Alkyl chain-functionalized hole-transporting domains in zinc(II) dye-sensitized solar cells
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 2953396
Author(s) Hostettler, Nik; Fürer, Sebastiab; Bozic-Weber, Biljana; Constable, Edwin C.; Housecroft, Catherine E.
Author(s) at UniBasel Housecroft, Catherine
Constable, Edwin Charles
Bozic Weber, Biljana
Hostettler, Niklaus
Fürer, Sebastian
Year 2015
Title Alkyl chain-functionalized hole-transporting domains in zinc(II) dye-sensitized solar cells
Journal Dyes and Pigments
Volume 116
Pages / Article-Number 124-130
Keywords Zinc, Sensitizer, DSSC, Surface-functionalization, 'Surfaces-as-ligands', 2,2 ':6 ',2 ''-terpyridine
Abstract FTO/TiO2 electrodes have been functionalized with {Zn(tpyanchor)(tpyancillary)}2+ dyes (tpy = 2,2′:6′,2″-terpyridine) using a stepwise method to sequentially introduce (i) the anchoring ligand tpyanchor (either a dicarboxylic acid or a diphosphonic acid), (ii) Zn2+ ions, and (iii) chromophoric ancillary (4-([2,2′:6′,2″-terpyridin]-4′-yl)-N,N-bis(4-alkoxyphenyl)aniline ligands. A comparison of unmasked and fully masked DSSCs containing representative dyes shows a significant drop in photon-to-current efficiency upon masking. Solid-state absorption spectra of the dye-functionalized electrodes confirm that the intensity of absorption decreases with the steric demands of the ancillary ligand. DSSC measurements show that the {Zn(tpyanchor)(tpyancillary)}2+ dyes give poor photon-to-current efficiencies, values of the short circuit current density (JSC) and the external quantum efficiency (EQE) spectra are consistent with very poor electron injection. Introducing longer alkoxy chains in place of methoxy substituents in the hole-transporting domains in tpyancillary is beneficial, resulting in increased JSC and VOC, although values remain low despite the 'push–pull' design of the sensitizers.
Publisher Elsevier
ISSN/ISBN 0143-7208
edoc-URL http://edoc.unibas.ch/dok/A6348560
Full Text on edoc Available
Digital Object Identifier DOI 10.1016/j.dyepig.2015.01.008
ISI-Number 000350936400017
Document type (ISI) Article
 
   

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