High efficiency polymer semiconductors for organic photovoltaics with improved stability

Stephan Wieder^a, Owen Lozman^a, Lana Nanson^a, Agnieszka Pron^a, Michal Krompiec^a, Graham Morse^a, Priti Tiwana^a, Stephane Berny^a, Nico Seidler^a

^aMerck Chemicals Ltd., Chilworth Technical Centre, University Parkway, SO16 7QD, Southampton

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Nico Seidler, presentation 096
Publication date: 5th February 2015

The development of polymer semiconductors for bulk-heterojunction organic photovoltaics (OPV) has strongly intensified in the past few years, with significant attention on so called “donor-acceptor” or “push-pull” polymer backbone structures. This polymer design approach has enabled the synthesis of a variety of low bandgap polymers (E_g <1.8 eV) with the potential to absorb more photons in the polymer:fullerene photoactive layer and thereby increasing the efficiency of OPV devices. Power conversion efficiencies of over 7% with PC₆₀BM in lab scale devices could be achieved using these novel polymer families. erein we report our efforts to accelerate the commercialisation of OPV products by focussing on formulation of active materials for industrial coating and mass-production of OPV modules. We additionally report improved overall device stability under continuous light at AM1.5G 1 sun illumination as well as under thermal stress by improvements in the formulation of the active material, stack design and the use of novel interlayers.

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