Constructing vertical phase separation of polymer blends via mixed solvents to enhance their photovoltaic performance

作     者：Qingqing Yang Jiantai Wang Xiaoqin Zhang Jun Zhang Yingying Fu Zhiyuan Xie 

作者机构：State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences 

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

年 卷 期：2015年第58卷第2期

页      面：309-316页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Basic Research Program of China(2014CB643504) the National Natural Science Foundation of China(51325303,51273193,21334006) the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB12030200) 

主　　题：polymer solar cells polymer blends vertical phase separation bimolecular recombination S-kink 

摘      要：A polymer blend comprising poly(3-hexylthiophene)(P3HT)donor and poly[2,7-(9,9′-octyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-5′,6′-bis(hexyloxy)-2′,1′,3′-benzothiadiazole)](PFDTBT-OC6)acceptor is used as the active layer to fabricate all-polymer solar *** blend morphology variance processed with pure and mixed solvents,and the related photovoltaic performance,are investigated in *** is found that,due to its low surface energy,a thin P3HT enrichment layer on the top surface of the active layer greatly increases bimolecular recombination and results in S-kinks of the illuminated current density-voltage *** the incorporation of p-xylene(a marginal solvent of P3HT)in the blend solution,the P3HT enrichment atop the active layer surface is effectively decreased because the high boiling-point p-xylene suppresses the diffusion of P3HT chains toward the top surface during the film-drying *** bimolecular recombination was thus improved and the S-kinks of the photovoltaic curves were completely *** overall power conversion efficiencies of the devices are strongly boosted(from 0.88%to 1.41%)when chlorobenzene:p-xylene mixed solvent is used to replace pure chlorobenzene.