1, 5-Naphthyridine-based conjugated polymers as co-sensitizers for dye-sensitized solar cells. (December 2019) - Mansha, Muhammad
Graphical abstract: Highlights: Synthesis of 1, 5-naphthyridine-based conjugated polymers (P1 & P2 ) Characterization of P1 & P2 by 1 H NMR, FTIR and TGA. Incorporation of P1 & P2 as co-sentizers in DSSCs sensitized with N3 dye. Enhaced PCEs of 5.88% and 6.21% as compared to 5.58% for N3 sensitizer alone. Higher charge recombination resistances by co-sensitized devices. Abstract: 1, 5-naphthyridine-based conjugated polymers (P1 and P2 ) were synthesized and extensively characterized by 1 H NMR, thermogravimetric analysis (TGA), FT-IR. These polymers were employed as co-sensitizers in DSSCs sensitized with Ru (II) based N3 dye. In comparison to the N3 sensitized device, the P1 and P2 co-sensitized solar cells demonstrated enhanced open circuit voltage, ( VOC ) of 825 and 788 mV and better fill factor ( FF ) of 59 and 58%, respectively. The co-sensitization of P1 and P2 with N3 increased the overall efficiencies to 5.88% and 6.21%, respectively, as compared to 5.58% for N3 sensitizer alone. The fabricated device based on N3 co-sensitized with P2 displayed higher charge recombination resistances as compared to the devices based on N3 alone or N3 co-sensitized with P1 . The conjugated polymers are believed to enhance light harvesting ability and reduce the charged recombination in the co-sensitized solar cells.