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Non-fullerene acceptors with heteroatom substitution on the core moiety for efficient organic photovoltaics

Infomat 2024年第8期6卷 20-35页

作者： Feng Qi Baobing fan Qunping fan Alex K.-y.Jen Department of Chemistry City University of Hong KongKowloonHong Kongthe People's Republic of China Hong Kong Institute for Clean Energy City University of Hong KongKowloonHong Kongthe People's Republic of China College of materials Science and Engineering Qingdao UniversityQingdaoPeople's Republic of China State Key Laboratory for mechanical Behavior of materials Xi'an Jiaotong UniversityXi'anPeople's Republic of China Department of materials Science&Engineering University of WashingtonSeattleWashingtonUSA State Key Laboratory of marine Pollution City University of Hong KongKowloonHong Kongthe People's Republic of China

Organic photovoltaics(OPVs)represent one of the most promising photovoltaic technologies owing to their high capacity to convert solar energy to *** the continuous structure upgradation of photovoltaic materials,especially that of non-fullerene acceptors(NFAs),the OPV field has witnessed rapid progress with power conversion efficiency(PCE)exceeding 19%.However,it remains challenging to overcome the intrinsic trade-off between the photocurrent and photovoltage,restricting the further promotion of the OPV *** this regard,it is urgent to further tailor the structure of NFAs to broaden their absorption spectra while mitigating the energy loss of relevant devices *** substitution on the fused-ringπ-core of NFAs is an efficient way to achieve this *** addition to improve the nearinfrared light harvest by strengthening the intramolecular charge transfer,it can also enhance the molecular stacking via forming multiple noncovalent interactions,which is favorable for reducing the energetic ***,in this review we focus on the design rules of NFAs,including the polymerized NFAs,of which the core moiety is substituted by various kinds of *** also afford a comprehensive understanding on the structure–propertyperformance relationships of these ***,we anticipate the challenges restricting the efficiency promotion and industrial utilization of OPV,and provide potential solutions based on the further heteroatom optimization on NFA core-moiety.

关键词： core moiety heteroatom substitution near-infrared absorption non-fullerene acceptor organic photovoltaics reduced energy loss

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ELASTO-PLASTIC BRANCHED ANALySIS FOR AN INTERFACE CRACK BASED ON CRACK ENERGy DENSITy

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Acta mechanica Solida Sinica 1995年第2期8卷 171-177页

作者： fan, Xy SATO, y WATANABE, K TAIyUAN UNIV TECHNOL INST APPL MECHTAIYUAN 030024PEOPLES R CHINA UNIV TOKyO INST IND SCITOKYO 106JAPAN

The elasto-plastic finite element analyses for an interface crack in dissimilar material, based on the crack energy density (CED) concept, are investigated in mode I loading condition. It is confirmed that the values of CED almost remain stable when the notch radius rho is sufficiently small, both in elastic and elasto-plastic case. Numerical results for both elastic and elasto-plastic cases show that under the mode I loading condition, when the crack propagates to the more stiff material with a small angle, the total CED will become larger than that along the interface. If the clack heads into the more compliant material, the CED will become less than that along the interface.

关键词： INTERFACE CRACK CRACK ENERGy DENSITy

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STUDIES　ON　THE　mAGNETIC　RESONANCE　CONTRAST　AGENTS　SyNTHESIS　AND　SPIN－LATTICE　RELAXIVITy　OF　AmINO　ACIDS　AND　OLIGOPEPTIDyL　DERIVATIVES　OF　GD－DTPA

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Chinese Chemical Letters 1995年第5期6卷 377-378页

作者： Luo, y Zhuo, RX fan, CL Beijing Univ Dept Chem Beijing 100871 Peoples R China Wuhan Univ Dept Chem Wuhan 430072 Peoples R China

A series of amino acids and oligopeptidyl derivatives of GdDTPA were *** structure of these chelates were confirmed by IR and elementary analysis .Toxicity of chelates was almost the same as Gd-DTPA. The spin- lattic... 详细信息

关键词： DTPA GD AGENTS ACIDS

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SUSTAINED RELEASE OF LEVONORGESTREL USING POLyPHOSPHATE AS DRUG CARRIER

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Chinese Chemical Letters 1995年第4期6卷 333-334页

作者： Luo, y Zhuo, RX fan, CL Beijing Univ Dept Chem Beijing 100871 Peoples R China Wuhan Univ Dept Chem Wuhan 430072 Peoples R China

A novel crosslinking polyphosphate was synthesized. The polymer was characterized by FT-IR, (HNmR)-H-1, (PNmR)-P-31 nd elemental analysis, In vitro release of Levonorgestrel by single-matrix and sandwich pellet with polyphosphate as drug carrier were carried out in pH 7.4 phosphate buffer solution at 37 degreesC, Sustained release rate from-the sandwich pellet was more controlled than that from single-matrix pellet.

关键词： AS SUSTAINED RELEASE OF LEVONORGESTREL USING POLyPHOSPHATE AS DRUG CARRIER

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Structures and formation mechanisms of dislocation-induced precipitates in relation to the age-hardening responses of Al-mg-Si alloys

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Journal of materials Science & Technology 2020年第6期41卷 127-138页

作者： y.X.Lai W.fan m.J.yin C.L.Wu J.H.Chen Center for High-Resolution Electron microscopy College of Materials Science&EngineeringHunan UniversityChangsha 410082China Electron microscopy Center Shenzhen UniversityShenzhen 518060China

In the slightly deformed Al-mg-Si alloys,dislocation-induced precipitates are frequently observed,and they usually line up,forming sophisticated precipitation *** atomic-resolution electron microscopy in association with hardness measurements,we systematically investigated these precipitates in relation to the age-hardening responses of the *** study reveals that the majority of dislocation-induced complex precipitates are actually short-range ordered while long-range disordered polycrystalline precipitates and multiphase composite precipitates,including polycrystalline U2 precipitates,B’/U2,B’-2/U2,B’/B’-2/U2 and’/U2 composite *** is suggested that the formation of these complex precipitates is mainly owing to a high nucleation rate and rapid growth of different precipitate phases parallel to the associated dislocation *** dislocation-induced precipitates consume more mg than Si from the matrix and have a high formation kinetics,they will have different impacts on the matrix precipitation in different types of Al-mg-Si *** results further demonstrate that for the"normally-β"-hardened"alloy,their formation leads to a coarser precipitate microstructure in the matrix,whereas for the"normally-β’-hardened"alloy,their formation reverses the precipitation pathway in the matrix,resulting in a reduced age-hardening potential of the former alloy and an improved age-hardening potential of the latter alloy.

关键词： Al-mg-Si alloys Precipitation Dislocation Age-hardening Electron microscopy

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Effect of Inorganic Filler on Thermally Stimulated Current in Low-density Polyethylene

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Journal of materials Science & Technology 1997年第3期13卷 223-226页

作者： Lei, QQ fan, y Wang, X Lin, JQ Xiong, yL Dept. of Electrical materials Engineering Harbin University of Science and Technology Harbin 150040 China

By measuring the thermally stimulated current (TSC) spectra at various fields in low-density polyethylene with inorganic filler (f-LDPE) and comparing with those in LDPE, we found that their TSC spectra show significant distinction. In virtue of analysing change of peak current, peak temperature and activation energy with poling field, it can be depicted that the TSC in f-LDPE specimen comes from dipole relaxation of residual silanol groups on surface of filler, but the injected electrons in very high fields, no doubt, are captured in deeper traps, and they can not be released even near 100 degrees C. The filler (kaolin) plays a key role in changing the TSC spectra through deep and interfacial traps existing between the filler and the polymer matrix. Whereas, the TSC spectra of LDPE specimen possess marked characteristics of electron release from traps in amorphous-crystalline or crystalline region.

关键词： Low density polyethylenes

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Evolution of zinc morphology during continuous electrodeposition

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Journal of University of Science and Technology Beijing 2003年第1期10卷 35-38页

作者： Ailing fan m.Kurosaki 等 DepartmentofmaterialsPhysicsandChemistry UniversityofScienceandTechnologyBeijingBeijing100083China SteelResearchLaboratoires NipponSteelCorporation20-1ShintomiFuttsuChiba-ken293

The morphology evolution of zinc continuous electrodeposits with nano-sized crystals on the ferrite substrate has been studied by in-situ scanning tunnel spectroscopy (STm). It is found that the morphology of zinc electrodeposits varies from initial granules with a size of about 30nm to layered platelets with increasing deposition time. meanwhile, the crystal structure of the zinc electrodeposits is identified to be hexagonal η-phase by X-ray diffraction. The orientation relationship between zinc crystals and the substrate surface can be interpreted in terms of the misfit and the atomic correspondence of the interphase boundary between the η-phase deposits and α-Fe substrate.

关键词： Zn electrodeposit crystal morphology epitaxial growth orientation relationship scanning tunnel spectroscopy

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Oxygen transfer in human carotid artery bifurcation

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Acta mechanica Sinica 2007年第3期23卷 305-309页

作者： Z. G. Zhang y. B. fan X. y. Deng Dalian University of Technology Dalian 116023 China Department of Bioengineering Beihang UniversityBeijing 100083 China

Arterial bifurcations are places where blood flow may be disturbed and slow recirculation flow may occur. To reveal the correlation between local oxygen transfer and atherogenesis, a finite element method was employed to simulate the blood flow and the oxygen transfer in the human carotid artery bifurcation. Under steady-state flow conditions, the numerical simulation demonstrated a variation in local oxygen transfer at the bifurcation, showing that the convective condition in the disturbed flow region may produce uneven local oxygen transfer at the blood/wall interface. The disturbed blood flow with formation of slow eddies in the carotid sinus resulted in a depression in oxygen supply to the arterial wall at the entry of the sinus, which in turn may lead to an atherogenic response of the arterial wall, and contribute to the development of atherosclerotic stenosis there.

关键词： Atherosclerosis Carotid artery Secondary flow mass transfer

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PREDICTION FOR FORmING LImIT OF AL2024T3 SHEET BASED ON DAmAGE THEORy USING FINITE ELEmENT mETHOD

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Acta mechanica Solida Sinica 2006年第2期19卷 174-180页

作者： Tang C.y. fan Jianping Tsui C.P. Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hong Kong China School of Civil Engineering and mechanics Huazhong University of Science and Technology Wuhan 430074 China

This paper presents the application of anisotropic damage theory to the study of forming limit diagram of A12024T3 aluminum alloy sheet. In the prediction of limiting strains of the aluminum sheet structure, a finite element cell model has been constructed. The cell model consists of two phases, the aluminum alloy matrix and the intermetallic cluster. The material behavior of the aluminum alloy matrix is described with a fully coupled elasto-plastic damage constitutive equation. The intermetallic cluster is assumed to be elastic and brittle. By varying the stretching ratio, the limiting strains of the sheet under biaxial stretching have been predicted by using the necking criterion proposed. The prediction is in good agreement with the experimental findings. moreover, the finite element cell model can provide information for understanding the microscopic damage mechanism of the aluminum alloy. Over-estimation of the limit strains may result if the effect of material damage is ignored in the sheet metal forming study.

关键词： forming limit diagram (FLD) anisotropic damage finite element method (FEm) limit strain localized necking elasto-plastic deformation

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THE EVALUATION OF STRESS INTENSITy FACTORS OF PLANE CRACK FOR ORTHOTROPIC PLATE WITH EQUAL PARAmETER By F2LFEm

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Acta mechanica Solida Sinica 2006年第2期19卷 128-134页

作者： fan Jie Zhang Xiaochun A.y.T. LEUNG Zhong Weifang Department of mechanics Huazhong University of Science and Technology Wuhan 430074 China Department of Building and Construction City University of Hong Kong Hong Kong China

In this paper, the evaluation of stress intensity factor of plane crack problems for orthotropic plate of equal-parameter is investigated using a fractal two-level finite element method （F2LFEm）. The general solution of an orthotropic crack problem is obtained by assimilating the problem with isotropic crack problem, and is employed as the global interpolation function in F2LFEm. In the neighborhood of crack tip of the crack plate, the fractal geometry concept is introduced to achieve the similar meshes having similarity ratio less than one and generate an infinitesimal mesh so that the relationship between the stiffness matrices of two adjacent layers is equal. A large number of degrees of freedom around the crack tip are transformed to a small set of generalized coordinates. Numerical examples show that this method is efficient and accurate in evaluating the stress intensity factor （SIF）.

关键词： plane crack orthotropic plate fractal finite element stress intensity factor

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