Surface Conditioning of the TiO2 Electrode in Dye-Sensitized Solar Cells
| Autor: | Knaut, M., Albert, M., Bartha, J.W., Dirnstorfer, I., Mähne, H., Jakschik, S., Mikolajick, T., Schlott, F., Dubnack, K., Kreisel, G. |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| DOI: | 10.4229/26theupvsec2011-1dv.3.32 |
| Popis: | 26th European Photovoltaic Solar Energy Conference and Exhibition; 576-579 Porous TiO2 electrodes for dye-sensitized solar cells were coated with approximately 20 nm TiO2 using Atomic Layer Deposition (ALD). Raman spectroscopy and Scanning Electron Microscopy (SEM) measurements show that ALD-conditioned surfaces are superior in terms of homogeneity and crystalline structure. The main advantage of the ALD process is the growth of predominantly anatase TiO2, which enables higher solar cell efficiencies compared to rutile TiO2. To further improve the crystalline parameters of the top ALD-TiO2 layer an intermediate ultra-thin Al2O3 buffer layer (~ 0.5 nm) was introduced. Raman measurements on planar substrates prove that the buffer layer efficiently decouples the TiO2 growth from the properties of the underneath TiO2 layer. Solar cells based on ALD-conditioned electrodes were characterized photo-electrically. The Incident Photon-to-current Conversion Efficiency (IPCE) values improved about 5 and 10 times after TiO2 deposition without and with buffer layer, respectively. |
| Databáze: | OpenAIRE |
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