Enhanced charge carrier generation in dye sensitized solar cells by nanoparticle plasmons

2008 ◽  
Vol 92 (1) ◽  
pp. 013113 ◽  
Author(s):  
Carl Hägglund ◽  
Michael Zäch ◽  
Bengt Kasemo
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Dye Sensitized Solar Cells ◽  
Carrier Generation ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

TiO2 Surface State Control for Dye Sensitized Solar Cells with High Efficiency and the Solidification -Fabrication of Charge Carrier Path

2007 ◽  
Vol 1031 ◽  
Author(s):  
Fumi Inakazu ◽  
Yuhei Ogomi ◽  
Yusuke Noma ◽  
Yoshihisa Fujita ◽  
Mitsuru Kono ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Surface State ◽  
Dye Sensitized Solar Cells ◽  
High Electron ◽  
Nano Materials ◽  
Dye Sensitized ◽  
Self Organized ◽  
Dipping Process ◽  
Sensitized Solar Cells

AbstractImprovement of photovoltaic performance for dye sensitized solar cells (DSC) is discussed in terms of electron-path and ion-path. In order to make electron path, we focused on passivation of TiO2 surface states which are observed by thermally stimulated current (TSC). The TiO2 surface was well-passivated with dye molecules under pressurized CO2 atmosphere. It was found that DSC cells prepared by a CO2 process (Cell-CO2) had higher efficiency than those prepared by a conventional dipping process (Cell-DIP) and the higher efficiency was associated with low TiO2-surface state, high electron diffusion coefficient and long electron life time in TiO2 for the Cell-CO2. In addition, dye-staining under pressurized CO2 atmosphere had advantages over a conventional dipping process on rapid dye-uptake and less dye aggregation. In order to fabricate ion-path in solidified electrolyte, we focused on surface modification of nano-materials. Surface of nano-materials such as TiO2-nanoparticles and porous alumina films were modified with imidazolium iodide moieties consisting of long alkyl chains which render surface-molecules self-organized. Redox-species are concentrated on the self-organized molecules and make ion-path. We propose quasi-solid electrolyte system consisting of two layers having different charge carrier concentration to keep high photoconversion efficiencies even after solidification.

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