to point out significant impact of substrate, dye structure as well as different mediators on the charge transfer at these interfaces, which is proven to influence the device performance to a great extent.Adsorption of organic photosensitive molecules on metals and metal-oxides is the main focus of this thesis. LÄS MER