3 years ago

Investigation of new carbazole based metal-free dyes as active photo-sensitizers/co-sensitizers for DSSCs

Investigation of new carbazole based metal-free dyes as active photo-sensitizers/co-sensitizers for DSSCs
Herein, we report the molecular design, synthesis and characterization of three new D-D-π-A configured metal-free chromophores D 1-3 for their application in DSSCs as sensitizers as well as co-sensitizers. The new entities comprise carbazole as donor scaffold, 4-methoxyphenyl group as auxiliary donor and three different units, viz. cyanoacetic acid, 2, 4-thiazolidinedione and barbituric acid as acceptor/anchoring groups. Their photochemical, electrochemical and theoretical studies were carried out in order to assess their feasibility as active sensitizers. Further, D 1-3 were exploited as co-sensitizers along with NCSU-10 dye. Their photoelectrochemical performances and charge transport properties in fabricated DSSCs were studied. The results revealed that D 1 sensitizer displayed the highest PCE of 2.20% among the three dyes. D 3 when co-sensitized with NCSU-10 displayed an improved PCE of 8.32% (J SC  = 19.25 mA.cm−2, V OC  = 0.680 V, FF = 63.7%) while NCSU-10 alone exhibited PCE of 8.25% (J SC  = 20.41 mA.cm−2, V OC  = 0.667 V, FF = 60.6%).

Publisher URL: www.sciencedirect.com/science

DOI: S0143720817319113

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