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http://hdl.handle.net/11375/12916
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DC Field | Value | Language |
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dc.contributor.advisor | Xu, Gu | en_US |
dc.contributor.author | Ma, Yiqun | en_US |
dc.date.accessioned | 2014-06-18T17:01:12Z | - |
dc.date.available | 2014-06-18T17:01:12Z | - |
dc.date.created | 2013-04-17 | en_US |
dc.date.issued | 2013-04 | en_US |
dc.identifier.other | opendissertations/7761 | en_US |
dc.identifier.other | 8820 | en_US |
dc.identifier.other | 4039852 | en_US |
dc.identifier.uri | http://hdl.handle.net/11375/12916 | - |
dc.description.abstract | <p>The pore-size dependence of liquid diffusivity in mesopores has been a controversial topic. It is especially meaningful in dye-sensitized solar cells (DSSCs) because the triiodide ion diffusivity is closely related to the cell performance. By applying electrochemical measurements, the pore-size dependence of ion diffusivity in DSSCs was investigated based on TiO<sub>2</sub> thin films of variable pore diameters. The alternation of pore-size was achieved by the epitaxial growth of TiO<sub>2</sub> after TiCl<sub>4</sub> post-treatments. From the trend of normalized diffusivities, the respective valid regimes of pore-size dependent and independent diffusion were determined, which were separated by the transition point located at 5-7 nm. In addition, my results have showed that the DSSC fabrication processes, e.g., dye loading, TiCl<sub>4</sub> post-treatment will not lead to the transition of diffusion behaviors. Furthermore, the unexpected drop of diffusivity after one TiCl<sub>4</sub> treatment is attributed to the involvement of surface diffusion in untreated TiO<sub>2</sub> matrix.</p> | en_US |
dc.subject | mesoporous materials | en_US |
dc.subject | mass transport | en_US |
dc.subject | iodide/triiodide redox couple | en_US |
dc.subject | TiCl4 post-treatment | en_US |
dc.subject | surface diffusion | en_US |
dc.subject | Semiconductor and Optical Materials | en_US |
dc.subject | Semiconductor and Optical Materials | en_US |
dc.title | Pore-size Dependence of Ion Diffusivity in Dye-sensitized Solar Cells | en_US |
dc.type | thesis | en_US |
dc.contributor.department | Materials Science and Engineering | en_US |
dc.description.degree | Master of Applied Science (MASc) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Size | Format | |
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fulltext.pdf | 2.48 MB | Adobe PDF | View/Open |
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