Abstract
Two new polymers, poly(thiophene-benzothiadiazole) (PThBT) and poly(thiophene-dibenzophenazine) (PThFQ), were successfully polymerized through a Stille coupling reaction. PThBT exhibited the formation of an ordered lamellar structure with conventional edge-on π-stacking. In contrast, the PThFQ backbones were oriented face-on relative to the substrate. For solar cells using a 1:6 ratio of PThFQ to PC71BM, the resulting Voc, Jsc, FF and PCE were 0.73V, 3.4mA/cm2, 30.5% and 0.76%, respectively. The value of the FF for PThFQ increased by 22% compared to PThBT due to the effects of the backbone planarity of the polymers and the face-on orientation.
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