Abstract
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 C8H16 to C16H32(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 conver-sion efficiencies(PCEs)in SCOSCs.Specifically,PCEs increase from P8 to P12 and then decline from P12 to 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 excep-tional 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 charac-teristics.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.
基金项目
北京市自然科学基金(2212045)
北京市自然科学基金(JQ21006)
国家自然科学基金(21905158)
国家自然科学基金(52073016)
国家自然科学基金(92163128)
中央高校基本科研业务费专项(buctrc202111)
中央高校基本科研业务费专项(buctrc201828)
中央高校基本科研业务费专项(XK1802-2)
Opening Foundation of State Key Laboratory of Organic-Inorganic Composites of Beijing University of Chemical Technology(oic-202201006)
江西省科技厅项目(20202ACBL213004)
江西省科技厅项目(20212BCJ23035)
江西省科技厅项目(jxsq2019102004)
NETL
NSTL
万方数据