In this work, poly[3-hexyl-thiophene] (P3HT) polymer was assembled in fibers-like structures using a post-deposition treatment denoted as solvent-annealing-induced nanowetting in templates (SAINT). In this procedure, the as cast P3HT films deposited onto glass (or flexible) substrate are placed in contact with a porous template for instance, anodic alumina oxide (AAO), and then exposed to an atmosphere saturated with vapors of an organic solvent. This will induce a partial dissolution of the polymer and infiltration into the porous. After this, the template can be selectively removed and large areas containing tubular or fibers structures of polymer can be achieved. This is a simple procedure to produce fibers of conjugated polymer in films with enhanced optical and electrical properties that allows their application in optoelectronic devices. (C) 2015 Elsevier B.V. All rights reserved.