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Voltage enhancement in dye-sensitized solar cell using (001)-oriented anatase TiO2 nanosheets |
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| Authors: | Barbora Laskova Marketa Zukalova Ladislav Kavan Alison Chou Paul Liska Zhang Wei Liu Bin Pavel Kubat Elham Ghadiri Jacques E. Moser Michael Gr?tzel |
| Affiliation: | 1. J. Heyrovsky Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolej?kova 3, 18223, Prague 8, Czech Republic 2. Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 12843, Prague 2, Czech Republic 3. ARC Centre of Excellence for Functional Nanomaterials, The University of Queensland, Level 5, AIBN Building No. 75, Corner College and Cooper Roads, St Lucia, Queensland, 4072, Australia 4. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology, 1015, Lausanne, Switzerland 5. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117576, Singapore 6. Photochemical Dynamics Group, Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology, 1015, Lausanne, Switzerland |
| Abstract: | A nanocrystalline TiO2 (anatase) nanosheet exposing mainly the (001) crystal faces was tested as photoanode material in dye-sensitized solar cells. The nanosheets were prepared by hydrothermal growth in HF medium. Good-quality thin films were deposited on F-doped SnO2 support from the TiO2 suspension in ethanolic or aqueous media. The anatase (001) face adsorbs a smaller amount of the used dye sensitizer (C101) per unit area than the (101) face which was tested as a reference. The corresponding solar cell with sensitized (001)-nanosheet photoanode exhibits a larger open-circuit voltage than the reference cell with (101)-terminated anatase nanocrystals. The voltage enhancement is attributed to the negative shift of flatband potential for the (001) face. This conclusion rationalizes earlier works on similar systems, and it indicates that careful control of experimental conditions is needed to extract the effect of band energetic on the current/voltage characteristics of dye-sensitized solar cell. |
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