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

• Stepwise assembly of anchored dyes in n-type DSSCs.
• 'Surfaces-as-ligands' dye assembly.
• Application of {Zn(tpyanchor)(tpyancillary)}2+ dyes (tpy = 2,2′:6′,2″-terpyridine) in DSSCs.
• Enhancing DSSC performance using alkoxy chains in hole-transporting domains in sensitizers.

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.

A 'surfaces-as-ligands' approach has been used to assemble {Zn(tpyanchor)(tpyancillary)}2+ dyes (tpy = 2,2′:6′,2″-terpyridine) incorporating chromophoric ancillary (4-([2,2′:6′,2″-terpyridin]-4′-yl)-N,N-bis(4-alkoxyphenyl)aniline ligands. Poor photon-to-current efficiencies are caused by low values of JSC, and EQE spectra are consistent with poor electron injection. Introducing longer alkoxy chains in the hole-transporting domains in the dyes leads to increased JSC and VOC, although absolute values remain low.Figure optionsDownload as PowerPoint slide