Alkyl chain-functionalized hole-transporting domains in zinc(II) dye-sensitized solar cells
| Autor: | Catherine E. Housecroft, Sebastian O. Fürer, Biljana Bozic-Weber, Nik Hostettler, Edwin C. Constable |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Steric effects Absorption spectroscopy 010405 organic chemistry Ligand Process Chemistry and Technology General Chemical Engineering chemistry.chemical_element Zinc 010402 general chemistry Photochemistry 01 natural sciences 0104 chemical sciences 3. Good health chemistry.chemical_compound Dicarboxylic acid Aniline chemistry parasitic diseases Alkoxy group Alkyl |
| Popis: | FTO/TiO 2 electrodes have been functionalized with {Zn(tpy anchor )(tpy ancillary )} 2+ dyes (tpy = 2,2′:6′,2″-terpyridine) using a stepwise method to sequentially introduce (i) the anchoring ligand tpy anchor (either a dicarboxylic acid or a diphosphonic acid), (ii) Zn 2+ 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(tpy anchor )(tpy ancillary )} 2+ dyes give poor photon-to-current efficiencies, values of the short circuit current density ( J SC ) 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 tpy ancillary is beneficial, resulting in increased J SC and V OC , although values remain low despite the 'push–pull' design of the sensitizers. |
| Databáze: | OpenAIRE |
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