LAUSR

The ability to craft the cocrystallization in conjugated polymer blends represents an important endeavor for the enhancement of charge transport. However, simple and efficient approaches to cocrystallization have yet to be realized. Herein, we report, for the first time, a robust meniscus-assisted solution-shearing (MASS) strategy to achieve cocrystallization in the poly(2,5-bis(3-hexylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT-C6) and poly(2,5-bis(3-decylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT-C10) blended films, and correlate this cocrystalline structure to the charge transport properties. The as-cast PBTTT-C6/PBTTT-C10 blends exhibit cocrystalline or phase-separated structures influenced by their molecular weights. Interestingly, confined-shearing of initial phase-separated blended solution to MASS produces the formation of their cocrystallization. The cocrystallization kinetics accompanied by the chain packing change and optical properties are scrutinized. Finally, the resulting organic field-effect transistors (OFETs) signify the cocrystal-facilitated charge transport in the blends. Conceptually, this efficient MASS strategy in rendering the cocrystallization in conjugated polymer blends can be readily extended to other conjugated polymer blends of interest for a variety of device applications. This article is protected by copyright. All rights reserved.