检索结果-南通市图书馆

Over 18% binary organic solar cells enabled by isomerization of non-fullerene acceptors with alkylthiophene side chains

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第9期65卷 1758-1766页

作者： Ao Shang Siwei luo Jianquan Zhang Heng Zhao Xinxin Xia Mingao Pan Chao Li Yuzhong Chen Jicheng Yi xinhui lu Wei Ma He Yan Huawei Hu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of Chemistry Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsEnergy Institute and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionHong Kong University of Science and TechnologyClear Water BayKowloonHong Kong 999077China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Department of Physics Chinese University of Hong KongNew TerritoriesHong Kong 999077China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China

Side-chain engineering has been demonstrated as an effective method for fine-tuning the optical,electrical,and morphological properties of organic semiconductors toward efficient organic solar cells(OSCs).In this work,three isomeric non-fullerene small molecule acceptors(SMAs),named as BTP-4F-T2C8,BTP-4F-T2EH and BTP-4F-T3EH,with linear and branched alkyl chains substituted on the α or β positions of thiophene as the side chains,were synthesized and systematically *** results demonstrate that the size and substitution position of alkyl side chains can greatly affect the electronic properties,molecular packing as well as crystallinity of the *** blending with donor polymer D18-Cl,the prominent device performance of 18.25% was achieved by the BTP-4F-T3EH-based solar cells,which is higher than those of the BTP-4F-T2EH-based(17.41%)and BTP-4F-T2C8-based(15.92%)*** enhanced performance of the BTP-4F-T3EH-based devices is attributed to its stronger crystallinity,higher electron mobility,suppressed bimolecular recombination,and the appropriate intermolecular interaction with the donor *** work reveals that the side chain isomerization strategy can be a practical way in tuning the molecular packing and blend morphology for improving the performance of organic solar cells.

关键词： organic solar cells non-fullerene acceptors side chain isomerization morphology intermolecular interaction

Orbital Stability of Peakons for a Generalized Camassa-Holm Equation

在线全文

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2019年第10期7卷 2200-2211页

作者： xinhui lu Aiyong Chen Tongjie Deng Department of Mathematics and Computing Science Guilin University of Electronic Technology Guilin China Department of Mathematics Hunan First Normal University Changsha China

We investigate the orbital stability of the peakons for a generalized Camassa-Holm equation (gCH). Using variable transformation, a planar dynamical system is obtained from the gCH equation. It is shown that the planar system has two heteroclinic cycles which correspond two peakon solutions. We then prove that the peakons for the gCH equation are orbitally stable by using the method of Constantin and Strauss.

关键词： Camassa-Holm Equation Peakon Heteroclinic Orbit Orbital Stability

Green perovskite light-emitting diodes with simultaneous high luminance and quantum efficiency through charge injection engineering

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2020年第21期65卷 1832-1839,M0004页

作者： Tiankai Zhang Mingzhu Long Lingxiang Pan Kwanho Ngai Minchao Qin Fangyan Xie xinhui lu Jian Chen Jianbin Xu Department of Electronic Engineering The Chinese University of Hong KongHong Kong 999077China Department of Physics The Chinese University of Hong KongHong Kong 999077China State Key Laboratory of Optoelectronic Materials and Technologies(Sun Yat-sen University) Guangzhou 510275China

Metal halide perovskite light emitting diodes(PeLEDs)have recently experienced rapid development due to the tunable emission wavelengths,narrow emission linewidth and low material *** achieve stateof-the-art performance,the high photoluminescence quantum yield(PLQY)of the active emission layer,the balanced charge injection,and the optimized optical extraction should be considered *** chemical passivation strategies have been provided as controllable and efficient methods to improve the PLQY of the perovskite ***,high luminance under large injection current and high external quantum efficiency(EQE)can hardly be achieved due to Auger recombination at high carrier ***,we decreased the electron injection barrier by tuning the Fermi-level of the perovskite,leading to a reduced turn on *** molecular doping of the hole injection material,a more balanced hole injection was *** last,a device with modified charge injection realizes high luminance and quantum efficiency *** best device exhibits luminance of 55,000 cd m^-2 EQE of 8.02%at the working voltage of 2.65 V,current density of 115 mA cm^-2,and shows EQE T50 stability around 160 min at 100 mA cm^-2 injection current density.

关键词： Perovskite LED High luminance Structure design Balanced charge injection Molecular doping

Achieving 16.68% efficiency ternary as-cast organic solar cells

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2021年第4期64卷 581-589页

作者： Ruijie Ma Yang Tao Yuzhong Chen Tao Liu Zhenghui luo Yuan Guo Yiqun Xiao Jin Fang Guangye Zhang Xiaojun Li Xia Guo Yuanping Yi Maojie Zhang xinhui lu Yongfang Li He Yan Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration&Reconstruction Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China School of Light Industry and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Department of Physics Chinese University of Hong KongNew TerritoriesHong KongChina Laboratory of Advanced Optoelectronic Materials College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Beijing National Laboratory for Molecular Science Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Hong Kong University of Science and Technology-Shenzhen Research Institute Shenzhen 518057China eFlexPV Limited Flat/RM B12/FHang Seng Causeway Bay BLDGCauseway BayHong KongChina Centre for Mechanical Technology and Automation Department of Mechanical EngineeringUniversity of AveiroAveiroPortugal

State-of-the-art organic solar cells(OSCs)often require the use of high-boiling point additive or post-treatment such as temperature annealing and solvent vapor annealing to achieve the best ***,additives are not desirable in largescale industrial printing process,while post-treatment also increases the production *** this article,we report highly efficient ternary OSCs based on PM6:BTP-Cl Br1:BTP-2O-4Cl-C12(weight ratio=1:1:0.2),with 16.68%power conversion efficiency(PCE)for as-cast device,relatively close to its annealed counterpart(17.19%).Apart from obvious energy tuning effect and complementary absorption spectra,the improved PCE of ternary device is mainly attributed to improved morphological properties including the more favorable materials miscibility,crystallinity,domain size and vertical phase separation,which endorse suppressed *** result of this work provides understanding and guidance for high-performance as-cast OSCs through the ternary strategy.

关键词： organic solar cells as-cast ternary morphology high-performance

Self‑Generated Buried Submicrocavities for High‑Performance Near‑Infrared Perovskite Light‑Emitting Diode

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2023年第8期15卷 355-367页

作者： Jiong Li Chenghao Duan Qianpeng Zhang Chang Chen Qiaoyun Wen Minchao Qin Christopher C.S.Chan Shibing Zou Jianwu Wei Zuo Xiao Chuantian Zuo xinhui lu Kam Sing Wong Zhiyong Fan Keyou Yan School of Environment and Energy State Key Lab of Luminescent Materials and DevicesGuangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou 510000People’s Republic of China Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongPeople’s Republic of China Department of Physics The Chinese University of Hong KongShatinHong KongPeople’s Republic of China Department of Physics The Hong Kong University of Science and TechnologyClear Water BayKowloon 999077Hong KongPeople’s Republic of China School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004People’s Republic of China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People’s Republic of China

ABSTRACT Embedding submicrocavities is an effective approach to improve the light out-coupling efficiency(LOCE)for planar perovskite light-emitting diodes(PeLEDs).In this work,we employ phenethylammonium iodide(PEAI)to trigger the Ostwald ripening for the downward recrystallization of perovskite,resulting in spontaneous formation of buried submicrocavities as light output *** simulation suggests the buried submicrocavities can improve the LOCE from 26.8 to 36.2%for near-infrared ***,PeLED yields peak external quantum efficiency(EQE)increasing from 17.3%at current density of 114 mA cm^(−2)to 25.5%at current density of 109 mA cm^(−2)and a radiance increasing from 109 to 487 W sr^(−1)m^(−2)with low *** turn-on voltage decreased from 1.25 to 1.15 V at 0.1 W sr^(−1)m^(−2).Besides,downward recrystallization process slightly reduces the trap density from 8.90×10^(15)to 7.27×10^(15)cm^(−3).This work provides a self-assembly method to integrate buried output coupler for boosting the performance of PeLEDs.

关键词： Perovskite light-emitting diodes Downward recrystallization Buried submicrocavities Light out-coupling efficiency Radiative recombination

Sulfur vs. tellurium: the heteroatom effects on the nonfullerene acceptors

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2019年第7期62卷 897-903页

作者： Lei Yang Linqing Qin Yunxiao Xu Huotian Zhang Lei Lv Kepeng Chen Xinyu Sui Yangguang Zhong Yuan Guo Feng Gao Jianzhang Zhao Yuhao Li Xinfeng Liu Yuanping Yi xinhui lu Aidong Peng Hui Huang College of Materials Science and Optoelectronic Technology Center of Materials Science and Optoelectronics Engineering CAS Center for Excellence in Topological Quantum Computation CAS Key Laboratory of Vacuum Physic University of Chinese Academy of Sciences Beijing 101408 China Department of Chemical Engineering Imperial College London London SW7 24Z United Kingdom Biomolecular and Organic Electronics Department of Physics Chemistry and Biology (IFM) Linkoping University Linkuping SE-58183 Sweden Division of Nanophotonics CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116024 China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Department of Physics The Chinese University of Hong Kong Shatin NT 999077 Hong Kong China

The effect of chalcogen heteroatom variation on donor materials has been systematically investigated. However, this effect on acceptors has rarely been explored. Herein, nonfullerene acceptors BFPSP and BFPTP were reported by simply changing the chalcogen atoms from S to Te. The differences between BFPSP and BFPTP in light absorption, energy levels, excited-state lifetimes, energy loss, charge mobilities, morphology, and photovoltaic properties were systematically investigated to understand the heteroatom effects. More importantly, the electroluminescence spectra, external quantum efficiency of photovoltaics and TDDFTcalculations revealed that the triplet excited state(T1) in energy of BFPTP equals to the charge transfer(CT) state in PBDBT:BFPTP, which allows T1 excitons, generated by intersystem crossing, to split into free charges to contribute to the *** contribution provides a strategy for tuning the photophysical properties of nonfullerene acceptors and designing high performance triplet materials for OSCs.

关键词： heteroatom effects triplet state tellurophene nonfullerene acceptor organic solar cells

Heteroheptacene-based acceptors with thieno[3,2-b]pyrrole yield high-performance polymer solar cells

在线全文

学校读者我要写书评

暂无评论

National Science Review 2022年第7期9卷 106-115页

作者： Zhenghui luo Ruijie Ma Jianwei Yu Heng Liu Tao Liu Fan Ni Jiahao Hu Yang Zou Anping Zeng Chun-Jen Su U-Ser Jeng xinhui lu Feng Gao Chuluo Yang He Yan Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and EngineeringShenzhen University Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction Hong Kong University of Science and Technology (HKUST) Hong Kong University of Science and Technology-Shenzhen Research Institute Department of Physics Chemistry and Biology (IFM) Link?ping University Department of Physics Chinese University of Hong Kong Synchrotron Radiation Research Center Hsinchu Science Park Department of Chemical Engineering Tsing Hua University Hong Kong University of Science and Technology (HKUST) Light-Emitting Diode and Flat Panel Display Technology Research & Development Center Hong Kong University of Science and Technology (HKUST) Foshan Research Institute for Smart Manufacturing

Rationally utilizing and developing synthetic units is of particular significance for the design of high-performance non-fullerene small-mole cule acceptors(SMAs).Here,a thieno[3,2-b]pyrrole synthetic unit was employed to develop a set of SMAs(ThPy1,ThPy2,ThPy3 and ThPy4) by changing the number or the position of the pyrrole ring in the central core based on a standard SMA of IT-4 Cl,compared to which the four thieno[3,2-b] pyrrole-based acceptors exhibit bathochromic absorption and upshifted frontier orbital energy level due to the strong ele ctron-donating ability of *** a result,the polymer solar cells(PSCs) of the four thieno[3,2-b] pyrrole-based acceptors yield higher open-circuit voltage and lower energy loss relative to those of the IT-4 Cl-based *** is more,the ThPy3-based device achieves a power conversion efficiency(PCE)(15.3%) and an outstanding fill factor(FF)(0.771) that are superior to the IT-4 Cl-based device(PCE=12.6%,FF=0.758).The ThPy4-based device realizes the lowest energy loss and the smallest optical band gap,and the ternary PSC device based on PM6:BTP-eC9:ThPy4 exhibits a PCE of 18.43% and a FF of ***,this work sheds light on the great potential of thieno[3,2-b]pyrrole-based SMAs in realizing low energy loss and high PCE.

关键词： thieno[3,2-b]pyrrole small-molecule acceptors energy loss intramolecular non-covalent interactions polymer solar cells

Highly crystalline acceptor materials based on benzodithiophene with different amount of fluorine substitution on alkoxyphenyl conjugated side chains for organic photovoltaics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Materials Reports(Energy) 2021年第4期1卷 45-53页

作者： Youdi Zhang Ruijie Ma Yong Wang Ying Wang Tao Liu Yiqun Xiao Yongjoon Cho Zhenghui luo xinhui lu lun Zhao Zhongyi Yuan Changduk Yang He Yan Yiwang Chen College of Chemistry Changchun Normal UniversityChangchun130032JilinChina College of Chemistry Nanchang UniversityNanchang330031China Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration&Reconstruction Hong Kong University of Science and Technology(HKUST)Hong KongChina Institute of Polymers and Energy Chemistry(IPEC) Nanchang UniversityNanchang330031China Department of Physics Chinese University of Hong KongHong KongChina Department of Energy Engineering School of Energy and Chemical EngineeringPerovtronics Research CenterLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea

Organic solar cells based on narrow bandgap small-molecule acceptors(SMAs)with highly crystalline characteristics have attracted great attentions for their superiority in obtaining high photovoltaic *** highly crystalline SMAs to enhance power conversion efficiencies(PCEs)by regulating and controlling morphology and compatibility of donor and acceptor materials has turned out to be an effective *** this study,we synthesized three different crystalline SMAs by using fluorine substitution on alkoxyphenyl conjugated side chains to modulate the relationship of crystallinity and morphologies,namely ZY1(zero F atoms),ZY2(two F atoms),and ZY3(four F atoms).The three SMAs show the broad absorption edges and similar frontier orbital energy levels,generating the analogical(over 0.9 V)open circuit voltage(VOC)of the polymer solar cells(PSCs).As a result,the PM6:ZY2-based PSCs yield a PCE of 10.81%with a VOC of 0.95 V,a short-circuit current density(JSC)of 16.154 mA cm^(-2),and a fill factor(FF)of 0.71,which is higher than that of 9.17%(PM6:ZY1)and 6.37%(PM6:ZY3).And the PCE(17.23%)of the PM6:Y6:ZY2 based ternary PSCs is also higher than that of 16.32%PM6:Y6 based binary ***,the results demonstrate that adding fluorine atoms on the conjugated side chains to construct high crystalline materials is a positive strategy to effectively increase the efficiencies of binary and ternary PSCs.

关键词： Organic solar cells Small molecular acceptors Fluorine substitution Highly crystalline acceptors Nonfullerene polymer solar cells

基于首超准则的随机车流下悬索桥加劲梁动力可靠度评估

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中南大学学报（自然科学版） 2016年第10期47卷 3491-3497页

作者：肖新辉鲁乃唯刘扬郭鑫长沙理工大学土木与建筑学院湖南长沙410114 长沙理工大学桥梁结构安全控制湖南省工程实验室湖南长沙410114 长沙理工大学交通科学研究院湖南长沙410114

为了研究考虑车辆运行状态的大跨度悬索桥加劲梁动位移概率特征及桥梁运营期的安全水平,基于实测车流数据和动力可靠度理论分析悬索桥加劲梁在运营期内车致响应的动力可靠度。建立考虑车辆占有率的桥梁动力可靠度数学模型,分析主跨为82... 详细信息

为了研究考虑车辆运行状态的大跨度悬索桥加劲梁动位移概率特征及桥梁运营期的安全水平,基于实测车流数据和动力可靠度理论分析悬索桥加劲梁在运营期内车致响应的动力可靠度。建立考虑车辆占有率的桥梁动力可靠度数学模型,分析主跨为820 m的悬索桥在运营期内稀疏运行车辆和密集运行车辆作用下的加劲梁位移动力可靠度。研究结果表明:在随机车流作用下,悬索桥加劲梁在1/4跨节点的位移动力响应均方根最大,且加劲梁位移的界限跨越率随车辆样本数量的增大趋于稳定;在100 a内,实际运行状态下的动力可靠指标由5.92降至5.11,介于密集运行状态与稀疏运行状态之间;在不考虑桥梁抗力退化的情况下,随机车流作用下悬索桥加劲梁位移超限失效事件主要由密集运行车辆引起,但随着密集运行车辆的增大,可靠指标下降趋势减缓。

关键词：桥梁工程悬索桥动力可靠度随机车流响应均方根