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

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Chinese Chemical Letters 2024年第4期35卷 452-456页

作者： Yikun Wang Qiaomei Chen Shijie Liang Dongdong Xia Chaowei Zhao Christopher R.McNeill Weiwei Li Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Institute of Applied Chemistry Jiangxi Academy of SciencesNanchang 330096China Department of Materials Science and Engineering Monash UniversityWellington RoadClaytonVictoria 3800Australia

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

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double-cable conjugated polymers with Fullerene Pendant for Single-Component Organic Solar Cells

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Chinese Journal of Polymer Science 2022年第8期40卷 898-904,I0007页

作者： Bai-Qiao Liu Yun-Hua Xu Feng Liu Cheng-Cheng Xie Shi-Jie Liang Qiao-Mei Chen Wei-Wei Li Department of Chemistry School of ScienceBeijing Jiaotong UniversityBeijing100044China Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China

In this work,the“functionalization-polymerization”(FP)method has been used to construct fullerene-contained double-cable conjugated polymers with“donor-acceptor”backbones.It was realized via synthesizing a fullerene-contained monomer and performing Stille polymerization.With this method,a series of double-cable conjugated polymers with different fullerene contents were developed and applied into single-component organic solar cells.The power conversion efficiencies(PCEs)based on these polymers increased from 0.71%to 1.71%with the enhanced fullerene contents.The relatively low PCEs might be originated from the poor microstructure in these polymers.These new conjugated polymers with molecular heterojunction would show potential application in organic electronic devices.

关键词： double-cable conjugated polymers Single-component organic solar cells Fullerene “Donor-acceptor”conjugated polymers Microphase separation

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Low temperature,non-halogen solvent processed single-component organic solar cells with 10%efficiency

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Chinese Chemical Letters 2023年第12期34卷 241-245页

作者： Zhou Zhang Jjing Wang Zhijie Hu Chengyi Xiao Qiaomei Chen Zheng Tang Weiwei Li Bejing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-Inorganic Composites Bejing University of Chemical TechnologyBeijing 100029China Center for Advanced Low-dimension Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

A double-cable conjugated polymer DCPIC-BO is designed via introducing a long-branched alkyl chains 2-buthyloctyl into the acceptor side unit.Compared with the double-cable polymer(DCPIC-EH)with the 2-ethylhexyl alkyl chains,the solubility of the DCPIC-BO in non-halogen solvents is substantially improved.Therefore,a power conversion efficiency(PCE)of 9.77%can be obtained by the devices processed from o-xylene at 40℃,while the DCPIC-EH cannot be processed due to its poor solubility under this condition.Moreover,PCEs of 10.10%for small-area(0.04 cm^(2))devices and nearly 9%for devices with an area of 1 cm^(2) are achieved using a non-halogenated solid additive in o-xylene,realizing the"absolutely halogen-free"OSC fabrication.

关键词： Organic solar cells Non-halogenated solvents double-cable conjugated polymers Long-branched alkyl chains Solubility

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