The remarkable progress achieved in the last years in the field of the organic photovoltaics has resulted from a combined development of materials and device engineering. Photoinduced charge separation and transport are two key processes determining OPVs efficiency and which largely depend on the details of the phase separation between electron-donor (D) and electron-acceptor (A). We have been investigating photoacid cross-linkable polymers to fabricate OPVs with nanostructured D/A interfaces, based on a patterning process using an assisting polymer [1] . In this communication, we present an overview of the materials we have so far prepared, their characterisation and their use in OPVs. We will mainly focus on the role of the D/A nanostructuring on the OPVs performance and prospects for improvement.

Acknowledgments: FCT-Portugal, under the contracts PTDC/CTM-NAN/111263/2009 and PTDC/CTM/101627/2008, for financial support.

[1] J. Farinhas et al, J. Mater. Chem. 21, 12511 (2011).