A successful method to fabricate large-area, microstructured sieve material
s (see Figure) from a poly(p-phenylene-vinylene) (PPV) precursor and from p
oly(3-octylthiophene) (P3OT) is reported. Strong periodicity and a large, d
efect-free area make this structure extremely interesting for polymer optoe
lectronics. The underlying mechanism of the self-organized pattern-formatio
n is elaborated in this work.