A soluble 4H‐cyclopenta[2,1‐b;3,4‐b′]dithiophene‐4‐one (CPDTO)‐based polymer (C₆‐PCPDTO) has been synthesized from two monomers derived from nonalkylated CPDTO and didodecyl CPDTO (C₁₂‐CPDTO). Proton NMR, thermal analysis, UV–vis absorption, cyclic voltammetry, and XRD are used to characterize the polymer in solution and film. The new polymer has an optical bandgap of 1.28 eV in film, and has strong interchain interaction in chloroform solutions. The polymer contains a significant amount of homocoupled segments. The regular segments and homocoupled CPDTO segments render the polymer highly aggregating in solution. The non‐planar homocoupled C₁₂‐CPDTO segments prevent the polymer from forming regular π‐stacks, resulting in a low SCLC hole mobility (3.88 × 10⁻⁷ cm²V⁻¹s⁻¹). CV experiments show that C₆‐PCPDTO is stable in its oxidized and reduced states. Solar cell devices were fabricated from C₆‐PCPDTO2:PC₆₀BM blends of different weight ratios. High PC₆₀BM loading (80% or greater) was required for the devices to show measurable efficiency, indicating that the limited π‐stacking of the polymer is not sufficient to cause effective phase separation. Further development of synthetic method is still needed to eliminate structural defects so that long‐range ordered pi‐stacking can be realized in the polymer for these applications. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 1077–1085

中文翻译：

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4H-环戊四[2,1-b：3,4-b']二噻吩-4-一（CPDTO）均聚物，每隔一个CPDTO带有侧链

由两个非烷基化的CPDTO和双十二烷基CPDTO衍生的单体合成了可溶的4H-环戊基[ 2,1- b ; 3,4- b ']二噻吩-4-一（CPDTO）基聚合物（C _6- PCPDTO）（ C _12- CPDTO）。质子核磁共振，热分析，紫外-可见吸收，循环伏安法和XRD用于表征溶液和薄膜中的聚合物。新型聚合物的薄膜带隙为1.28 eV，在氯仿溶液中具有很强的链间相互作用。该聚合物包含大量的均偶联链段。规则链段和均相偶联的CPDTO链段使聚合物在溶液中高度聚集。非平面均耦合C ₁₂‐CPDTO链段会阻止聚合物形成规则的π堆积，从而导致SCLC空穴迁移率较低（3.88×10 ^-7 cm ² V ^-1 s ^-1）。CV实验表明，C ₆ -PCPDTO在其氧化态和还原态均稳定。太阳能电池设备由不同重量比的C ₆ -PCPDTO2：PC ₆₀ BM混合物制成。高PC ₆₀该设备需要BM负载（80％或更高）才能显示出可测量的效率，这表明聚合物的有限π堆积不足以引起有效的相分离。仍然需要进一步发展合成方法以消除结构缺陷，以便在这些应用中可以实现聚合物的长程有序pi堆积。©2017 Wiley Periodicals，Inc. J. Polym。科学，A部分：Polym。化学 2017年，55，1077至85年