Typically, conducting polymers transfer either electrons or holes. It is rare to see high bipolar (p- and n-type) electrical conductivities within a single bulk doped organic polymer without the assistant of gate voltage. Herein, we report that FeCl₃-doped solution-processable D–A copolymer poly (2,5-bis(2-octyldodecyl)-3,6-di(thiophen-2-yl)diketopyrrolo[3,4-c]pyrrole-1,4-dione-alt-thieno[3,2-b]thiophen) (DPPTTT) could exhibit a high p-type electrical conductivity of 130.6 S/cm and a good n-type electrical conductivity of 14.2 S/cm by engineering the doping level. Both p- and n-type electrical conductivities were superior to most solution-processable D–A copolymers, including monopolar polymers. The high electrical conductivity resulted in high thermoelectric performance of DPPTTT in both p- and n-type, leading to a high current density of 3 A/cm² for a fully organic planar p–n junction created with only one material. Structural and spectroscopic tests were performed to provide a fundamental understanding of the polarity-switch mechanism. Our results open up an opportunity of making p- and n-type modules with a single conducting polymer for modern organic electronics in the future and might arouse research interest in exploring novel conducting polymers to enrich the knowledge of charge transport in organic materials.

通常，导电聚合物转移电子或空穴。在没有栅极电压辅助的情况下，在单个体掺杂有机聚合物中很少看到高双极（p 型和 n 型）电导率。在此，我们报道 FeCl ₃-掺杂溶液可加工的 D-A 共聚物聚（2,5-双（2-辛基十二烷基）-3,6-二（噻吩-2-基）二酮吡咯并[3,4-c]吡咯-1,4-二酮-通过设计掺杂水平，alt-噻吩并[3,2-b]噻吩) (DPPTTT) 可以表现出 130.6 S/cm 的高 p 型电导率和 14.2 S/cm 的良好 n 型电导率。p 型和 n 型电导率均优于大多数可溶液加工的 D-A 共聚物，包括单极聚合物。高电导率导致 DPPTTT 在 p 型和 n 型中的高热电性能，导致 3 A/cm ²的高电流密度对于仅用一种材料创建的完全有机平面 p-n 结。进行了结构和光谱测试，以提供对极性转换机制的基本理解。我们的研究结果为未来使用单一导电聚合物制造用于现代有机电子学的 p 型和 n 型模块开辟了机会，并可能引起人们对探索新型导电聚合物的研究兴趣，以丰富有机材料中电荷传输的知识。