Fused-ring induced end-on orientation in conjugated molecular dyads toward efficient single-component organic solar cells  

作　　者：Dongdong Xia Shengxi Zhou Wen Liang Tan Safakath Karuthedath Chengyi Xiao Chaowei Zhao Frédéric Laquai Christopher R.McNeill Weiwei Li 

机构地区：[1]Institute of Applied Chemistry,Jiangxi Academy of Sciences,Nanchang,China [2]Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing,China [3]Department of Materials Science and Engineering,Monash University,Clayton,Australia [4]KAUST Solar Center(KSC),Physical Sciences and Engineering Division(PSE),Material Science and Engineering Program(MSE),King Abdullah University of Science and Technology(KAUST),Thuwal,Saudi Arabia

出　　处：《Aggregate》2023年第2期291-299,共9页聚集体（英文）

基　　金：Beijing Natural Science Foundation,Grant/Award Number:JQ210065;NSFC,Grant/Award Numbers:52073016,92163128;Fundamental Research Funds for the Central Universities,Grant/Award Numbers:buctrc201828,XK1802-2;The opening Foundation of State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Grant/Award Number:oic-202201006;Jiangxi Provincial Department of Science and Technology,Grant/Award Numbers:20202ACBL213004,20212BCJ23035,jxsq2019102004,20203BBE53062;Jiangxi Academy of Sciences,Grant/Award Numbers:2021YSBG22034,2021YSBG22033,2020-YZD-3;Australian Research Council,Grant/Award Number:FT180100594。

摘　　要：The molecular orientations of conjugated materials on the substrate mainly include edge-on,face-on,and end-on.Edge-on and face-on orientations have been widely observed,while end-on orientation has been rarely reported.Since in organic solar cells(OSCs)charge transport is along the vertical direction,end-on orientation with conjugated backbones perpendicular to the substrate is recognized as the ideal microstructure for OSCs.In this work,we for the first time obtained the preferential end-on orientation in a conjugated molecular dyad that contains a conjugated backbone as donor and perylene bisimide side units as acceptor.This was realized by introducing a fused-ring structure to replace linear terthiophenes with conjugated backbones,yielding F-MDPBI and L-MDPBI respectively.Surprisingly,a shifting trend of the molecular orientation from dominating edge-on in L-MDPBI to preferential end-on in F-MDPBI was observed.As a consequence,vertical charge carrier mobilities in F-MDPBI are one order of magnitude higher than those with preferential edge-on orientation,so single-component OSCs based on this molecular dyad as a single photoactive layer provided a power conversion efficiency of 4.89% compared to 1.70% based on L-MDPBI with preferential edge-on orientation.

关 键 词：conjugated molecular dyads crystallinity edge-on END-ON single-component organic solar cells 

分 类 号：TQ317[化学工程—高聚物工业] TM914.4[电气工程—电力电子与电力传动]