Voltage enhancement in dye-sensitized solar cell using (001)-oriented anatase TiO2 nanosheets

0379715 - ÚFCH JH 2013 RIV DE eng J - Journal Article
Lásková, Barbora - Zukalová, Markéta - Kavan, Ladislav - Chou, A. - Liska, P. - Wei, Z. - Bin, L. - Kubát, Pavel - Ghadiri, E. - Moser, J. E. - Grätzel, M.
Voltage enhancement in dye-sensitized solar cell using (001)-oriented anatase TiO2 nanosheets.
Journal of Solid State Electrochemistry. Roč. 16, č. 9 (2012), s. 2993-3001. ISSN 1432-8488. E-ISSN 1433-0768
R&D Projects: GA AV ČR IAA400400804; GA AV ČR KAN200100801; GA ČR(CZ) GAP108/12/0814
Institutional research plan: CEZ:AV0Z40400503
Keywords : titanium dioxide * anatase * dye-sensitized solar cell
Subject RIV: CG - Electrochemistry
Impact factor: 2.279, year: 2012

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.
Permanent Link: http://hdl.handle.net/11104/0210605