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Diketopyrrolopyrrole-based acceptors with multi-arms for organic solar cells

机译：基于二酮吡咯并吡咯的多臂受体，用于有机太阳能电池

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Three small molecules SBF-1DPPDCV , SBF-2DPPDCV and SBF-4DPPDCV consisting of a spirobifluorene (SBF) unit as the core and one, two, and four diketopyrrolopyrrole dicyanovinyl (DPPDCV) units as the arms have been designed and synthesized for solution-processed bulk-heterojunction (BHJ) solar cells. The UV-Vis absorption and cyclic voltammetry measurement of these compounds showed that all these compounds have an intense absorption band over 300–750 nm with a LUMO energy level at around ?3.87 eV. When pairing with PTB7-Th as the donor, devices fabricated based on PTB7-Th?:? SBF-4DPPDCV blends showed a decent PCE of 3.85%, which is the highest power conversion efficiency (PCE) amongst the three DPP acceptor fabricated devices without extra treatment. Devices with SBF-1DPPDCV and SBF-2DPPDCV acceptors showed lower PCEs of 0.26% for SBF-1DPPDCV and 0.98% for SBF-2DPPDCV respectively. The three dimensional (3D) structure of SBF-4DPPDCV facilitates the formation of a 3D charge-transport network and thus enables a rational electron-transport ability (1.04 × 10 ~(?4) cm ~(2) V ~(?1) s ~(?1) ), which further leads to a higher J _(sc) (10.71 mA cm ~(?2) ). These findings suggest that multi-arm acceptors present better performance than one-arm or two-arm molecules for organic solar cells.
机译：设计并合成了三个小分子SBF-1DPPDCV，SBF-2DPPDCV和SBF-4DPPDCV，其中一个由螺双芴（SBF）单元作为核心，一个，两个和四个二酮吡咯并吡咯双氰基乙烯基（DPPDCV）单元组成，用于溶液加工体异质结（BHJ）太阳能电池。这些化合物的紫外-可见吸收和循环伏安法测量表明，所有这些化合物在300-750 nm范围内都有很强的吸收带，LUMO能级约为3.87 eV。与PTB7-Th作为供体配对时，基于PTB7-Th？：？ SBF-4DPPDCV共混物显示出不错的PCE，为3.85％，这是三种未经额外处理的DPP受体制造器件中最高的功率转换效率（PCE）。带有SBF-1DPPDCV和SBF-2DPPDCV受体的设备的PCE较低，SBF-1DPPDCV为0.26％，SBF-2DPPDCV为0.98％。 SBF-4DPPDCV的三维（3D）结构有助于形成3D电荷传输网络，从而实现合理的电子传输能力（1.04×10〜（？4）cm〜（2）V〜（？1） s〜（？1）），进一步导致更高的J _（sc）（10.71 mA cm〜（？2））。这些发现表明，对于有机太阳能电池而言，多臂受体的性能优于单臂或两臂分子。

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