Zinc–Porphyrin Dyes with Different meso‐Aryl Substituents for Dye‐Sensitized Solar Cells: Experimental and Theoretical Studies

Abstract

A series of new zinc-porphyrin dyes that contain different meso substituents (phenyl, carbazole phenyl, and carbazole thiophenyl groups) and bithiophenyl cyanoacrylic acid as the π-conjugated anchoring moiety were designed, synthesized, and characterized as sensitizers for dye-sensitized solar cells (DSSCs). The effects of these meso substituents on the properties of the porphyrin dyes were theoretically and experimentally investigated. By meso substitution of the porphyrin ring with carbazole-aryl moieties, the short-circuit current (Jsc ) and open-circuit voltage (Voc ) of the DSSCs were improved as was the power conversion efficiency (η) owing to the influence of both the suppression of dye aggregations and the enhanced charge separation and charge-injection efficiency of the dye to TiO2 films. Among these dyes, ZnPCPA made of the carbazole phenyl meso substituents gave rise to the highest η of 6.24 % (Jsc =13.38 mA cm(-2) , Voc =0.66 V, and fill factor of 0.71).

The influence of noncovalent interactions in metal‐free organic dye molecules to augment the efficiency of dye sensitized solar cells: A computational study

“…The calculated results revealed that phosphazene containing dyes 2 , 4 , 6 , 8 , and 10 have larger μ normal and n c values than corresponding dyes 1 , 3 , 5 , 7 , and 9 (Table ). We have also extended our study with dye−(TiO 2 ) 38 cluster model which has been demonstrated reliable simulation of the dye–TiO 2 surface . In this case we have also observed that the dye 2 −(TiO 2 ) 38 system has larger μ normal value than the dye 1 −(TiO 2 ) 38 (Figure ).…”

Novel improvements in the sensitizers of dye-sensitized solar cells for enhancement in efficiency-a review

“…The obtained efficiency was about 6.24%; the improved efficiency is due to the suppression in the aggregation of dye molecules and enhanced charge separation and charge injection [56]. The best result was obtained for dyes modified by carbazole phenyl group at the meso position.…”

“…The best result was obtained for dyes modified by carbazole phenyl group at the meso position. The obtained efficiency was about 6.24%; the improved efficiency is due to the suppression in the aggregation of dye molecules and enhanced charge separation and charge injection [56].…”

Efficient co-sensitization of dye-sensitized solar cells by novel porphyrin/triazine dye and tertiary aryl-amine organic dye

“…This is ascribed to the anchoring of the dye through its carboxylic acid groups to TiO 2 , a phenomenon that is commonly observed in the spectral responses organic sensitizers with carboxylic acid groups adsorbed onto TiO 2 films [33,34]. The broadness of the UV-vis absorption spectrum of ZnP-triazine-(gly) 2 adsorbed onto TiO 2 indicates its efficient light harvesting ability, making it suitable for use as sensitizer in DSSCs.…”