Rigid Coplanar Polymers for Stable n-Type Polymer Thermoelectrics
Rigid Coplanar Polymers for Stable n-Type Polymer Thermoelectrics
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DOI：
10.1002/anie.201905835
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发表时间：
2019-08-12
影响因子：
16.6
通讯作者：
Pei, Jian
中科院分区：
文献类型：
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作者：
Lu, Yang;Yu, Zi-Di;Pei, Jian
低的n掺杂效率和较差的稳定性限制了n型共轭聚合物的热电性能，使其性能远远落后于p型共轭聚合物。本文报道了两种刚性共面聚对苯撑乙烯（PPV）衍生物，LPPV-1和LPPV-2，它们显示出几乎无扭转的主链。稠合的缺电子刚性结构赋予衍生物较少的构象无序和低的最低未占分子轨道（LUMO）能级，低至-4.49 eV。掺杂后，两种聚合物表现出高的n-掺杂效率和显着改善的空气稳定性。LPPV-1具有高达1.1 S cm（-1）的高电导率和高达1.96 μ W m（-1）K-2的功率因数。重要的是，掺杂的LPPV-1厚膜的功率因数在暴露于空气7天后仅降低2%。这项工作展示了一种新的策略，用于设计共轭聚合物，平面主链和低LUMO水平，对高性能和潜在的空气稳定的n型聚合物热电。
Low n-doping efficiency and inferior stability restrict the thermoelectric performance of n-type conjugated polymers, making their performance lag far behind of their p-type counterparts. Reported here are two rigid coplanar poly(p-phenylene vinylene) (PPV) derivatives, LPPV-1 and LPPV-2, which show nearly torsion-free backbones. The fused electron-deficient rigid structures endow the derivatives with less conformational disorder and low-lying lowest unoccupied molecular orbital (LUMO) levels, down to -4.49 eV. After doping, two polymers exhibited high n-doping efficiency and significantly improved air stability. LPPV-1 exhibited a high conductivity of up to 1.1 S cm(-1) and a power factor as high as 1.96 mu W m(-1) K-2. Importantly, the power factor of the doped LPPV-1 thick film degraded only 2 % after 7 day exposure to air. This work demonstrates a new strategy for designing conjugated polymers, with planar backbones and low LUMO levels, towards high-performance and potentially air-stable n-type polymer thermoelectrics.