噻唑
聚合物
材料科学
分子内力
结晶度
高分子化学
热电材料
化学
有机化学
复合材料
热导率
作者
Yongchun Li,Wenchang Wu,Yimei Wang,E. Huang,Sang Young Jeong,Han Young Woo,Xugang Guo,Kui Feng
标识
DOI:10.1002/ange.202316214
摘要
Abstract Developing polymers with high electrical conductivity ( σ ) after n‐doping is a great challenge for the advance of the field of organic thermoelectrics (OTEs). Herein, we report a series of thiazole imide‐based n‐type polymers by gradually increasing selenophene content in polymeric backbone. Thanks to the strong intramolecular noncovalent N⋅⋅⋅S interaction and enhanced intermolecular Se⋅⋅⋅Se interaction, with the increase of selenophene content, the polymers show gradually lowered LUMOs, more planar backbone, and improved film crystallinity versus the selenophene‐free analogue. Consequently, polymer PDTzSI−Se with the highest selenophene content achieves a champion σ of 164.0 S cm −1 and a power factor of 49.0 μW m −1 K −2 in the series when applied in OTEs after n‐doping. The σ value is the highest one for n‐type donor‐acceptor OTE materials reported to date. Our work indicates that selenophene substitution is a powerful strategy for developing high‐performance n‐type OTE materials and selenophene incorporated thiazole imides offer an excellent platform in enabling n‐type polymers with high backbone coplanarity, deep‐lying LUMO and enhanced mobility/conductivity.
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