This work reports the synthesis, characterization, photophysical, and photovoltaic properties of five new thieno[3,2‐b][1]benzothiophene isoindigo (TBTI)‐containing low bandgap donor–acceptor conjugated polymers with a series of comonomers and different side chains. When TBTI is combined with different electron‐rich moieties, even small structural variations can have significant impact on thin film morphology of the polymer:phenyl C70 butyric acid methyl ester (PCBM) blends. More importantly, high‐resolution electron energy loss spectroscopy is used to investigate the phase‐separated bulk heterojunction domains, which can be accurately and precisely resolved, enabling an enhanced correlation between polymer chemical structure, photovoltaic device performance, and morphology.

中文翻译：

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用于太阳能电池的替代性噻吩并[3,2-b] [1]苯并噻吩异靛蓝聚合物

这项工作报告了五种新型的噻吩并[3,2- b ] [1]苯并噻吩异靛蓝（TBTI）的低带隙供体-受体共轭聚合物，具有一系列共聚单体和不同侧链，其合成，表征，光物理和光伏性质。当TBTI与不同的富电子部分结合使用时，即使很小的结构变化也会对聚合物的薄膜形态产生重大影响：苯基C70丁酸甲酯（PCBM）共混物。更重要的是，高分辨率电子能量损失谱用于研究相分离的本体异质结域，可以精确地解析它们，从而增强了聚合物化学结构，光伏器件性能和形态之间的相关性。