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Self-assembly of chiral amphiphiles with π-conjugated tectons

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Chinese Science Bulletin 2012年第33期57卷 4246-4256页

作者： HUANG Yongwei wei zhixiang Medical College Henan UniversityKaifeng 475004China National Center for Nanoscience and Technology Beijing 100190China Institute of Environmental Medicine Henan UniversityKaifeng 475004China

Self-assembly of chiral amphiphiles with π-conjugated tectons into one-dimensional helical nanostructures offers great potential applications in the biological,physical,and material *** this review,the recent development of supramolecular self-assembly of chiral amphiphiles with π-conjugated tectons has been discussed on the basis of experimental exploration by elegantly utilizing cooperative noncovalent forces such as π-π stacking,hydrophobic interaction,hydrogen bond and electrostatic interaction,and the potential applications of these self-assembled helical nanostructures in chiral recognition,asymmetric catalysis,electrical conduction,switchable interfaces and soft template for the fabrication of one-dimensional hard materials are described by a representative ***,some scientific and technical challenges in the development of supramolecular self-assembly of chiral amphiphiles with π-conjugated tectons are also *** is hoped that this review can summarize the strategies for self-assembling soft nanomaterials by using chiral amphiphiles with π-conjugated tectons,and also as a guideline for design functional nanomaterials for various potential applications.

关键词：超分子自组装手性识别共轭双亲静电相互作用纳米结构材料科学不对称催化

Halogenated thiophene substitutions on quinoxaline unit to achieve morphology optimization in efficient organic solar cells

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Nano Research 2023年第9期16卷 11630-11637页

作者： Dingding Qiu Jianqi Zhang Kun Lu zhixiang wei CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing 100190China Sino-Danish Center for Education and Research Sino-Danish CollegeUniversity of Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Halogenated thiophenes are generally used units for constructing organic semiconductor materials for photovoltaic ***,we introduced thiophene,2-bromothiophene,and 2-chlorothiophene units to the central core of quinoxaline-based acceptors and obtained three acceptors,Qx-H,Qx-Br,and Qx-Cl,*** with Qx-H,Qx-Br and Qx-Cl showed enhanced absorption,down-shifted energy levels,improved crystallinity,and reduced energy *** improved crystallinity significantly optimized the blend morphology,leading to efficient charge generation and transport and,therefore,less bimolecular ***,PM6:Qx-Br-based devices exhibited an outstanding power conversion efficiency of 17.42%with a high open-circuit voltage(VOC)of 0.915 ***,Y6 was introduced into the PM6:Qx-Br binary system to improve the light utilization,and the resulting ternary devices delivered a high PCE of 18.36%.This study demonstrated the great potential of halogenated thiophene substitution in quinoxaline-based acceptors for building high-performance organic solar cell acceptor materials.

关键词： halogenated thiophene units non-fullerene acceptors organic solar cells quinoxaline acceptors morphology optimization

Self-assembly of conjugated polymers for anisotropic nanostructures

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Science China Chemistry 2012年第11期55卷 2283-2291页

作者： YU Zai LU Kun wei zhixiang National Center for Nanoseience and Technology Beijng 100190China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China

As their potential applications in various electronic devices increase, the preparation of anisotropic conjugated polymer nanostructures are highly desirable. This paper presents a review of the literature and our recent results on the self-assembly of one-, two- and three-dimensional anisotropic nanostructures using conjugated polymers as building blocks, including the formation of one-dimensional (1D) nanofibers and nanotubes, two-dimensional (2D) nanoribbons and nanosheets, and three-dimensional (3D) superstructures. The mechanisms guiding the formation of various nanostructures are analyzed by a cooperative effect of - stacking interaction and other noncovalent interactions.

关键词： conjugated polymer self-assembly nanostructures anisotropic mechanism

An A-D-A′-D-A type unfused nonfullerene acceptor for organic solar cells with approaching 14%efficiency

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Science China Chemistry 2021年第2期64卷 228-231页

作者： Xingzheng Liu Yanan wei Xin Zhang Linqing Qin zhixiang wei Hui Huang College of Materials Science and Opto-Electronic Technology Center of Materials Science and Optoelectronics EngineeringCAS Center for Excellence in Topological Quantum ComputationCAS Key Laboratory of Vacuum PhysicUniversity of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

In recent years,power conversion efficiency(PCE)of organic solar cells(OSCs)has made significant improvement.A large number of studies were reported to achieve high PCEs through exploring new active layer materials,especially the high efficiency fused ring acceptors(FRAs).Compared with FRAs,another type of so-called unfused-ring acceptors(UFAs),possessing some advantages such as simple synthesis and low cost,have attracted a lot of ***,a new UFA BTzO-4F,incorporating with a benzotriazole moiety and S···O intramolecular noncovalent interactions,has been successfully *** photovoltaic device based on PBDB-T:BTzO-4F achieved a record PCE of 13.8%for UFAs,which indicates that introducing the benzotriazole moiety is an effective strategy for high quality ***,these findings of this work demonstrate the great potential of UFAs for high performance OSCs.

关键词： organic solar cells unfused nonfullerene acceptor benzotriazole moiety

Modulating the Helicity of Sugar-Substituted Perylene Diimide Self-assemblies by Solvent Polarilities

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Chinese Journal of Chemistry 2015年第1期33卷 95-100页

作者： Qiang Guo Junchao Wang Lingyun Zhu zhixiang wei National Center for Nanoscience and Technology Beijing 10190China University of Chinese Academy of Sciences Beijing 100049China

Modulating the helicity of self-assemblies of conjugated molecules is important for their application in chiral *** this communication,solvent effect has been investigated on how to modulate the helicity of supramolecular assemblies of sugar-substituted perylenediimide(PTCDI-BAG)by using UV-Vis,circular dichroism spectroscopy and transmission electron ***-handed helical nanowires are obtained in the mixed solvent system of both N,N-dimethylformamide/ethanol(DMF/ethanol)and N,N-dimethylacetamide/ethanol(DMAC/ethanol).As changing the solvents into dimethyl sulfoxide/ethanol(DMSO/ethanol),ethylene glycol/ethanol(EG/ethanol),or N-methyl-2-pyrrolidone/ethanol(NMP/ethanol),only right-handed heical nanowires are *** chirality of supramolecular structures can be tuned by the controlling of the polarity of the solvents.A theoretical calculation is carried out to explain the chiral optical inversion phenomena of PTCDI-BAG aggregates in different solvents,which reveals that reversed CD spectra is due to the difference of clockwise and anticlockwise rotation of the dimer.

关键词： self-assembly solvent effect helicity conjugated molecules nanowire

Slot-die coated large-area flexible all-polymer solar cells by nonhalogenated solvent

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Nano Research 2023年第12期16卷 13008-13013页

作者： Yi-Fan Shen Jianqi Zhang Chenyang Tian Dingding Qiu zhixiang wei CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Sino-Danish Center for Education and Research Sino-Danish CollegeUniversity of Chinese Academy of SciencesBeijing 100049China

The slot-die coating is recognized as the most compatible method for the roll-to-roll(R2R)processing of large-area flexible organic solar cells(OSCs).However,the photovoltaic performance of the large-area flexible all-polymer solar cells was significantly lagging behind that of polymer donors with small molecule non-fullerene acceptors *** this work,the 1 cm^(2) flexible device of an all-polymer system,PTQ10:PYF-T-o,fabricated by slot-die coating,achieves an excellent efficiency of 11.24%via controlling the coating *** is found that,compared with the donor,the crystallinity of PYF-T-o plays a crucial role in device *** all-polymer flexible devices show superior mechanical bending stability,maintaining an efficiency of over 95%of the initial value during a 1000-cycle bending test.

关键词： organic solar cells slot-die coating non-halogenated solvent flexible large-area devices morphology control

Semitransparent Flexible Organic Solar Cells

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Chemical Research in Chinese Universities 2020年第3期36卷 343-350页

作者： WANG Yuhcng CHANG Yilin ZHANG Jianqi LU Guanghao wei zhixiang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190P.R.China Frontier Institute of Science and Technology Xi'an Jiaotong UniversityXi'an 710054P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China

The semitransparent flexible organic solar cell takes advantages of flexibility,transparency,color adjust ment property,which is more conducive to integrate on buidings and mobile *** to the developments of narrow band gap donors and the new non-fullerene acceptors,the power conversion efficiency of semitransparent flexible organic solar cells has been achieved 10% to 12% with average visible transmittance of 17% to 21%.This review summarizes the molecular design of the most representative layer materials,and discusses the characterization of semitransparent parameters paradigms,then we discuss how to optimize the device in combination with optical simulation,and finally list the recent development of semitransparent flexible electrodes of ITO-free organic solar cells,and give our perspectives on the next step direction.

关键词： Semitransparent Flexible Organic solar cell Electrode Optical simulation

Oligomeric donor with appropriate crystallinity for organic solar cells

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Chinese Chemical Letters 2024年第2期35卷 289-294页

作者： Kaiming Yang Min Lv Yanhong Chang Kun Lu zhixiang wei CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Environmental Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource Treatment of Typical Industrial Pollutants Beijing 100083China

Improving the performance of all-small-molecule organic solar cells(ASM-OSCs)largely depends on the design and application of novel donors with appropriate *** molecular conjugation is an effective method for regulating molecular stacking and *** this work,we successfully designed and synthesized two novel acceptor-donor-donor-donor-acceptor(A-D-D-D-A)type oligomeric donors with three dithieno[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b']dithiophene(DTBDT)as the central unit,named as 3DTBDT-Cl and 3DTBDT,depending on with and without chlorine substitution on the thiophene side *** found that the introduction of chlorine atoms makes the blend films display stronger crystallinity but with large-scale phase separation morphology and more defects,which eventually leads to a power conversion efficiency(PCE)of only 10.83%,whereas the blend films based 3DTBDT with appropriate crystallinity achieved 13.74%*** with 3DTBDT-Cl/L8-BO,the 3DTBDT/L8-BO films exhibited a nanoscale bi-continuous interpenetrating network morphology with a smaller domain size and more suitable crystallinity,which guarantees the corresponding devices obtained more efficient exciton dissociation,efficient charge transport,reduced bimolecular recombination,and performed more balanced carrier *** results demonstrated that regulating the crystallinity of oligomeric donors to obtain the desired phase separation morphology in the blend films could facilitate further improving the performance of ASM-OSCs.

关键词： Linked donor unit Oligomeric donors Crystallinity regulation Organic solar cells

A review of the mechanical integrity and electrochemical performance of flexible lithium-ion batteries

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Nano Research 2023年第12期16卷 12962-12982页

作者： Ahmad Shokrieh Amir Hossein Mirzaei Lijuan Mao Mahmood M.Shokrieh zhixiang wei CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing 100190China Composites Research Laboratory Center of Excellence in Experimental Solid Mechanics and DynamicsSchool of Mechanical EngineeringIran University of Science and TechnologyTehran 16846-13114Iran University of Chinese Academy of Sciences Beijing 100049China

In the past two decades,various research works have been conducted in the field of flexible electronic devices(FEDs).Researchers have focused their efforts on solving the existing challenges in the electronic,electrochemical,and mechanical behaviors of *** importance of flexible lithium-ion batteries(FLIBs)in the area of FEDs is evident;however,less attention has been paid to the mechanical behavior of FLIBs in comparison with the material and electrochemical *** present paper reviewed the research works in the FLIBs,focusing on their mechanical integrity and electrochemical ***,an introduction to FLIBs was presented,and the previous review papers published in this field were briefly ***,a detailed review of the available electrochemical and mechanical research works on FLIBs was ***,the mechanical testing methods(tensile,compressive,indentation,fatigue,and adhesion)for the characterization of FLIBs’components,the research works on the simulation and modeling of the mechanical behavior of FLIBs,and a summary of the present situation and the future trend of research in this field were reviewed and presented.

关键词： flexible devices electrochemical performance mechanical integrity testing methods simulation and modeling.