Structure-Property Relationship of Conjugated Polymers Utilizing Isomerized Fused Benzothiadiazole-Based Building Blocks  

作　　者：Jingyu Liu Wenhao Li Kaihu Xian Zhongwei Liu Yanru Li Xiang Yao Long Ye Yan Zhao Zhuping Fei 

机构地区：[1]Institute of Molecular Plus,Department of Chemistry,Tianjin Key Laboratory of Molecular Optoelectronic Science,Tianjin University,Tianjin,300072 China [2]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin,300192 China [3]Laboratory of Molecular Materials and Devices,Department of Materials Science,Fudan University,Shanghai,200438 China [4]School of Materials Science and Engineering,Tianjin University,Tianjin,300072 China

出　　处：《Chinese Journal of Chemistry》2023年第19期2525-2530,共6页中国化学（英文版）

基　　金：The authors are grateful to the National Key Research and Development Program(2018YFA0703200);the National Nat-ural Science Foundation of China(No.21975176).

摘　　要：Only a few fused benzothiadizole(BTz)based conjugated polymers have been applied in organic field-effect transistors(OFETs),and their performances were low,mainly due to the lack of available building blocks and in-depth study of the relationship between structure and performance.Herein,we report two isomeric fused BTz-based building blocks(M1 and M2)and their copolymers PBTzVBTz-T and PBTzVBTz-TT,PTVT-T and PTVT-TT.DFT study showed all polymers had nearly planar backbone geometries,and PBTzVBTz-TT exhibited the most linear backbone.PTVT-T and PTVT-TT exhibited red-shift absorption spectra and deeper LUMO level than those of PBTzVBTz-T and PBTzVBTz-TT.Thin film microstructure study demonstrated PBTzVBTz-TT and PTVT-TT had edge-on molecular orientation,while the others had the mixed molecular orientation of edge-on and face-on.Furthermore,PBTzVBTz-TT had the longest coherence length in thin film.All these features of PBTzVBTz-TT resulted in its highest carrier mobility of 0.1 cm^(2)·V^(–1)·s^(–1) among these polymers.

关 键 词：Conjugated polymers Organic field-effect transistors BENZOTHIADIAZOLE ISOMERIZATION Fused-ring systems 

分 类 号：O63[理学—高分子化学]