Effects of Flexible Conjugation-Break Spacers of Non-Conjugated Polymer Acceptors on Photovoltaic and Mechanical Properties of All-Polymer Solar Cells  

作　　者：Qiaonan Chen Yung Hee Han Leandro R.Franco Cleber F.N.Marchiori Zewdneh Genene CMoyses Araujo Jin-Woo Lee Tan Ngoc-Lan Phan Jingnan Wu Donghong Yu Dong Jun Kim Taek-Soo Kim Lintao Hou Bumjoon J.Kim Ergang Wang 

机构地区：[1]Siyuan Laboratory,Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials,Department of Physics,Jinan University,Guangzhou 510632,People’s Republic of China [2]Department of Chemistry and Chemical Engineering,Chalmers University of Technology,SE-41296,Göteborg,Sweden [3]Department of Chemical and Biomolecular Engineering,Korea Advanced Institute of Science and Technology(KAIST),Daejeon 34141,Republic of Korea [4]Department of Engineering and Physics,Karlstad University,65188 Karlstad,Sweden [5]Department of Chemistry and Bioscience,Aalborg University,9220 Aalborg,Denmark [6]Department of Mechanical Engineering,Korea Advanced Institute of Science and Technology(KAIST),Daejeon 34141,Republic of Korea [7]Materials Theory Division,Department of Physics and Astronomy,Uppsala University,75120 Uppsala,Sweden [8]Sino-Danish Center for Education and Research,8000 Aarhus,Denmark [9]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第10期164-177,共14页纳微快报（英文版）

基　　金：the Swedish Research Council (2016-06146,2019-02345);Swedish Research Council (grant no.2020-05223);the Swedish Research Council Formas,the Swedish Energy Agency (52473-1);the Wallenberg Foundation (2017.0186 and 2016.0059) for financial support;supported by the National Research Foundation of Korea (NRF-2017M3A7B8065584 and 2020R1A4A1018516);Support from the National Natural Science Foundation of China (61774077);the Key Projects of Joint Fund of Basic and Applied Basic Research Fund of Guangdong Province (2019B1515120073);the Research Fund of Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology (No.2020B1212030010);Support from Sino-Danish Center for Education and Research;Swedish Energy Agency (grant no.45420-1)

摘　　要：All-polymer solar cells(all-PSCs)possess attractive merits including superior thermal stability and mechanical flexibility for large-area roll-to-roll processing.Introducing flexible conjugation-break spacers(FCBSs)into backbones of polymer donor(P_(D))or polymer acceptor(P_(A))has been demonstrated as an efficient approach to enhance both the photovoltaic(PV)and mechanical properties of the all-PSCs.However,length dependency of FCBS on certain all-PSC related properties has not been systematically explored.In this regard,we report a series of new non-conjugated P_(A)s by incorporating FCBS with various lengths(2,4,and 8 carbon atoms in thioalkyl segments).Unlike com-mon studies on so-called side-chain engineering,where longer side chains would lead to better solubility of those resulting polymers,in this work,we observe that the solubilities and the resulting photovoltaic/mechanical properties are optimized by a proper FCBS length(i.e.,C2)in P_(A) named PYTS-C2.Its all-PSC achieves a high efficiency of 11.37%,and excellent mechanical robustness with a crack onset strain of 12.39%,significantly superior to those of the other P_(A)s.These results firstly demonstrate the effects of FCBS lengths on the PV performance and mechanical properties of the all-PSCs,providing an effective strategy to fine-tune the structures of P_(A)s for highly efficient and mechanically robust PSCs.

关 键 词：All-polymer solar cells Flexible conjugation-break spacers Mechanical robustness Polymer acceptors Stretchability 

分 类 号：TM914.4[电气工程—电力电子与电力传动]