Add time:08/18/2019         Source:sciencedirect.com

Two novel 4,4′-bis(alkylphenyl/alkyloxyphenyl)-2,2′-bithiophene bridged cyclic thiourea functionalized triphenylamine sensitizers (D8 and D9), comprising 2-cyanoacrylic acid as the acceptor, have been designed and synthesized for dye-sensitized solar cells (DSSCs). For comparison, an analogue (D7) with 4,4′-dihexyl-2,2′-bithiophene spacer was synthesized as well. Their photophysical, electrochemical and photovoltaic properties have been systematically investigated. Compared with D7, D8 and D9 exhibit red-shifted and expanded absorption bands because aromatic alkylphenyl/alkyloxyphenyl was incorporated into the π-conjugated system, which resulted in an increased short-circuit photocurrent density (Jsc). In addition, the relatively bulky alkylphenyl/alkyloxyphenyl suppresses intermolecular π–π aggregation and undesired charge recombination more effectively than alkyl chains, thus enhanced open-circuit voltages (Voc) were obtained for D8 and D9. Due to the higher Jsc together with the enhanced Voc, D8 and D9 sensitized DSSC devices demonstrate improved power conversion efficiencies (PCEs) up to 7.88% under AM 1.5G irradiation, which surpassed that of D7 (7.41%).

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