Abstract
Two polythiophene derivatives containing phenothiazine units, PTZV-PT and POPTZ-PT, were synthesized by a Stille coupling reaction and characterized by UV−vis absorption spectroscopy, photoluminescence spectroscopy, and electrochemical cyclic voltammetry. The structural difference between the two polymers lies in the locations of the phenothiazine units relative to thiophene-containing polymer backbones. The phenothiazine unit acts as side chain for PTZV-PT, whereas it copolymerizes with thiophene in the polymer main chain for POPTZ-PT. Compared to POPTZ-PT, PTZV-PT exhibits a broader absorption band with an absorption edge close to 700 nm. Mobility measurements by the space-charge-limited current (SCLC) method showed that PTZV-PT exhibits a higher hole mobility (4.7 × 10−3 cm2 V−1 s−1) than POPTZ-PT (5.0 × 10−4 cm2 V−1 s−1). The polymers were used to fabricate bulk-heterojunction polymer solar cells (PSCs). The PSCs with active layers consisting of these two polymers as electron donors and the methanoful...
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