Breath figures of P3HT and of its photovoltaic blend with PC71BM

Surface structured films of poly(3-hexyl thiophene) and of its photovoltaic blend with PC71BM are obtained by the breath fi gure technique, a micropatterning process that is based on the competition between solvent evaporation and water condensation. By this method, long range honey-comb like ordered structures of these functional organic blends are obtained. The characterization of these systems by several techniques including micron-resolved Raman Spectroscopy, microphotoluminiscence and Kelvin probe microscopy allow to probe that, due to the different hydrophobicity of both components of the blend, a hierarchical phase separation is obtained around the pores formed.