Tuning the Molecular Weight of Chlorine-Substituted Polymer Donors for Small Energy Loss  

作　　者：Tingxing Zhao Huan Wang Mingrui Pu Hanjian Lai Hui Chen Yulin Zhu Nan Zheng Feng He 

机构地区：[1]Shenzhen Grubbs Institute and Department of Chemistry,Southern University of Science and Technology,Shenzhen,Guangdong 518055,China [2]Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,Guangdong 518055,China [3]Institute of Polymer Optoelectronic Materials and Devices,State Key Loborotory of Luminescent Materials and Devices,South China University of Technology,Guangzhou,Guangdong 510640,China [4]Guangdong Provincial Key Laboratory of Catalysis,Southern University of Science and Technology,Shenzhen,Guangdong 518055,China

出　　处：《Chinese Journal of Chemistry》2021年第6期1651-1658,共8页中国化学（英文版）

基　　金：the National Natural Science Foundation of China(51773087,21975115,21733005);the Shenzhen Fundamental Research program(JCYJ20180302180238419,JCYJ20190809163011543,KQJSCX20180319114442157);Guangdong Provincial Key Laboratory of Catalysis(2020B121201002);Guangdong Innovative and Entrepreneurial Research Team Program(2016ZT06G587);Shenzhen Sci-Tech Fund(KYTDPT20181011104007);We also thank the SUSTech Core Research Facilities for the AFM and TEM measurements.

摘　　要：The molecular weight of polymers plays a major role in their aggregation and miscibility in active layer,which eventually dominate the energy loss and device performance.A series of chlorine-substituted PBD-CI polymers with controlled molecular weight have been synthesized as templates to discern a relationship between molecular weight and the optical properties,energy levels,morphologies,energy loss and photovoltaic performance.Although it has similar optical and electrochemical properties,when blended with acceptor N3,the low molecular weight polymer PBD-CI_(L) gives the biggest energy loss value,and a PCE of 12.06%.PBD-CI_(H) shows a moderate energy loss,but displays the lowest PCE of 9.00%as a result of excessive aggregation.PBD-CI_(M) with a medium molecular weight gives the smallest energy loss and achieves a PCE of 17.17%,which is among one of the highest values recorded to date for the C卜substituted polymer solar cells.Moreover,the molecular weight mainly affects the nonradiative energy loss(△E_(3)), PBD-CI_(M) also shows the smallest value of 0.252 eV among three polymer donors.These results show the effect of controlling the molecular weight to achieve a small energy loss and provide guidelines which can lead to an understanding of the real photovoltaic performance of new materials.

关 键 词：Molecular weight CHLORINE MISCIBILITY Energy loss Renewable resources 

分 类 号：O63[理学—高分子化学]