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Simultaneously optimizing exciton diffusion length and nonradiative energy loss in organic solar cells via ternary strategy

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Science China Chemistry 2024年第9期67卷 3004-3011页

作者： Huanxiang Jiang Hao Lu Zezhou Liang Yonghai Li Guangliu Ran Chenyu Han Yuqiang Liu Hongxiang Li Xichang Bao zhishan bo College of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101China Key Laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi Key Lab of Photonic Technique for InformationSchool of Electronics Science&EngineeringFaculty of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Laboratory of Solar Energy Shandong Energy InstituteQingdao 266101China

Significant nonradiative energy loss and short exciton diffusion length in organic solar cells(OSCs)are two major obstacles to achieving state-of-the-art *** is crucial to conduct a study on the intensive mechanism and improvement strategies for future breakthroughs in the efficiency of *** this work,nonradiative energy loss and exciton diffusion length are optimized simultaneously by incorporating a guest acceptor(LA15)to construct ternary OSC(D18:L8-bo:LA15).Firstly,LA15 exhibits excellent compatibility with the host acceptor L8-bo,and effectively improves the fluorescence quantum efficiency(FLQY),resulting in suppressed non-radiative energy ***,LA15 effectively prolongs the fluorescent lifetime of the acceptor phase from 0.85 to 1.12 ns,leading to larger exciton diffusion length,which is beneficial for reducing geminate ***,the addition of LA15 optimizes the crystallinity of the active layer with amplified charge transport *** a result,the optimized D18:L8-bo:LA15 device achieves ultralow nonradiative energy loss of 0.18 e V and improved fill factor(FF)with high efficiency up to 19.13%.These results highlight the crucial roles of regulating FLQYand exciton lifetime in achieving highefficiency OSCs.

关键词： organic solar cells nonradiative energy loss exciton lifetime exciton diffusion length

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Chlorinated Thiazole-Based Low-Cost Polymer Donors for High Efficiency Binary and Ternary Organic Solar Cells

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CCS Chemistry 2024年第7期6卷 1757-1766页

作者： Hao Lu Hang Wang Guangliu Ran Wenlong Liu Hao Huang Xiaolin Jiang Yahui Liu Xinjun Xu zhishan bo College of Materials Science and Engineering Qingdao UniversityQingdao 266071 College of Textiles&Clothing State Key Laboratory of Bio-Fibers and Eco-TextilesQingdao UniversityQingdao 266071 Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875 Department of Physics and Applied Optics Beijing Area Major Laboratory Beijing Normal UniversityBeijing 100875

In this work,novel D-A alternating polymers(PJ-1,PJ-2,and PJ-3)with chlorinated benzodithiophene and chlorinated thiazole units were synthesized via gradual *** polymers could be obtained readily through a few concise synthesis *** them,PJ-1 displayed desirable properties including energy levels,crystallinity,and charge transport *** binary and ternary organic solar cells(OSCs)fabricated based on PJ-1 displayed significant power conversion efficiency(PCE)of 15.02%and 19.12%,respectively,placing them among the highest reported for ternary ***,the PJ1-based devices also showcased one of the highest figure-of-merit values,indicating their promising potential for future *** study offers valuable insights and supports the development of costeffective and high-performance polymer donors for the generation of OSCs.

关键词： organic solar cells low-cost donor high efficiency low energy loss ternary blend strategy

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Highly efficient solution-processed organic photovoltaics enabled by improving packing behavior of organic semiconductors

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Science China Chemistry 2024年第3期67卷 890-897页

作者： Xinyue Cui Hongxiang Li Hao Lu Yuqiang Liu Guangliu Ran Rui Liu Huarui Zhang Xueqing Ma Dawei Li Yi Lin Jifa Yu Wenkai Zhang Lei Cai Yahui Liu Pei Cheng Andong Zhang Zaifei Ma Guanghao Lu zhishan bo College of Textiles and Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu 610065China Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China Shandong Province Key Laboratory of Medical Physics and Image Processing Technology School of Physics and ElectronicsShandong Normal UniversityJinan 250014China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Frontier Institute of Science and Technology Xi'an Jiaotong UniversityXi'an 710054China

Solution processability is a unique property of organic semiconductors. The compact and regular π-π stacking between molecules is paramount in the performance of organic optoelectronic devices. However, it is still a challenge to improve their stacking quality without sacrificing the solution-processability from the aspect of materials design. Here, delicately engineered additives are presented to promote the formation of ordered aggregation of conjugated molecules by regulating their nucleation and growth dynamics. Intriguingly, the long-chain BTP-eC9-4F molecules can realize ordered aggregation comparable to short-chain ones without sacrificing processability. The domain size of BTP-eC9-4F aggregation is enlarged from 24.2 to 32.2 nm in blend *** exciton diffusion and charge transport become faster, contributing to the suppression of recombination losses. As a result, a power conversion efficiency of 19.2% is achieved in D18:BTP-eC9-4F based organic photovoltaics. Our findings demonstrate a facile strategy to improve the packing quality of solution-processed organic semiconductors for high-efficiency photovoltaics and beyond photovoltaics.

关键词： organic semiconductor organic photovoltaic charge transport solution processability

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Asymmetric molecular engineering in recent nonfullerene acceptors for efficient organic solar cells

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Chinese Chemical Letters 2023年第10期34卷 48-54页

作者： Jinsheng Song zhishan bo Engineering Research Center for Nanomaterials Henan UniversityKaifeng 475004China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China College of Textiles&Clothing Qingdao UniversityQingdao 266071China

Nonfullerene acceptors(NFAs),which usually possess symmetric skeletons,have drawn great attention in recent years due to their pronounced advantages over the fullerene ***,breaking the symmetry of NFAs could fine tune the molecular dipole,solubility,energy level,intermolecular interaction,molecular packing,crystallinity,etc.,and give rise to improved photovoltaic ***,there are three main strategies for the design of asymmetric *** review highlights the recent advances of high-performance asymmetric NFAs and briefly outlooks the materials exploration for the future.

关键词： Asymmetric strategy Organic photovoltaics Nonfullerene acceptor Side chain engineering Y-series acceptors

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High-performance polymer solar cells with >13% efficiency

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Science China Chemistry 2018年第5期61卷 507-508页

作者： zhishan bo College of Chemisty Beijing Normal UniversityBeijing 100875 China

In the last three years,polymer solar cells（PSCs）based on ntype organic semiconductor（n-OS）acceptor have become the focus of attention and made great progress.

关键词： PCE High-performance polymer solar cells with

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Photoinduced excimer generation in perylene diimide dimer:effects of solvent polarity[Invited]

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Chinese Optics Letters 2022年第10期20卷 49-54页

作者： Guangliu Ran Hang Wang Yujing Song Yahui Liu zhishan bo Wenkai Zhang Department of Physics and Applied Optics Beijing Area Major Laboratory Center for Advanced Quantum StudiesBeijing Normal UniversityBeijing 100875China College of Textiles&Clothing Qingdao UniversityQingdao 266071China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China

The aggregation and photoinduced excited state dynamics of organic π-conjugated molecules play a vital role in solar energy conversion and *** work investigates how solvent polarity affects the aggregation behavior and the photophysical process of perylene diimide dimer(PDI-II).The results show that the conjugations between PDI intramolecular chromophores are more likely to generate excimer,and the conjugations between PDI intermolecular chromophores are more likely to experience symmetry-breaking charge *** study can provide a reference for the design of high-efficiency solar energy conversion materials.

关键词： excimer perylene diimide dimer solvent effect transient absorption spectroscopy

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Effect of Polymer Chain Regularity on the Photovoltaic Performance of Organic Solar Cells

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Chinese Journal of Polymer Science 2022年第8期40卷 996-1002,I0012页

作者： Hang Wang Hao Lu Ya-Nan Chen Andong Zhang Yuqiang Liu Cai’e Zhang Yahui Liu Xinjun Xu zhishan bo College of Textiles&Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao266071China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing100875China College of Materials Science and Engineering Shenzhen UniversityShenzhen518060China

In this work,regio-regular and random polymers(reg-PTF and ran-PTF)comprising benzodithiophene and 3-fluorothiophene units are developed to investigate the influence of polymer chain regularity on the photovoltaic ***,reg-PTF exhibits higher HOMO energy level(∼0.2 eV)than that of ran-PTF due to the more ordered molecular structure and higher *** the result,the HOMO energy level offset between donor and acceptor can be well controlled by selecting different *** BTP-ec9-4F with a much deep HOMO energy level as acceptor,reg-PTF-based devices display an inferior PCE of 7.66%compared with ran-PTF based ones(11.78%)due to the too large HOMO energy levels *** blending with Y18-1F,the PCE of reg-PTF-based devices is increased to 13.23%due to the appropriate energy *** comparison,the ran-PTF-based devices nearly do not work because of the negative HOMO energy levels *** work indicates that both the polymer chain regularity and the energy level offset between the donor and acceptor material are important to the performance of organic solar cells.

关键词： Organic solar cells Polymer donor Regio-regular polymer Random polymer Energy level offset

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High-performance nonfused ring electron acceptor with a steric hindrance induced planar molecular backbone

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Science China Chemistry 2022年第3期65卷 594-601页

作者： Hao Lu Xiaodong Wang Hang Wang Andong Zhang Xinming Zheng Na Yu Zheng Tang Xinjun Xu Yahui Liu Ya-Nan Chen zhishan bo College of Textiles&Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdao 266071China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Three nonfused ring electron acceptors (NFREAs) TTC6,TT-C8T and TT-TC8 were purposefully designed and *** molecular geometry can be adjusted by the steric hindrance of lateral *** to the DFT calculations,from TTC6 to TT-C8T and TT-TC8,planarity of the molecular backbone is gradually improved,accompanying with the enhancing of intramolecular charge transfer *** for TT-TC8,the two phenyl substituents are almost perpendicular to the molecular backbone,which endues the acceptor with good solubility and suppresses it to form *** regular molecular orientation and closer molecular stacking are formed in TT-TC8 *** a result,TT-TC8 based devices afford the highest PCE of 13.13%,which is much higher than that of TTC6 (4.41%) and TT-C8T (10.42%) and among the highest PCE values based on NFREAs.

关键词： organic solar cells nonfused ring electron acceptors nonfullerene acceptors steric hindrance

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A Simple Nonfused Ring Electron Acceptor with a Power Conversion Efficiency over 16%

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Chinese Journal of Chemistry 2023年第6期41卷 665-671页

作者： Xiaodong Wang Rui Zeng Hao Lu Guangliu Ran Andong Zhang Ya-Nan Chen Yahui Liu Feng Liu Wenkai Zhang Zheng Tang zhishan bo College of Textiles&Clothing State Key Laboratory of Bio-fibers and Eco-textilesQingdao UniversityQingdaoShandong 266071China Frontiers Science CenterforTransformative Molecules In-situ Centerfor Physical Scienceand Center of Hydrogen Science Schoolof Chemistryand Chemical EngineeringShanghai JiaoTong UniversityShanghai 200240China Departmentof Physics and Applied Optics Beijing Area Major Laboratory Bejing Normal UniversityBeijing 100875China Center for Advanced Low-dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China

By simplifying the r-bridge unit,a nonfused ring electron acceptor(NFREA)BM-2F was designed and synthesized with several high-yield *** specific molecular structure features of BM-2F are planar molecular backbone and out-of-plane side chain,which is favorable for charge transport and can suppress the ***-2F based neat and blend films display obvious face-on molecular ***,D18:BM-2F based blend film can form good bicontinuous interpenetrating *** excitingly,a power conversion efficiency of 16.15%was achieved with D18:BM-2F based photovoltaic devices,which is the highest one based on *** researches manifest that NFREA is a promising direction for low-cost and high-performance organic solar cells.

关键词： Organic solar cells Nonfused ring electron acceptors Nonfullerene acceptors Low-cost acceptors High-performance acceptors

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Evaluating the photovoltaic properties of two conjugated polymers synthesized by Suzuki polycondensation and direct C–H activation

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Science China Chemistry 2015年第2期58卷 286-293页

作者： Hedi Wei Heng Lu Tao Fang zhishan bo Beijing Key Laboratory of Energy Conversion and Storage Materials Key Laboratory of Theoretical and Computational PhotochemistryMinistry of Education College of Chemistry Beijing Normal University

Two conjugated polymers HXS-1 and PDFCDTBT were prepared by direct C–H activation and Suzuki polycondensation and their chemical structures were characterized by 1H NMR *** molecular weight of conjugated polymer synthesized by direct C–H activation is lower than the corresponding polymers prepared by Suzuki *** polymers synthesized by direct C–H activation have considerable solubility in common organic solvents and form amorphous *** photovoltaic property of conjugated polymers synthesized by direct C–H activation is inferior to the corresponding polymers synthesized by Suzuki polycondensation.

关键词： polymer solar cells Suzuki polycondensation direct C-H activation conjugated polymers donor materials

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