Influence of oxygen and water related surface defects on the dye sensitized TiO2 solar cell
| Autor: | Elizaveta A. Konstantinova, Iver Lauermann, I. Uhlendorf, F. Koch, Thomas Dittrich, J. Weidmann |
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| Rok vydání: | 1999 |
| Předmět: |
Renewable Energy
Sustainability and the Environment business.industry Open-circuit voltage Photoconductivity technology industry and agriculture chemistry.chemical_element Electrolyte Oxygen Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Dye-sensitized solar cell Optics chemistry Chemical engineering law Chemisorption Solar cell business Short circuit |
| Zdroj: | Solar Energy Materials and Solar Cells. 56:153-165 |
| ISSN: | 0927-0248 |
| DOI: | 10.1016/s0927-0248(98)00153-6 |
| Popis: | Oxygen- and water-related surface defects on porous TiO 2 (anatase) can be well controlled by the oxygen and water partial pressures and therefore such defects are of technological relevance for dye sensitized TiO 2 solar cells. We investigated the action of oxygen and water-related surface defects in situ by impedance spectroscopy, photoconductivity, photoluminescence, and optical transmission as well as by characterizing solar cells which were prepared under respective conditions. Oxygen loss from the TiO 2 surface leads to electrical doping by Ti3‘/oxygen donor states. Such defects create recombination paths for injected electrons back into the electrolyte. Pre-treatment of porous TiO 2 by chemisorption of water increases the open circuit voltage of the solar cells without altering the short circuit current. Water-related surface defects decrease the saturation current of the diode, probably by raising the barrier height at the TiO 2 /electrolyte interface. ( 1999 Elsevier Science B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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