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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 2: Organic Photovoltaics: from Single Molecules to Devices

SYOP 2.6: Invited Talk

Thursday, March 26, 2009, 12:00–12:30, BAR SCHÖ

Developments on the acceptor side in plastic PV — •Jan C. Hummelen — Molecular Electronics, Zernike Institute for Advanced Materials & Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands

The intensity of R&D on solar cells based on the bulk heterojunction principle is rapidly increasing during the last 5 years. Much progress has been reported lately on especially bulk heterojunction cells based on the combination of conjugated polymers and fullerene derivatives. One of the present issues in materials design of donor-acceptor combinations is that of the relative energies of the frontier orbitals. Recently, there is increasing discussion concerning the optimum offset between the two LUMO energies, and, related to that, whether molecular (donor-acceptor) based PV would have lower theoretical maximum efficiency then standard inorganic PV. We will address these issues and give an overview of some recent developments. Since most of the energy tuning has been performed on the acceptor components, we will report on the developments with respect to the palette of available acceptor LUMO energies, as well as some latest device results, obtained with new acceptor materials