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Non-fullerene acceptor pre-aggregates enable high efficiency pseudo-bulk heterojunction organic solar cells

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Science China Chemistry 2022年第2期65卷 373-381页

作者： Donghui Li Chuanhang Guo Xue Zhang baocai du Cong Yu Pang Wang Shili Cheng Liang Wang Jinlong Cai Hui Wang Dan Liu Huifeng Yao Yanming Sun Jianhui Hou Tao Wang School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Chemistry Beihang UniversityBeijing 100191China

Pseudo-bulk heterojunction(BHJ)fabricated by sequential casting of donor and acceptor layers has been recently demonstrated as a superior structure to prepare organic solar cells(OSCs)with enhanced efficiency compared to the conventional BHJ OSCs cast from a common solution of donors and ***,molecular diffusion and aggregation within the pseudo-BHJ layer bring great challenges to fully realize the advantage of pseudo-BHJ ***,a solution-incubated pre-aggregation strategy is employed to tune the nanoscale aggregates of non-fullerene acceptor(NFA)BTP-e C11 and N3 to substantially enhance device power-conversion efficiency(PCE).NFA pre-aggregates are incubated in solutions via aging or adding antisolvent,and then sequentially cast onto D18 fibrillar network,which then penetrate to form a pseudo-BHJ structure with appropriate domain sizes to ensure superior charge *** the conventional pseudo-BHJ OSCs obtain inferior PCEs below 17%compared with normal BHJ OSCs,NFA pre-aggregates help to achieve remarkable PCEs of 17.7%and 17.5%for D18/BTP-e C11 and D18/N3 pseudo-BHJ *** work demonstrates that the solution-incubated nanoscale pre-aggregation is an efficient approach to regulate molecular diffusion and aggregation to guarantee high performance pseudo-BHJ OSCs.

关键词： non-fullerene acceptors pre-aggregate pseudo-bulk heterojunction organic solar cells

Heating-induced aggregation control for efficient sequential-cast organic solar cells

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Aggregate

Aggregate 2022年第3期3卷 19-26页

作者： Donghui Li Chuanhang Guo Xue Zhang baocai du Pang Wang Shili Cheng Jinlong Cai Hui Wang Dan Liu Huifeng Yao Jianhui Hou Tao Wang School of Materials Science and Engineering Wuhan University of TechnologyWuhanChina State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina

The aggregation and morphology within the photoactive layer is of considerable significance to boost the power-conversion efficiency(PCE)of organic solar cells(OSCs).Herein,heating-induced aggregation control of nonfullerene acceptor BTPeC7 during sequential casting was *** large aggregates of BTP-eC7 can be significantly reduced by sequential casting of BTP-eC7 hot solution on the D18 fibrillar layer,and further eliminated by sequential casting of BTP-eC7 hot solution on the D18 fibrillar layer heated on hot substrate,leading to stronger faceonπ–πstacking and appropriate phase separation within the photoactive layer to promote exciton dissociation and charge *** maximum PCE of D18/BTPeC7 solar cells can be enhanced from 8.1%of room temperature casting to 15.9%of hot solution,hot-substrate casting,therefore demonstrates that heating-induced aggregation and sequential-casting strategies are a promising approach in improving the performance of OSCs employing nonfullerene acceptors with limited solubility or strong crystallization ability.

关键词： aggregation heating nonfullerene acceptors organic solar cells sequentialcast

Regulating the morphology of fluorinated non-fullerene acceptor and polymer donor via binary solvent mixture for high efficiency polymer solar cells

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Science China Chemistry 2019年第9期62卷 1221-1229页

作者： Mengxue Chen Zhuohan Zhang Wei Li Jinlong Cai Jiangsheng Yu Emma L. K. Spooner Rachel C. Kilbride Donghui Li baocai du Robert S. Gurney Dan Liu Weihua Tang David G. Lidzey Tao Wang School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan 430070 China School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 China Department of Physics and Astronomy University of Sheffield Sheffield S3 7RH UK

Fluorinated non-fullerene acceptors(NFAs) usually have planar backbone and a higher tendency to crystallize compared to their non-fluorinated counterparts, which leads to enhanced charge mobility in organic solar cells(OSCs). However, this selforganization behavior may result in excessive phase separation with electron donors and thereby deteriorate device ***, we demonstrate an effective approach to tune the molecular organization of a fluorinated NFA(INPIC-4 F), and its phase separation with the donor PBDB-T, by varying the casting solvent. A prolonged film drying time encourages the crystallization of INPIC-4 F into spherulites and consequently results in excessive phase separation, leading to a low device power conversion efficiency(PCE) of 8.1%. Contrarily, a drying time leads to fine mixed domains with inefficient charge transport properties,resulting in a moderate device PCE of 11.4%. An intermediate film drying time results in the formation of face-on π-π stacked PBDB-T and INPIC-4 F domains with continuous phase-separated networks, which facilitates light absorption, exciton dissociation as well as balanced charge transport towards the electrode, and achieves a remarkable PCE of 13.1%. This work provides a rational guide for optimizing the molecular ordering of NFAs and electron donors for high device efficiency.

关键词： organic solar cells non-fullerene acceptors solvent morphology efficiency

Non-fullerene acceptor fibrils enable efficient ternary organic solar cells with 16.6% efficiency

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Science China Chemistry 2020年第10期63卷 1461-1468页

作者： Donghui Li Xiaolong Chen Jinglong Cai Wei Li Mengxue Chen Yuchao Mao baocai du Joel A.Smith Rachel C.Kilbride Mary E.O'Kane Xue Zhang Yuan Zhuang Pang Wang Hui Wang Dan Liu Richard A.L.Jones David G.Lidzey Tao Wang School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Department of Physics and Astronomy University of SheffieldSheffield.S37RHUK

Optimizing the components and morphology within the photoactive layer of organic solar cells(OSCs)can significantly enhance their power conversion efficiency(PCE).A new A-D-A type non-fullerene acceptor IDMIC-4F is designed and synthesized in this work,and is employed as the third component to prepare high performance ternary solar ***-4F can form fibrils after solution casting,and the presence of this fibrillar structure in the PBDB-T-2F:BTP-4F host confines the growth of donors and acceptors into fine domains,as well as acting as transport channels to enhance electron *** junction ternary devices incorporating 10 wt%IDMIC-4F exhibit enhanced light absorption and balanced carrier mobility,and achieve a maximum PCE of 16.6%compared to 15.7%for the binary device,which is a remarkable efficiency for OSCs reported in *** non-fullerene acceptor fibril network strategy is a promising method to improve the photovoltaic performance of ternary OSCs.

关键词： ternary solar cells non-fullerene acceptor fibrils power conversion efficiency

Rice Brittleness Mutants: A Way to Open the ‘Black Box’ of Monocot Cell Wall Biosynthesis

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Journal of Integrative Plant Biology 2011年第2期53卷 136-142页

作者： baocai Zhang Yihua Zhou State Key Laboratory of Plant Genomics and National Center for Plant Gene Research Institute of Genetics and Developmental Biologythe Chinese Academy of Sciences Beijing 100101 China

Rice is a model organism for studying the mechanism of cell wall biosynthesis and remolding in Gramineae. Mechanical strength is an important agronomy trait of rice （Oryza sativa L.） plants that affects crop lodging and grain yield. As a prominent physical property of cell walls, mechanical strength reflects upon the structure of different wall polymers and how they interact. Studies on the mechanisms that regulate the mechanical strength therefore consequently results in uncovering the genes functioning in cell wall biosynthesis and remodeling. Our group focuses on the study of isolation of brittle culm （bc） mutants and characterization of their corresponding genes. To date, several bc mutants have been reported. The identified genes have covered several pathways of cell wall biosynthesis, revealing many secrets of monocot cell wall biosynthesis. Here, we review the progress achieved in this research field and also highlight the perspectives in expectancy. All of those lend new insights into mechanisms of cell wall formation and are helpful for harnessing the waste rice straws for biofuel production.

关键词： RICE BRITTLENESS MONOCOTYLEDONS PLANT cell walls BIOSYNTHESIS ENERGY crops CELLULOSE

Comments on National guidelines for diagnosis and treatment of pancreatic cancer 2022 in China(English version)

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Chinese Journal of Cancer Research 2022年第6期34卷 637-643页

作者： Kemin Jin baocai Xing Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Department of Hepatobiliary and Pancreatic Surgery UnitⅠPeking University Cancer Hospital&InstituteBeijing 100142China

Pancreatic cancer is a serious threat to human health,and the incidence is on the *** to lack of obvious symptoms in early stage,it is often diagnosed in late *** biological behavior is poor,and up to now,surgery and ... 详细信息

关键词： diagnosis cancer effect

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区域敏感的场景图生成方法

北京工业大学学报 2025年第01期51卷 51-58页

作者：王立春付芳玉徐凯徐洪波尹宝才北京工业大学信息学部北京工业大学多媒体与智能软件技术北京市重点实验室

针对基于关系边界框提取的谓词特征粒度相对较粗的问题，提出区域敏感的场景图生成(region-sensitive scene graph generation, RS-SGG)方法。谓词特征提取模块将关系边界框分为4个区域，基于自注意力机制抑制关系边界框中与关系分类无... 详细信息

针对基于关系边界框提取的谓词特征粒度相对较粗的问题，提出区域敏感的场景图生成(region-sensitive scene graph generation, RS-SGG)方法。谓词特征提取模块将关系边界框分为4个区域，基于自注意力机制抑制关系边界框中与关系分类无关的背景区域。关系特征解码器在进行关系预测时不仅考虑了物体对的视觉特征和语义特征，也考虑了物体对的位置特征。在视觉基因组(visual genome, VG)数据集上分别计算了RS-SGG方法针对场景图生成、场景图分类和谓词分类3个子任务的图约束召回率和无图约束召回率，并与主流的场景图生成方法进行了比较。实验结果表明，RS-SGG的图约束召回率和无图约束召回率均优于主流方法。此外，可视化实验结果也进一步证明了所提出方法的有效性。

关键词：图像理解场景图生成物体分类关系分类区域感知自注意力机制

Genetic Contribution of Paleopolyploidy to Adaptive Evolution in Angiosperms

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Molecular Plant 2020年第1期13卷 59-71页

作者： Shengdan Wu baocai Han Yuannian Jiao State Key Laboratory of Systematic and Evolutionary Botany Institute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China

Ancient whole-genome duplications (WGDs or polyploidy) are prevalent in plants, and some WGDs occurred during the timing of severe global environmental changes. It has been suggested that WGDs may have contributed to plant adaptation. However, this still lacks empirical evidence at the genetic level to support the hypothesis. Here, we investigated the survivors of gene duplicates from multiple ancient WGD events on the major branches of angiosperm phylogeny, and aimed to explore genetic evidence supporting the significance of polyploidy. duplicated genes co-retained from three waves of independent WGDs (～120 million years ago [Ma], ～66, and duplicates after the eight independently occurring WGDs in many lineages around the Cretaceous-Paleocene boundary, when the global cooling and darkness were the two main stresses. Moreover, the commonly retained duplicates could be key factors which may have contributed to the robustness of the critical stress-related pathways. In addition, genome-wide transcription factors (TFs) functioning in stresses tend to retain duplicates after waves of WGDs, and the coselected gene duplicates in many lineages may play critical roles during severe environmental stresses. Collectively, these results shed new light on the significant contribution of paleopolyploidy to plant adaptation during global environmental changes in the evolutionary history of angiosperms.

关键词： whole-genome duplication paleopolyploidy adaptive evolution phylogenomic Cretaceous-Paleocene boundary gene regulatory network

The plant cell wall: Biosynthesis, construction, and functions

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Journal of Integrative Plant Biology 2021年第1期63卷 251-272页

作者： baocai Zhang Yihong Gao Lanjun Zhang Yihua Zhou State Key Laboratory of Plant Genomics Institute of Genetics and Developmental BiologyThe Innovative Academy of Seed DesignChinese Academy of SciencesBeiing 100101China University of Chinese Academy of Sciences Bejig 100049China

The plant cell wall is composed of multiple biopolymers, representing one of the most complex structural networks in nature. Hundreds of genes are involved in building such a natural masterpiece. However, the plant cell wall is the least understood cellular structure in plants. due to great progress in plant functional genomics,manyachievementshavebeenmadein uncovering cell wall biosynthesis, assembly, and architecture, as well as cell wall regulation and signaling. Such information has significantly advanced our understanding of the roles of the cell wall in many biological and physiological processes and has enhanced our utilization of cell wall materials. The use of cutting-edge technologies such as single-molecule imaging,nuclear magnetic resonance spectroscopy, and atomic force microscopy has provided much insight into the plant cell wall as an intricate nanoscale network, opening up unprecedented possibilities for cell wall research. In this review,we summarize the major advances made in understanding the cell wall in this era of functional genomics, including the latest findings on the biosynthesis, construction, and functions of the cell wall.

关键词： biosynthesis cell wall construction function