Thiophene-based polymers have good prospects in the field of electronic and photoelectronic devices because of their solubility, processability, environmental stability, and excellent electrical conductivity. We synthesized new type of thiophene-based polymers to use as hole transporting materials on dye-sensitized solar cells (DSSC). The thiophene-based polymers were synthesized as random copolymers containing 3-{2-[2-(2-(4-methoxybiphenyl)ethoxy)ethoxy]ethoxy}methylthiophene (MEET) units and 3-hexylthiophene (3HT) units. The photovoltaic performance of the solid-state DSSC device was improved to 3.88% overall efficiency under AM 1.5 illumination when the thiophene-based copolymer was introduced to the electrolyte as a hole transporting material.

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