Title: Quasi-Solid Dye Sensitized Solar Cell with Straight Ion Paths
Abstract: Quasi-solid dye sensitized solar cells (QDSC) with straight ion paths are reported. The cell consists of anodic oxidation films. Ionic liquid-type electrolyte is filled in the straight nanopores and they are sandwiched between a counter electrode and a electrode. Even when electrochemically inactive wall occupies 50% of the electrolyte layer, the diffusion coefficient and solar cell performance are the same as those without the layers. This contrasts the results of cells filled with the mixture of nanoparticles and ionic liquid type electrolytes, where random ion paths are expected. In addition, when the inner wall of anodic oxidation films is chemically modified with long alkyl groups bearing methylimidazolium moieties, the increase in photovoltaic performance is observed. This is explained by the existence of ion paths along aligned methylimidazolium moieties in the surface-modified films, where species are concentrated. The swift apparent diffusion coefficient is explained by Grötthuss mechanism. Because the species are concentrated in the straight pore of layers, the concentration of species in layers is reduced relatively. This increases light penetration depth at around in the porous layer and improves incident photon-to-current efficiency at around . The hybrid electrolyte systems containing both of concentrated in a porous layer and low concentration portions in nanopores in are proposed to increase ionic liquid-type QDSC.
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 38
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