A novel fused heterocycle-flanked diketopyrrolopyrrole (DPP) monomer, thieno[2,3-b]pyridine diketopyrrolopyrrole (TPDPP), was designed and synthesized. When copolymerized with 3,4-difluorothiophene using Stille coupling polymerization, the new polymer pTPDPP-TF possesses a highly planar conjugated polymer backbone due to the fused thieno[2,3-b]pyridine flanking unit that effectively alleviates the steric hindrance with both the central DPP core and the 3,4-difluorothiophene repeat unit. This new polymer exhibits a high electron affinity (EA) of −4.1 eV and was successfully utilized as an n-type polymer semiconductor for applications in organic field-effect transistors (OFETs) and all polymer solar cells. A promising n-type charge carrier mobility of 0.1 cm² V^–1 s^–1 was obtained in bottom-contact, top-gate OFETs, and a power conversion efficiency (PCE) of 2.72% with a high open-circuit voltage (V_OC) of 1.04 V was achieved for all polymer solar cells using PTB7-Th as the polymer donor.

中文翻译：

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噻吩并[2,3 - b ]吡啶侧翼的二酮吡咯并吡咯聚合物作为用于全聚合物太阳能电池和有机场效应晶体管的n型聚合物半导体

设计并合成了一种新型的稠合杂环侧翼二酮吡咯并吡咯（DPP）单体，噻吩并[2,3- b ]吡啶二酮吡咯并吡咯（TPDPP）。当使用Stille偶联聚合法与3,4-二氟噻吩共聚时，由于稠合的噻吩并[2,3- b ]吡啶侧翼单元可有效减轻两个分子的位阻，因此新型聚合物pTPDPP-TF具有高度平面的共轭聚合物主链。中央DPP核心和3,4-二氟噻吩重复单元。这种新型聚合物表现出-4.1 eV的高电子亲和力（EA），并已成功地用作有机场效应晶体管（OFET）和所有聚合物太阳能电池中的n型聚合物半导体。0.1 cm ² V的有前途的n型电荷载流子迁移率在底部接触式，顶部栅极的OFET中获得了^–1 s ^–1，并且使用以下方法的所有聚合物太阳能电池均实现了2.72％的功率转换效率（PCE ）和1.04 V的高开路电压（V _OC） PTB7-Th作为聚合物供体。