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Sourcing large quantities of materials required for the optimization of large area devices is costly and often impossible to achieve. Continuous-flow synthesis enables straight-forward scale-up of materials compared to conventional batch reactions. In this study, poly(3-hexylthiophene), P3HT, was synthesized in a bench-top continuous-flow reactor. Precise control of the molecular weight was demonstrated for the first time in flow for conjugated polymers by accurate addition of catalyst to the monomer solution. The P3HT samples synthesized in flow showed comparable performance to commercial P3HT samples in bulk heterojunction solar cell devices. ER - TY - JOUR AU - Brabec, C. J. AU - Gowrisanker, S. AU - Halls, J. J. M. AU - Laird, D. AU - Jia, S. J. AU - Williams, S. P. JF - Adv. Mater. PY - 2010/// VL - 22 SP - 3839 DO - 10.1002/adma.200903697 ER - TY - JOUR AU - McCullough, R. D. AU - Lowe, R. D. AU - Jayaraman, M. AU - Anderson, D. L. JF - J. Org. Chem. 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