Huaxing Zhou, Liqiang Yang, Samuel C. Price, Kelly Jane Knight and Prof. Dr. Wei You Enhanced Photovoltaic Performance of Low-Bandgap Polymers with Deep LUMO Levels Angewandte Chemie International Edition 49
Mind the gap! Polymers synthesized by replacing the benzene unit in the acceptor 4,7-dithien-2-yl-2,1,3-benzothiadiazole (DTBT) with a π-electron-deficient pyridine unit (DTPyT) show a smaller bandgap than their DTBT counterparts. Power conversion efficiencies of over 6 % are demonstrated in solar cell studies (see picture; PNDT, PQDT, and PBnDT represent dithiophene derivatives as weak donors).
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