Abstract
A well defined diblock copolymer (P3HT-b-C60) based on regioregular poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acidmethyl ester (PCBM) was synthesized via two controlled polymerization steps and used asa compatibilizer for the P3HT/PCBM blend, which has widely been used as an active layerin bulk heterojunction polymer solar cells. The addition of a small amount of P3HT-b-C60 results in not only the reduction of phase size of P3HT/PCBM blend but also thesuppression of macrophase separation for long-time thermal annealing owing to thepreferential location of the diblock copolymers at the interface between P3HT and PCBMphases. The morphology change with the annealing time is closely related to the change ofthe power conversion efficiency (PCE) of solar cells: the PCE of P3HT/PCBMgreatly decreases with increasing annealing time while the addition of P3HT-b-C60 significantly reduces the decrease of PCE for long-time thermal annealing.
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