Ye Gang, Kuang Yazhuo, Ma Mingyu, Peng Xiantao, Liu Jian
Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Youyi Road 368, Wuhan, 430062, P. R. China.
State Key Laboratory of Polymer Science and Technology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
Adv Sci (Weinh). 2025 Jul;12(25):e2500571. doi: 10.1002/advs.202500571. Epub 2025 Apr 7.
N-type organic thermoelectric materials with excellent device performance and air stability are critically important for practical applications in organic thermoelectric devices. However, the design and synthesis of air-stable n-type conductive materials with high electrical conductivities remain a significant challenge. In this paper, a new strategy is reported to enhance the thermoelectric performance and air stability of naphthalenediimide (NDI)-dialkoxybithiazole-based conjugated polymers by introducing fluorinated alkyl chains terminated polar glycol ether side chains into the NDI unit. After molecular doping with 4-(2,3-dihydro-1,3-dimethyl-1H-benzoimidazol-2-yl) phenyl)-N, N-dimethylbenzenamine (N-DMBI), the doped films of the fluorinated alkyl side-chain modified conjugated polymer exhibit higher electrical conductivity, thus resulting in a greater power factor; and better air stability compared to those of the unmodified polymer with the same conjugated backbone. The work provides insights into material design for the future development of air-stable n-type organic thermoelectrics.
具有优异器件性能和空气稳定性的N型有机热电材料对于有机热电器件的实际应用至关重要。然而，设计和合成具有高电导率的空气稳定N型导电材料仍然是一项重大挑战。本文报道了一种新策略，通过将端接极性二醇醚侧链的氟化烷基链引入萘二亚胺（NDI）-二烷氧基联噻唑基共轭聚合物中，来提高其热电性能和空气稳定性。在用4-(2,3-二氢-1,3-二甲基-1H-苯并咪唑-2-基)苯基)-N,N-二甲基苯甲胺（N-DMBI）进行分子掺杂后，氟化烷基侧链修饰的共轭聚合物的掺杂薄膜表现出更高的电导率，从而产生更大的功率因数；与具有相同共轭主链的未修饰聚合物相比，其空气稳定性也更好。这项工作为空气稳定N型有机热电材料的未来发展提供了材料设计方面的见解。
