A distannylated electron‐deficient bithiophene imide (BTI‐Tin) monomer was synthesized and polymerized with imide‐functionalized co‐units to afford homopolymer PBTI and copolymer P(BTI‐BTI2), both featuring an acceptor–acceptor backbone with high molecular weight. Both polymers exhibited excellent unipolar n‐type character in transistors with electron mobility up to 2.60 cm² V⁻¹ s⁻¹. When applied as acceptor materials in all‐polymer solar cells, PBTI and P(BTI‐BTI2) achieved high power‐conversion efficiency (PCE) of 6.67 % and 8.61 %, respectively. The PCE (6.67 %) of polymer PBTI, synthesized from the distannylated monomer, is much higher than that (0.14 %) of the same polymer PBTI*, synthesized from typical dibrominated monomer. The 8.61 % PCE of copolymer P(BTI‐BTI2) is also higher than those (<1 %) of homopolymers synthesized from dibrominated monomers. The results demonstrate the success of BTI‐Tin for accessing n‐type polymers with greatly improved device performance.

中文翻译：

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二甲双胍化的二噻吩酰亚胺：通过受体-主链实现高性能n型聚合物半导体。

合成了一种脱甲酰化的缺电子联噻吩亚胺（BTI-Tin）单体，并与酰亚胺官能化的共聚单元聚合，得到均聚物PBTI和共聚物P（BTI-BTI2），两者均具有高分子量的受体-受体主链。两种聚合物均在电子迁移率高达2.60 cm ²  V ^-1  s ^-1的晶体管中表现出出色的单极n型特性。。当用作全聚合物太阳能电池的受体材料时，PBTI和P（BTI-BTI2）分别实现了6.67％和8.61％的高功率转换效率（PCE）。由二苯甲酸酯化的单体合成的聚合物PBTI的PCE（6.67％）远远高于由典型的二溴代单体合成的同一聚合物PBTI *的PCE（0.14％）。共聚物P（BTI-BTI2）的8.61％PCE也高于由二溴代单体合成的均聚物的PCE（<1％）。结果表明BTI-Tin在访问n型聚合物方面取得了成功，并且器件性能大大提高。