A tailor-made medium-band gap fluorinated quinoxalinebased conjugated polymer of PBDT-TFQ was designed and synthesized as a donor material for bulk-heterojunction (BHJ) solar cells. This polymer is possessed of an intrachain donor−acceptor architecture and exhibits a broad and strong absorption spectrum across the entire UV−vis region. The introduction of F atoms with high electron affinity to the quinoxaline moiety is effective in further lowering both the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy levels of PBDT-TFQ to attain higher open-circuit voltage (V oc ). With an optimized blend ratio of PBDT-TFQ:PC 71 BM (1:1, w/w), a high power conversion efficiency (PCE) of 8.0% was obtained, with a V oc of 0.76 V, a short-circuit current density (J sc ) of 18.2 mA cm −2 , and a fill factor (FF) of 58.1% under AM 1.5G irradiation. The resulting copolymer reveals an outstanding J sc value, arising from the higher hole mobility of PBDT-TFQ, together with the better continuous percolation pathways within the polymer blend for efficient exciton dissociation and charge transport.

Ein Cluster für alle Fälle: Insulin‐Au‐Nanocluster (NCs) zeigen eine intensive rote Fluoreszenz und exzellente Biokompatibilität, und sie behalten die natürliche Bioaktivität des Insulins zur Senkung des Blutglucosespiegels bei. Mehrere Anwendungen werden demonstriert: in der Fluoreszenzbildgebung, der Röntgen‐Computertomographie und zur Untersuchung von Insulin‐Inhibitor‐Wechselwirkungen (siehe Bild; IDE=Insulin abbauendes Enzym).

A new polymer solar cell with PCE of 6.36% and long-term stability.

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