Influence of electrolytes on the photovoltaic performance of organic dye-sensitized nanocrystalline TiO2 solar cells

Citation
K. Hara et al., Influence of electrolytes on the photovoltaic performance of organic dye-sensitized nanocrystalline TiO2 solar cells, SOL EN MAT, 70(2), 2001, pp. 151-161
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
SOLAR ENERGY MATERIALS AND SOLAR CELLS
ISSN journal
0927-0248 → ACNP
Volume
70
Issue
2
Year of publication
2001
Pages
151 - 161
Database
ISI
SICI code
0927-0248(200112)70:2<151:IOEOTP>2.0.ZU;2-V
Abstract
We have studied the influence of electrolytes on the photovoltaic performan ce of mercurochrome-sensitized nanocrystalline TiO2 solar cells using LiI, LiBr, and tetraalkylammonium iodides as the electrolyte. Short-circuit phot ocurrent density (J(sc)) and open-circuit photovoltage (V-oc) depended stro ngly on the electrolyte. J(sc) of 3.42 mA cm(-2) and V-ov of 0.52 V were ob tained for the LiI electrolyte and J(sc) of 2.10 mA cm(-2) and V-oc of 0.86 V were obtained for the Pr4NI electrolyte. This difference in photovoltaic performance was due to the change in the conduction band level of the TiO2 electrode. Large V-oc of 0.99V was obtained for the LiBr electrolyte due t o the large energy gap between the conduction band level of TiO2 and the Br /Br-2 redox potential. Solar cell performance also depended strongly on org anic solvent, suggesting that the physical properties of solvents such as L i ion conductivity and donor number affect photovoltaic performance. (C) 20 01 Elsevier Science B.V. All rights reserved.