Methylthionated benzo[1,2-b:4,5-b']dithiophenes: a model study to control packing structures and molecular orientation in thienoacene-based organic semiconductors.

Abstract

Methylthionation on benzo[1,2-b:4,5-b']dithiophene (BDT) was examined as a promising molecular functionalization strategy to tune the packing structure and molecular orientation on the substrates. β-Methylthionated BDT with a rubrene-like "pitched" π-stacking showed higher mobility than its α-counterpart with a herringbone packing in single-crystal organic field-effect transistors (SC-OFETs).