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Alkyl chain-functionalized hole-transporting domains in zinc(II) dye-sensitized solar cells

Hostettler, Nik and Fürer, Sebastiab and Bozic-Weber, Biljana and Constable, Edwin C. and Housecroft, Catherine E.. (2015) Alkyl chain-functionalized hole-transporting domains in zinc(II) dye-sensitized solar cells. Dyes and Pigments, 116 . pp. 124-130.

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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.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Constable)
05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Housecroft)
UniBasel Contributors:Housecroft, Catherine Elizabeth and Constable, Edwin Charles and Bozic Weber, Biljana and Hostettler, Niklaus and Fürer, Sebastian
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Elsevier
ISSN:0143-7208
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:11 Oct 2017 12:36
Deposited On:10 Apr 2015 09:12

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