Near-infrared double-cable conjugated polymers based on alkyl linkers with tunable length for single-component organic solar cells  

作　　者：Yikun Wang Qiaomei Chen Shijie Liang Dongdong Xia Chaowei Zhao Christopher R.McNeill Weiwei Li 

机构地区：[1]Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029,China [2]Institute of Applied Chemistry,Jiangxi Academy of Sciences,Nanchang 330096,China [3]Department of Materials Science and Engineering,Monash University,Wellington Road,Clayton,Victoria 3800,Australia

出　　处：《Chinese Chemical Letters》2024年第4期452-456,共5页中国化学快报（英文版）

基　　金：jointly supported by the Beijing Natural Science Foundation (Nos.2212045 and JQ21006);the National Natural Science Foundation of China (Nos.21905158, 52073016 and 92163128);further supported by the Fundamental Research Funds for the Central Universities (Nos.buctrc202111, buctrc201828, and XK1802-2);the Opening Foundation of State Key Laboratory of Organic-Inorganic Composites of Beijing University of Chemical Technology (No.oic-202201006);Jiangxi Provincial Department of Science and Technology (Nos.20202ACBL213004, 20212BCJ23035, jxsq2019102004)。

摘　　要：The photovoltaic properties of double-cable conjugated polymers are significantly influenced by the length of the alkyl linkers that connect donor backbones and acceptor side units. In this study, a series of 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile(IC)-based double-cable polymers with alkyl linkers ranging from C_8H_(16)to C_(16)H_(32)(Px, x = 8, 10, 12, 14, 16) were synthesized for single-component organic solar cells(SCOSCs). Among these, the linker length x = 12(P12) is found to optimize the power conversion efficiencies(PCEs) in SCOSCs. Specifically, PCEs increase from P8 to P12 and then decline from P12to P16. Detailed investigations of optical absorption, charge transport, and morphology provide insights into the underlying factors contributing to these PCE variations. The findings indicate that the exceptional photovoltaic properties observed in P12 can be attributed to three key factors: A delicate balance between enhanced charge separation facilitated by the increased spacer length and reduced crystallinity resulting from longer spacers, higher charge mobilities, and well-balanced hole/electron transport characteristics. This study highlights the critical role of linker length in determining the photovoltaic properties of double-cable conjugated polymer-based SCOSCs and offers valuable guidance for the design of novel double-cable conjugated polymers.

关 键 词：Single-component organic solar cells Double-cable conjugated polymers Photovoltaic properties Alkyl linkers 

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]