A chlorinated polymer promoted analogue co-donors for efficient ternary all-polymer solar cells

作     者：Hui Chen Yikun Guo Pengjie Chao Longzhu Liu Wei Chen Dahui Zhao Feng He 

作者机构：Department of Chemistry and Shenzhen Grubbs Institute Southern University of Science and Technology Beijing National Laboratory for Molecular Sciences Center for Soft Matter Science and Engineering Key Lab of Polymer Chemistry &Physics of the Ministry of Education College of Chemistry Peking University Materials Science Division Argonne National Laboratory Institute for Molecular Engineering the University of Chicago 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2019年第62卷第2期

页      面：238-244页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

基　　金：supported by the SUSTech, the Recruitment Program of Global Youth Experts of China, the National Natural Science Foundation of China (51773087, 21733005) the Natural Science Foundation of Guangdong Province (2016A030313637) Shenzhen Fundamental Research Program (JCYJ20170817111214740) Shenzhen Nobel Prize Scientists Laboratory Project (C17783101) 

主　　题：all-polymer solar cells chlorination analogue codonors ternary blend carriers transport 

摘      要：The efficient ternary all-polymer solar cells(PSCs) are designed and fabricated, using a polymer acceptor of NDP-V-C7 and analogue co-donors containing a chlorinated polymer PBCl T and classical PTB7-Th. PBCl T and PTB7-Th possess very similar chemical structure and matched energy levels to form the cascade of the co-donors. Meanwhile, benefiting from those analogous polymer structures, there is little influence of the morphology in blend film compared to their pristine polymer films. The binary PBCl T:NDP-V-C7 devices exhibit a high open-circuit voltage(V_(oc)) due to the deep HOMO level of PBCl T. The V_(oc)of all-PSCs could be finely manipulated by adjusting the content of PBCl T in blend film. The ternary all-PSCs have the more balanced charge mobility and prolonged carrier lifetime compared to the binary devices. The PBCl T also help improve the miscibility of ternary blend and suppress crystallization in films, bringing about favorable morphology with appropriate orientation and surface roughness in blend film. With the optimal processing, the champion ternary all-PSCs obtain a high PCE of 9.03%, which is about 10% enhancement compared to that of binary device. The results indicate that the ternary approach using analogue co-donors is a practical method to enhance the performance of all-PSCs.