Doping in solution as an order-inducing tool prior to film formation of regio-irregular polyalkylthiophenes

Favorable alignment of regio-irregular poly(3-alkylthiophene)s in a film ca n be attained, despite the fact that these polymers lack an intrinsic tende ncy to form well-ordered supramolecular aggregates. As reported here, align ment can be achieved simply by oxidizing the polymer in solution prior to f ilm formation. A delicate balance between the degree of order and the level of oxidation in solution is observed. These results point to a way to impr ove charge transport efficiency, which is influenced by intra- and intercha in order in the polymer.