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Soluble thiophene-based copolymers, poly[(3-alkylthiophene)-co-(3-thiophene acetic acid)]s (P3AT-co-3TAA-n's), were synthesized to apply to the polymer sensitizer of the polymer-sensitized solar cell devices. In order to improve the solubility and the chemical adsorption onto nanoporous TiO2 layers in the polymer-sensitized solar cell devices, thiophene-based copolymers having the chemical structures of the carboxyl group and the alkyl group were designed. We have fabricated solid-state polymer-sensitized solar cell devices using polymer sensitizers and polymer electrolytes, and investigated on the photovoltaic performances. In the polymer-sensitized solar cell devices using polymer sensitizers, Voc is 0.37-0.46 V, Jsc is 0.82-7.71 mA/cm2, and the power conversion efficiency is 0.14-0.38%, respectively. [ABSTRACT FROM AUTHOR]

Three novel alternating copolymers containing 9,9-dioctylfluorene and thiophene derivatives, poly[(9,9-dioctylfluorene-2,7-diyl)-alt-(4,4'-bis(3''-hexyl-2''thienyl)-biphenyl-5”,5''-diyl)] (P1), poly[(9,9-dioctylfluorene-2,7-diyl)-alt-(5,5'-bis(3''-hexyl-2”thienyl)-2,2'-bithiophenyl-5”,5''-diyl)] (P2), and poly[(9,9-dioctylfluorene-2,7-diyl)-alt-(5,5'-bis(3''-hexyl-2''thienyl)-2,2'-biselenophenyl-5”,5''-diyl)] (P3) were synthesized by a palladium-catalyzed Suzuki polymerization. The synthesis, thermal stability, as well as the optical and electrochemical properties of these polymers are systematically investigated. The polymers were thermally stable up to 400°C, and readily soluble in common organic solvent. The absorption and emission maxima of the copolymers varied according to the type of incorporated aromatic group (thiophene, selenophene, or phenylene). [ABSTRACT FROM AUTHOR]

A new class of high brightness and luminance efficiency of poly[2-{4-[5-(3-(3,7-dimethyloctyloxy)phenyl)-1,3,4-oxadiazole-2-yl]phenyl}-1,4-phenylenevinylene] (C10PhOxa-PPV) was synthesized by Gilch polymerization. The weight average molecular weight (Mw) and the polydispersity of C10PhOxa-PPV were found to be 2.7 × 104 and 2.6, respectively. Double-layer light-emitting device with an ITO/PEDOT/C10PhOxa-PPV/Al was fabricated and characterized. The maximum brightness, and luminance efficiency of C10PhOxa-PPV showed values of up to 8.3 cd/A and 4,426 cd/m2, respectively. [ABSTRACT FROM AUTHOR]