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Polymer solar cells rely on acceptor materials that are able to rapidly collect and transport charges from excitons. The high electron affinity of fullerenes and their derivatives like PCBM, ensured them a dominant role among acceptor materials, allowing for the obtainment of devices with high efficiencies. Despite their long-standing use, very little is known about the solid-state behaviour of these acceptors in the devices and about the presence of noncovalent interactions involving such molecules and additives. The project aims to structurally characterize mono- and multi-component fullerenes and fullerene derivatives solid phases by means of X-Ray and/or electron diffraction techniques. The results will be of fundamental importance in order to understand the self-organization processes and the aging mechanisms occurring in the devices, giving important hints for the improvement of the efficiency and the lifetime of polymer solar cells
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