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Published on: November 5, 2014
Small Molecule Near-Infrared Boron Dipyrromethene Donors for Organic Tandem Solar Cells
Tian-Yi Li1, Toni Meyer1, Zaifei Ma1
1Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP), Technische Universität Dresden , Nöthnitzer Street 61, 01187 Dresden, Germany.
Abstract:
Three furan fused boron dipyrromethenes (BODIPYs) with a CF3 group on the meso-carbon are synthesized as near-infrared absorbing materials for vacuum processable organic solar cells. The best single junction device reaches a short-circuit current (jsc) of 13.3 mA cm-2 and a power conversion efficiency (PCE) of 6.1%. These values are highly promising for an electron donor material with an absorption onset beyond 900 nm. In a tandem solar cell comprising a NIR BODIPY subcell and a matching "green" absorber subcell, complementary absorption is achieved, resulting in PCE of ∼10%.
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