Conjugation expansion strategy enables highly stable all-polymer solar cells

作     者：Dingding Qiu Yanan Shi Yi Li Jianqi Zhang Kun Lu Zhixiang Wei Dingding Qiu;Yanan Shi;Yi Li;Jianqi Zhang;Kun Lu;Zhixiang Wei

作者机构：CAS Key Laboratory of Nanosystem and Hierarchical FabricationCAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of SciencesBeijing 100049China Department of ChemistryMolecular Dynamic Chemistry CenterTianjin Key Laboratory of Molecular Optoelectronic SciencesSchool of ScienceTianjin UniversityTianjin 300354China Sino-Danish Center for Education and ResearchSino-Danish CollegeUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2023年第34卷第8期

页      面：439-443页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：We acknowledge financial support provided by the National Natural Science Foundation of China(Nos.21822503 and 51973043) the and the CAS-CSIRO Joint Project of Chinese Academy of Sciences(No.121E32KYSB20190021) 

主　　题：Polymer donor Conjugation expansion All-polymer organic solar cells Stability Crystallinity 

摘      要：The stability issue is one of the key factors hindering the commercial application of organic solar ***-polymer organic solar cell is one of the effective ways to solve the stability *** this work,we designed and synthesized two polymer donor materials PBDT and PDTBDT with different conjugation ranges,and demonstrated for the first time that extending the conjugation range of donor materials in all polymer solar cells can significantly improve device efficiency and *** experimental results of materials and devices show that PDTBDT with a larger conjugation range has stronger crystallinity and a more planar structure,which endows the active layer in its corresponding device with higher exciton dissociation probability,lower carrier recombination probability,more balanced charge transport properties and more favorable film *** a result,the PDTBDT:PYF-T-o devices display an outstanding PCE of 13.38%,which is much higher than PBDT with smaller conjugation range based ***,the PDTBDT:PYF-T-o device retains 0.86 of the initial PCE after over 500 h in the air atmosphere,exhibiting significantly improved *** improved stability is attributed to the enhanced moisture and air tolerance of active layer film thanks to the strong crystallinity of the donor *** results demonstrate that the conjugation expansion strategy is one of the effective ways to obtain efficient and stable all-polymer organic solar cells.