Abstract
AbstractWe synthesized the polythiophene‐based copolymers (poly(3‐thiopheneacetic acid‐co‐3‐dodecylthiophene)s [poly(3TA‐co‐3DT)s]) and homopolymer (poly(3‐dodecylthiophene) [P3DT]) as a polymer host to apply on quasi‐solid‐state electrolytes of dye‐sensitized solar cells (DSSCs). In order to improve their solubility and interface adsorption onto nanoporous TiO2 surface, the poly(3TA‐co‐3DT)s were designed with the chemical structure containing long‐alkyl group and carboxyl group, and the polythiophene‐based homopolymer (P3DT) was synthesized to compare the photovoltaic characteristics according to the presence of the carboxyl group. The quasi‐solid‐state DSSCs using P3DT, poly(3TA‐co‐3DT)‐1, and poly(3TA‐co‐3DT)‐2 have power conversion efficiencies of 2.62%, 2.97%, and 2.90% under photointensity of 100 mW/cm2 at AM1.5, respectively. In particular, the Jsc and power conversion efficiency of DSSC device using poly(3TA‐co‐3DT)‐1 increased up to 16.81 mA/cm2 and 4.45% by the addition of the ionic liquid.
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