Enhanced n-Type Thermoelectric Performance of Conjugated Polymers Based on an Indandione-Terminated Quinoidal Unit through Comonomer Optimization  

作　　者：Tian Du Yingying Liu Yunfeng Deng Yanhou Geng 

机构地区：[1]School of Materials Science and Engineering and Tianjin Key Laboratory of Molecular Optoelectronic Science,Tianjin University,and,Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin,300072 China [2]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Binhai New City,Fuzhou,Fujian,350207 China

出　　处：《Chinese Journal of Chemistry》2023年第7期776-782,共7页中国化学（英文版）

基　　金：supported by National Key R&D Program of China(2021YFA0717900);National Natural Science Foundation of China(52073209,52121002 and 22222506);the Fundamental Research Funds forthe Central Universities.

摘　　要：Comprehensive Summary Conjugated polymers(CPs)containing quinoidal units are promising in n-type organic thermoelectric materials because of their deep-positioned lowest unoccupied molecular orbital(LUMO)energy levels and planar conjugated backbones.Herein,three CPs have been synthesized by copolymerizing an indandione-terminated quinoidal unit with bithiophene derivatives.Owning to the high electron affinity of the indandione-terminated quinoidal unit,all polymers showed deep LUMO energy levels below-4.10 eV.Incorporating electron-withdrawing substituents(F or CN)on the bithiophene comonomer can further downshift the LUMO energy levels.As a result,a more efficient n-doping process can be realized when employing 4-(2,3-dihydro-1,3-dimethyl-1H-benzimidazol-2-yl)-N,N-dimethylbenzenamine(N-DMBI)as the dopant.Ultimately,the polymer with CN substituents delivered the best thermoelectric performance with a power factor of up to 2.14μW·m^(−1)·K^(−2),because it possessed the lowest LUMO energy level among the three CPs.This work highlights that the modulation of LUMO energy level is an effective strategy to optimize the thermoelectric performance of CPs.

关 键 词：Conjugated polymers Quinoidal compounds Indandione N-DOPING Organic thermoelectrics Organic electronics ELECTRONTRANSFER Energyconversion 

分 类 号：TQ317[化学工程—高聚物工业]