Abstract We designed and synthesized two novel low band gap small molecule donors (M1 and M2) that consist of benzo[1,2-b:4,5-b′]dithiophene as the electron-rich core and 6,7-difluoroquinoxaline as the electron-deficient end-group. M1 and M2 with A-D-A type structure were synthesized via Stille coupling reaction for use in OSCs. The absorption maximum of the M1 and M2 in solid thin films exhibited at 536 and 540 nm and absorption onset at 582 and 592 nm, corresponding to band gaps of 2.31 and 2.10 eV, respectively. Although the absorption of the M1 with branched alkyl chain was blue shifted as compared to M2, the branched alkyl chain in benzodithiophene core provide appropriate solubility to provide good OSC performance.

中文翻译：

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基于二氟喹喔啉衍生物的有机分子的合成和光伏性能用于 OPV

摘要 我们设计并合成了两种新型低带隙小分子供体（M1 和 M2），它们由作为富电子核心的苯并[1,2-b:4,5-b']二噻吩和作为富电子核心的 6,7-二氟喹喔啉组成。缺电子端基。具有 ADA 类型结构的 M1 和 M2 是通过 Stille 偶联反应合成的，用于 OSC。固体薄膜中 M1 和 M2 的吸收最大值分别出现在 536 和 540 nm 处，吸收开始出现在 582 和 592 nm，分别对应于 2.31 和 2.10 eV 的带隙。尽管与 M2 相比，具有支链烷基链的 M1 的吸收发生蓝移，但苯并二噻吩核心中的支链烷基链提供了适当的溶解度，以提供良好的 OSC 性能。