Enhanced n-Doping Efficiency of a Naphthalenediimide-Based Copolymer through Polar Side Chains for Organic Thermoelectrics.
Enhanced n-Doping Efficiency of a Naphthalenediimide-Based Copolymer through Polar Side Chains for Organic Thermoelectrics.
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DOI：
10.1021/acsenergylett.7b01146
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发表时间：
2018-02-09
影响因子：
22
通讯作者：
Müller C
中科院分区：
文献类型：
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作者：
Kiefer D;Giovannitti A;Sun H;Biskup T;Hofmann A;Koopmans M;Cendra C;Weber S;Anton Koster LJ;Olsson E;Rivnay J;Fabiano S;McCulloch I;Müller C
共轭聚合物的氮掺杂要么需要较高的掺杂量，要么与分子掺杂剂的相容性较差，导致电导率较低。我们探索了带有低聚乙二醇基侧链的极性萘二亚胺-联噻吩共聚物P(GNDI-GT2)的n掺杂，表明该聚合物与苯并咪唑-二甲基苯胺基n-掺杂剂N-DMBI表现出良好的相容性。P(GNDI-GT2)与N-DMBI具有良好的相容性，对n-掺杂的掺杂效率较高，可达13%，在惰性气氛中，当掺杂浓度仅为10mol%时，电导率可达10-1 S cm-1以上。我们发现，掺杂的聚合物在暴露于空气中时能够保持其导电性约20分钟，当返回到氮气气氛中时能够迅速恢复。总体而言，与其他基于NDI的聚合物相比，p(GNDI-GT2)和N-DMBI的溶液共处理产生了更大的热电功率因数，高达0.4μW K-2 m-1。
N-doping of conjugated polymers either requires a high dopant fraction or yields a low electrical conductivity because of their poor compatibility with molecular dopants. We explore n-doping of the polar naphthalenediimide–bithiophene copolymer p(gNDI-gT2) that carries oligoethylene glycol-based side chains and show that the polymer displays superior miscibility with the benzimidazole–dimethylbenzenamine-based n-dopant N-DMBI. The good compatibility of p(gNDI-gT2) and N-DMBI results in a relatively high doping efficiency of 13% for n-dopants, which leads to a high electrical conductivity of more than 10–1 S cm–1 for a dopant concentration of only 10 mol % when measured in an inert atmosphere. We find that the doped polymer is able to maintain its electrical conductivity for about 20 min when exposed to air and recovers rapidly when returned to a nitrogen atmosphere. Overall, solution coprocessing of p(gNDI-gT2) and N-DMBI results in a larger thermoelectric power factor of up to 0.4 μW K–2 m–1 compared to other NDI-based polymers.
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