Min Yang, Dong Changshuai, Tian Hongkun, Liu Jun, Wang Lixiang
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
ACS Appl Mater Interfaces. 2021 Jul 21;13(28):33321-33327. doi: 10.1021/acsami.1c08514. Epub 2021 Jul 6.
Organic thermoelectric materials play a vital role in flexible power generating applications, such as wearable electronics and sensor networks. While there is a wealth of research on p-type organic thermoelectric materials, developments on n-type counterparts as complementary are comparatively limited. Herein, we report a new kind of n-type small-molecule thermoelectric materials based on B←N-incorporated dibenzo-azaacenes and . Because of the low-lying lowest unoccupied molecular orbital (LUMO) energy levels, and could be efficiently n-doped, and the rigid and almost planar skeleton could ensure good carrier transfer. When doped with a typical n-dopant (4-(1,3-dimethyl-2,3-dihydro-1-benzoimidazol-2-yl)phenyl)dimethylamine (-DMBI), exhibits a moderate conductivity of 0.01 S cm and a power factor of 0.06 μW m K with a Seebeck coefficient of -244.4 μV K in thermoelectric devices. These results not only demonstrate that B←N-incorporated dibenzo-azaacenes are a novel class of n-type thermoelectric materials but also highlight a new strategy to develop n-type organic thermoelectric materials.
有机热电材料在诸如可穿戴电子设备和传感器网络等柔性发电应用中发挥着至关重要的作用。虽然对p型有机热电材料已有大量研究，但作为补充的n型有机热电材料的发展相对有限。在此，我们报道了一种基于含B←N的二苯并氮杂蒽的新型n型小分子热电材料。由于最低未占据分子轨道（LUMO）能级较低，[具体物质1]和[具体物质2]可被高效n掺杂，且刚性且近乎平面的骨架可确保良好的载流子传输。当用典型的n掺杂剂（4-(1,3-二甲基-2,3-二氢-1-苯并咪唑-2-基)苯基）二甲胺（-DMBI）掺杂时，[具体物质1]在热电器件中表现出0.01 S cm的适度电导率、0.06 μW m⁻¹ K⁻²的功率因子以及-244.4 μV K⁻¹的塞贝克系数。这些结果不仅表明含B←N的二苯并氮杂蒽是一类新型的n型热电材料，还突出了一种开发n型有机热电材料的新策略。
