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Critical Role of molecular Electrostatic Potential on Charge Generation in Organic Solar Cells

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chinese Journal of chemistry 2018年第6期36卷 491-494页

作者： Huifeng Yao Deping Qian Hao Zhang Yunpeng Qin Bowei Xu Yong Cui Runnan Yu Feng gao Jianhui Hou beijing National laboratory for molecular sciences State Key Laboratory of Polymer Physics and Chemistry CAS Research/Education Center for Excellence in Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Department of physics Chemistry and Biology (IFM) Linkoping University Linkoping 58183 Sweden University of chinese academy of sciences Beijing 100049 China

Revealing the charge generation is a crucial step to understand the organic photovoltaics. Recent development in non-fullerene organic solar cells （OSCs） indicates efficient charge separation even with negligible energetic offset between the donor and acceptor materials. These new findings trigger a critical question concerning the charge separation mechanism in OSCs, traditionally believed to result from sufficient energetic offset between the polymer donor and fullerene acceptor. We propose a new mechanism, which involves the molecular electrostatic potential, to explain efficient charge separation in non-fullerene OSCs. Together with the new mechanism, we demonstrate a record efficiency of -12% for systems with negligible energetic offset between donor and acceptor materials. Our analysis also rationalizes different requirement of the energetic offset between fullerene-based and non-fullerene OSCs, and paves the way for further design of OSC materials with both high photocurrent and high photovottage at the same time.

关键词： organic solar cells non-fullerene acceptor molecular electrostatic potential exciton dissociation

Bacterial Cellulose Composite Solid polymer Electrolyte With High Tensile Strength and Lithium Dendrite Inhibition for Long Life Battery

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Energy & Environmental Materials 2021年第3期4卷 434-443页

作者： Yuhan Li Zongjie Sun Dongyu Liu Shiyao Lu Fei Li Guoxin gao Min Zhu Mingtao Li Yanfeng Zhang Huaitian Bu Zhiyu Jia Shujiang Ding Department of Applied chemistry School of ChemistryXi’an Key Laboratory of Sustainable Energy Materials ChemistryMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China International Research center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Materials and Nanotechnology SINTEF IndustryForskningsveien 1Oslo 0373Norway School of chemistry and Chemical Engineering MOE Key Laboratory of Cluster ScienceBeijing Institute of TechnologyBeijing 100081China

The development of metallic lithium anode is restrained by lithium dendrite growth during *** solid polymer electrolyte with high mechanical strength and lithium ion conductivity could be applied to inhibit lithium dendrite *** prepare the high-performance solid polymer electrolyte,the environment-friendly and cheap bacterial cellulose(BC)is used as filler incorporating with PEO-based electrolyte owing to good mechanical properties and Li salts ***/Li TFSI/BC composite solid polymer electrolytes(CSPE)are prepared easily by aqueous mixing in *** lithium ion transference number of PEO/Li TFSI/BC CSPE is 0.57,which is higher than PEO/Li TFSI solid polymer electrolyte(SPE)(0.409).The PEO/Li TFSI/BC CSPE exhibits larger tensile strength(4.43 MPa)than PEO/Li TFSI SPE(1.34 MPa).The electrochemical window of composite electrolyte is widened 1.43 V by adding *** functional theory calculations indicate that flex of PEO chains around Li atoms is suppressed,suggesting the enhanced lithium ion *** molecular orbitals results suggest that an unfavorable intermolecular charge transfer lead to achieve higher potential for BC composite *** solid-state Li metal battery with PEO/Li TFSI/BC CSPE delivers longer cycle life for 600 cycles than PEO/Li TFSI SPE battery(50 cycles).Li symmetrical battery using PEO/Li TFSI/BC CSPE could be stable for 1160 h.

关键词： all solid-state battery bacterial cellulose composite polymer electrolyte DFT calculations HOMO and LUMO

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Quantitative evaluation of space charge effects of laser-cooled three-dimensional ion system on a secular motion period scale

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chinese physics B 2018年第4期27卷 292-298页

作者： Li-Jun Du Hong-Fang Song Shao-Long Chen Yao Huang xin Tong Hua Guan Ke-Lin gao china academy of Space Technology (xi'an) Xi'an 710100 China state key laboratory of Magnetic Resonance and Atomic and molecular physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China key laboratory of Atomic Frequency Standards Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China center for Cold Atom physics Chinese Academy of Sciences Wuhan 430071 China University of chinese academy of sciences Beijing 100049 China

In this paper,we introduce a method of quantitatively evaluating and controlling the space charge effect of a lasercooled three-dimensional（3 D） ion system in a linear Paul *** relationship among cooling efficiency,ion quantity,and trapping strength is analyzed quantitatively,and the dynamic space distribution and temporal evolution of the 3 D ion system on a secular motion period time scale in the cooling process are *** ion number influences the eigen-micromotion feature of the ion *** trapping parameter q is ～ 0.3,relatively ideal cooling efficiency and equilibrium temperature can be *** decrease of axial electrostatic potential is helpful in reducing the micromotion heating effect and the degradation in the total *** a single secular motion period under different cooling conditions,ions transform from the cloud state（each ion disperses throughout the envelope of the ion system） to the liquid state（each ion is concentrated at a specific location in the ion system） and then to the crystal state（each ion is subjected to a fixed motion track）.These results are conducive to long-term storage and precise control,motion effect suppression,high-efficiency cooling,and increasing the precision of spectroscopy for a 3 D ion system.

关键词： space charge effects cooling dynamics ion trajectory ion energy

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Host-Guest Strategy Enabling Nonhalogenated Solvent Processing for High-Performance All-polymer Hosted Solar Cells

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chinese Journal of chemistry 2023年第9期41卷 1066-1074页

作者： Yuting Huang Haiyang Chen Qunping Fan Ziyuan Chen Junyuan Ding Heyi Yang Zhe Sun Rui Zhang Weijie Chen Changduk Yang Feng gao Yaowen Li laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China Jiangsu key laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhouJiangsu 215123China state and Local Joint Engineering laboratory for Novel Functional polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China state key laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'anShaanxi 710049China Department of Energy Engineering School of Energy and Chemical EngineeringPerovtronics Research CenterLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)UlsanRepublic of Korea Department of physics Chemistry and Biology(IFM)Linkoping UniversityLinkopingSweden

The power conversion efficiencies(PCEs)of all-polymer solar cells(all-PSCs),usually processed from low-boiling-point and toxic sol-vents,have reached high values of 18%.However,poor miscibility and uncontrollable crystallinity in polymer blends lead to a nota-ble drop in the PCEs when using green solvents,limiting the practical development of ***,a third component(guest)BTO was employed to optimize the miscibility and enhance the crystallinity of PM6/PY2Se-F host film processed from green solvent toluene(TL),which can effectively suppress the excessive aggregation of PY2Se-F and facilitate a nano-scale interpenetrating net-work morphology for exciton dissociation and charge *** a result,TL-processed all-polymer hosted solar cells(all-PHSCs)exhibited an impressive PCE of 17.01%.Moreover,the strong molecular interaction between the host and guest molecules also en-hances the thermal stability of the *** host-guest strategy provides a unique approach to developing high-efficiency and stable all-PHSCs processed from green solvents,paving the way for the industrial development of all-PHSCs.

关键词： All-polymer solar cells Host-guest systems Crystal engineering Nonhalogenated green solvent Stability Morphology Miscibility Ternary blend solar cells

Macroscopic assembled graphene nanofilms based room temperature ultrafast mid-infrared photodetectors

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InfoMat 2022年第6期4卷 129-140页

作者： Li Peng Lixiang Liu Sichao Du Srikrishna Chanakya Bodepudi Lingfei Li Wei Liu Runchen Lai xiaoxue Cao Wenzhang Fang Yingjun Liu xinyu Liu Jianhang Lv Muhammad Abid Junxue Liu Shengye jin Kaifeng Wu Miao-Ling Lin xin Cong Ping-Heng Tan Haiming Zhu Qihua xiong xiaomu Wang Weida Hu xiangfeng Duan Bin Yu Zhen Xu Yang Xu Chao gao MOE key laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringInternational Research Center for X PolymersZhejiang UniversityHangzhouChina School of Micro-nanoelectronics State Key Laboratory of Silicon MaterialsHangzhou Global Scientific and Technological Innovation CenterZJU-UIUC Joint InstituteZhejiang UniversityHangzhouChina state key laboratory of molecular Reaction Dynamics and Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina state key laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijingChina Department of chemistry Zhejiang UniversityHangzhouChina Division of physics and Applied physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingaporeSingapore National laboratory of Solid state Microstructures Collaborative Innovation Center of Advanced MicrostructureSchool of Electronic Science and EngineeringNanjing UniversityNanjingChina state key laboratory of Infrared physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina Department of chemistry and Biochemistry California Nanosystems InstituteUniversity of CaliforniaLos AngelesCaliforniaUSA

Graphene with linear energy dispersion and weak electron-phonon interaction is highly anticipated to harvest hot electrons in a broad wavelength ***,the limited absorption and serious backscattering of hot-electrons result in inadequate quantum yields,especially in the mid-infrared ***,we report a macroscopic assembled graphene(nMAG)nanofilm/silicon heterojunction for ultrafast mid-infrared *** assembled Schottky diode works in 1.5-4.0μm at room temperature with fast response(20-30 ns,rising time,4 mm2 window)and high detectivity(1.61011 to 1.9109 Jones from 1.5 to 4.0μm)under the pulsed laser,outperforming single-layer-graphene/silicon photodetectors by 2-8 *** performances are attributed to the greatly enhanced photo-thermionic effect of electrons in nMAG due to its high light absorption(~40%),long carrier relaxation time(~20 ps),low work function(4.52 eV),and suppressed carrier number *** nMAG provides a long-range platform to understand the hot-carrier dynamics in bulk 2D materials,leading to broadband and ultrafast MIR active imaging devices at room temperature.

关键词： graphene nanofilm heterojunction macro-assembly mid-infrared photodetector photothermionic effect

Electrical and mechanical performance of graphene sheets exposed to oxidative environments

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Nano Research 2013年第7期6卷 485-495页

作者： Mario Lanza Yan Wang Teng gao Albin Bayerl Marc Porti Montserrat Nafria Yangbo Zhou Guangyin jing Yanfeng Zhang Zhongfan Liu Dapeng Yu Huiling Duan state key laboratory for Turbulence and Complex System Department of Mechanics and Aerospace Engineering CAPT College of Engineering Peking University Beijing 100871 China beijing Aeronautical science and Technology Research institute Beijing 10221 I China center for Nanochemistry (CNC) Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China Electronic Engineering Department Universitat Autonoma de Barcelona Cerdanyola del Valles 08193 Spain Department of physics State Key Laboratory for Mesoscopic Physics Peking University Beijing 100871 China physics Department Northwest University Xi'an 710069 China

Graphene coatings have been shown to protect the underlying material from oxidation when exposed to different media. However, the passivating properties of graphene in air at room temperature, which corresponds to the operating conditions of many electronic devices, still remain undear. In this work, we analyze the oxidation kinetics of graphene/Cu samples in air at room temperature for long periods of time （from I day to 113 days） using scanning electron microscopy, conductive atomic force microscopy and Auger electron microscop3~ and we compare the results with those obtained for similar samples treated in H202. We observe that unlike the graphene sheets exposed to H202, in which the accumulation of oxygen at the graphene domain boundaries evolves in a very controlled and progressive way, the local oxidation of graphene in air happens in a disordered manner. In both cases the oxide hillocks formed at the graphene domain boundaries can propagate to the domains until reaching a limiting width and height. Our results demonstrate that the local oxidation of the underlying material along the domain boundaries can dramatically decrease the roughness, conductivity, mechanical resistance and frictional characteristics of the graphene sheet, which reduces the performance of the whole device.

关键词： graphene local oxidation domain boundary passivating layer

Alloy-like ternary polymer solar cells with over 17.2% efficiency

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science Bulletin 2020年第7期65卷 538-545,M0003页

作者： Qiaoshi An Jian Wang Wei gao xiaoling Ma Zhenghao Hu jinhua gao Chunyu Xu Minghui Hao xiaoli Zhang Chuluo Yang Fujun Zhang School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China College of physics and Electronic Engineering Taishan UniversityTaian 271021China Shenzhen key laboratory of polymer science and Technology College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Hubei key laboratory on Organic and polymeric Optoelectronic Materials Department of ChemistryWuhan UniversityWuhan 400072China state Centre for International Cooperation on Designer Low-Carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China School of science Beijing Jiaotong UniversityBeijing 100044China

Ternary strategy has been considered as an efficient method to achieve high performance polymer solar cells(PSCs). A power conversion efficiency(PCE) of 17.22% is achieved in the optimized ternary PSCs with10 wt% MF1 in acceptors. The over 8% PCE improvement by employing ternary strategy is attributed to the simultaneously increased JSCof 25.68 mA cm^-2, VOCof 0.853 V and FF of 78.61% compared with Y6 based binary PSCs. The good compatibility of MF1 and Y6 can be confirmed from Raman mapping, contact angle,cyclic voltammetry and morphology, which is the prerequisite to form alloy-like state. Electron mobility in ternary active layers strongly depends on MF1 content in acceptors due to the different lowest unoccupied molecular orbital(LUMO) levels of Y6 and MF1, which can well explain the wave-like varied FF of ternary PSCs. The third-party certified PCE of 16.8% should be one of the highest values for single bulk heterojunction PSCs. This work provides sufficient references for selecting materials to achieve efficient ternary PSCs.

关键词： polymer solar cells Ternary strategy Nonfullerene acceptor Alloy-like model

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Direct low-temperature synthesis of graphene on various glasses by plasma-enhanced chemical vapor deposition for versatile, cost-effective electrodes

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Nano Research 2015年第11期8卷 3496-3504页

作者： jingyu Sun Yubin Chen xin Cai Bangjun Ma Zhaolong Chen Manish Kr. Priydarshi Ke Chen Teng gao xiuju Song Qingqing Ji Xuefeng Guo Dechun Zou Yanfeng Zhang Zhongfan Liu center for Nanochemistry (CNC) Beijing Science and Engineering Center for Nanocarbons College of Chemistry and Molecular Engineering Peking University Beijing 100877 China Department of Materials science and Engineering College of Engineering Peking University Beijing 100871 China beijing National laboratory for molecular sciences Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education College of Chemistry and Molecular Engineering Peking University Beijing 100871 China Department of chemistry and Chemical Biology Harvard University Cambridge MA 02138 USA

Catalyst-free and scalable synthesis of graphene on various glass substrates at low temperatures is of paramount significance to numerous applications such as low-cost transparent electronics and state-of-the-art displays. However, systematic study within this promising research field has remained scarce thus far. Herein, we report the direct growth of graphene on various glasses using a low-temperature plasma-enhanced chemical vapor deposition method. Such a facile and scalable approach guarantees the growth of uniform, transfer-free graphene films on various glass substrates at a growth temperature range of 400-600 ℃. The morphological, surface wetting, optical, and electrical properties of the obtained graphene can be tailored by controlling the growth parameters. Our uniform and high-quality graphene films directly integrated with low-cost, commonly used glasses show great potential in the fabrication of multi-functional electrodes for versatile applications in solar cells, transparent electronics, and smart windows.

关键词： graphene direct plasma-enhanced chemical vapor deposition (PECVD) glass various low-cost

The role of Cu crystallographic orientations towards growing superclean graphene on meter-sized scale

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Nano Research 2022年第4期15卷 3775-3780页

作者： xiaoting Liu jincan Zhang Wendong Wang Wei Zhao Heng Chen Bingyao Liu Mengqi Zhang Fushun Liang Lijuan Zhang Rui Zhang Ning Li Yuexin Zhang Yuchen Liu Kaicheng Jia Luzhao Sun Yixuan Zhao Peng gao Qinghong Yuan Li Lin Hailin Peng Zhongfan Liu center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China beijing Graphene institute Beijing 100095China Department of Engineering University of CambridgeCambridgeCB30FAUK School of physics and Astronomy University of ManchesterManchesterM139PLUK state key laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Electron Microscopy laboratory and International center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Centre for Theoretical and Computational molecular science Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandBrisbaneQLD 4072Australia School of Materials science and Engineering Peking UniversityBeijing 100871China

Chemical vapor deposition(CVD)-grown graphene films on Cu foils,exhibiting fine scalability and high quality,are still suffering from the adverse impact of surface contamination,i.e.,amorphous *** the recent successful preparation of superclean graphene through Cu-vapor-assisted reactions,the formation mechanism of amorphous carbon remains unclear,especially with regard to the functions of ***,we have found that the crystallographic orientations of underlying metal substrates would determine the cleanness of graphene in such a way that slower diffusion of active carbon species on asformed graphene-Cu(100)surface is the key factor that suppresses the formation of *** facile synthesis of clean graphene is achieved on the meter-sized Cu(100)that is transformed from the polycrystalline Cu ***,a clean surface of graphene on Cu(100)ensures the reduction of transfer-related polymer residues,and enhanced optical and electrical performance,which allows for versatile applications of graphene in biosensors,functioning as flexible transparent *** work would offer a promising material platform for the fundamental investigation and create new opportunities for the advanced applications of high-quality graphene films.

关键词： superclean graphene Cu crystallographic orientations Cu(100)foil improved electrical performance