氯取代近红外双缆共轭高分子材料与低能量损失单组分有机太阳能电池  

Chlorine-Substituted Double-Cable Conjugated Polymers with Near-Infrared Absorption for Low Energy Loss Single-Component Organic Solar Cells

作　　者：李若男 梁世洁 许韵华[1] 张翠芬 唐正 刘柏侨 李韦伟 Ruonan Li;Shijie Liang;Yunhua Xu;Cuifen Zhang;Zheng Tang;Baiqiao Liu;Weiwei Li(School of Physical Science and Engineering,Beijing Jiaotong University,Beijing 100044,China;State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China;Research Center for Intelligent Chips and Devices,Zhejiang Lab,Hangzhou 311121,China;State Center for Advanced Low-dimension Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]北京交通大学物理科学与工程学院,北京100044 [2]北京化工大学有机无机复合材料国家重点实验室,北京100029 [3]之江实验室,智能芯片与器件研究中心,杭州311121 [4]东华大学先进低维材料中心,上海201620

出　　处：《物理化学学报》2024年第8期28-35,共8页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(52073016,22105180)资助项目。

摘　　要：近红外型双缆共轭高分子材料的光电转换效率(PCE)已经超过了10%,然而较大的能量损失限制了其性能的进一步提升。本工作中,我们合成了两个氯取代的近红外双缆共轭聚合物材料,分别命名为as-DCPIC-Cl和as-DCPIC-2Cl。氯原子的引入使得单组分有机太阳能电池的能量损失低至0.57 eV。其中,基于as-DCPIC-Cl的器件实现了10.14%的PCE,为基于非稠环电子受体的双缆共轭聚合物的最高性能。研究表明,氯原子在实现高性能单组分有机太阳能电池方面具有重要的作用。Single-component organic solar cells(SCOSCs)have emerged as promising candidates for renewable energy applications due to their simplified film fabrication process and well-controlled morphology.High-performance SCOSCs typically employ active layer materials comprising block copolymers and double-cable conjugated polymers.Among these,double-cable conjugated polymers have attracted a lot of interest in SCOSCs due to their precisely defined structure and easily controllable microphase morphology.In the early stages of double-cable conjugated polymers,most of them contain the polythiophene backbone and fullerene side units,severely limiting the development of SCOSCs.Fortunately,the emergence of novel materials has progressively led to the development of new types of double-cable conjugated polymers.Double-cable conjugated polymers based on acylimide compound have exhibited device performances exceeding 8%.Nevertheless,acylimide-type electron acceptors exhibit a limited photo-response range,resulting in lower photocurrents in SCOSCs.The utilization of A-D-A-type electron acceptors(where D represents electron-donating groups and A represents electron-withdrawing groups)have effectively broadened the absorption spectra of materials due to induced intramolecular charge transfer.Double-cable polymers using A-D-A-type electron acceptors as the side units have achieved efficiencies exceeding 10%.However,significant voltage losses have hampered further improvements in their performance.Chlorine atoms play a crucial role in organic solar cells due to enhanced crystallinity in both chlorine-substituted donor polymers and acceptor molecules,and they can also adjust material energy levels and optimize film morphology.Nevertheless,their role in SCOSCs has been scarcely explored.This limitation arises from the increased complexity of morphology control in double-cable conjugated polymers,where the donor and acceptor segments are covalently linked in one molecule making their crystalline behavior more complicated on account of the

关 键 词：双缆共轭高分子 单组分有机太阳能电池 近红外 能量损失 

分 类 号：O646[理学—物理化学]