【摘 要】
：
Design and synthesis of low bandgap (LBG) polymer donors is inevitably challenging and their process-ability from a non-halogenated solvent system remains a hurdle to overcome in the area of high-performance polymer solar cells (PSCs),Due to a high aggreg
【机 构】
：
Energy Materials Research Center,Korea Research Institute of Chemical Technology (KRICT),141 Gajeong
论文部分内容阅读
Design and synthesis of low bandgap (LBG) polymer donors is inevitably challenging and their process-ability from a non-halogenated solvent system remains a hurdle to overcome in the area of high-performance polymer solar cells (PSCs),Due to a high aggregation tendency of LBG polymers,especially diketopyrrolopyrrole (DPP)-based polymers coupled with bithiophenes in the polymer backbones,their widespread adoption in non-halogenated solvent-processed PSCs has been limited.Herein,a novel LBG DPP-based polymer,called PDPP4T-1F with asymmetric arrangement of fluorine atom,has been success-fully synthesized and showed an outstanding power conversion efficiency (PCE) of 10.10％ in a single-junction fullerene-based PSCs.Furthermore,an impressive PCE of 13.21％ has been achieved in a tandem device from a fully non-halogenated solvent system,which integrates a wide bandgap PDTBTBz-2F poly-mer in the bottom cell and LBG PDPP4T-1F polymer in the top cell.The achieved efficiency is the highest value reported in the literature to date in fullerene-based tandem PSCs.We found that a uniformly dis-tributed interpenetrating fibril network with nano-scale phase separation and anisotropy of the polymer backbone orientation for efficient charge transfer/transport and suppressed charge recombination in PDPP4T-1 F-based PSCs led to outstanding PCEs in single and tandem-junction PSCs.
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