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Delicate chemical structure regulation of nonfullerene acceptor for efficient and large thickness organic solar cells

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Science China Chemistry 2024年第5期67卷 1596-1604页

作者： Zhe zhang Wanying Feng Yunxin Zhang Shaohui Yuan Yuyang Bai Peiran Wang Zhaoyang Yao Chenxi Li Tainan Duan Xiangjian Wan Bin Kan Yongsheng Chen State Key Laboratory and Institute of Elemento-Organic Chemistry Frontiers Science Center for New Organic MatterThe Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China School of Materials Science and Engineering National Institute for Advanced MaterialsNankai UniversityTianjin 300350China Chongqing Institute of Green and Intelligent Technology Chongqing SchoolUniversity of Chinese Academy of Sciences(UCAS Chongqing)Chinese Academy of SciencesChongqing 400722China

Inspired by the success of CH-series acceptors, a small-molecular acceptor, CH-Tz was reported by adopting a new conjugationextended electron-deficient unit([1,2,5]thiadiazolo[3,4-b]pyrazine) on the central core. Owing to the enhanced inter-/intramolecular interactions, CH-Tz exhibited near-infrared absorption and an effective three-dimensional molecular packing network in its single crystal. When blended with polymer donor PM6, the binary device achieved a high power conversion efficiency(PCE) of 18.54%, with a notable short-circuit current density(J_(sc)) of 27.54 m A cm-2and an excellent fill factor(FF) over 80%,which can be partly ascribed to the balanced charge transport properties in the blend film. After employing D18-Cl as the third component, an enhanced PCE of 18.85% was achieved due to a more obvious fiber network. Impressively, the CH-Tz-based OSC devices show excellent thermal stability and thickness insensitivity. Record-breaking Jscof 28.92 m A cm-2was reached for PM6:D18-Cl:CH-Tz ternary device with a thickness of 560 nm. Besides, CH-Tz shows potential in fabricating multicomponent high-performance organic solar cells, where over 19% efficiency could be realized in the quaternary device. Our work advances the strong influence of electron-deficient central units on molecular photovoltaic properties and guides the design of acceptors for stable and large-thickness organic solar cells.

关键词： organic solar cells non-fullerene acceptor central unit large thickness molecular packing

Target serum concentration of vancomycin may be reached earlier with a loading dose

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Chinese Medical Journal 2022年第3期135卷 317-323页

作者： Yanxia Huang Le He yunxin Deng Renjing zhang Mei Meng Jiao Liu Dechang Chen Department of Critical Care Medicine Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 201801China Department of Pharmacy Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 201801China

Background:Vancomycin treatment failure against vancomycin-susceptible gram-positive cocci is not rare in the intensive care unit(ICU).One of the reasons for this is the substandard drug trough concentration.We aimed to examine the hypothesis that the target serum concentration could be reached earlier with a loading dose of vancomycin.Methods:This retrospective cohort study was conducted at our ICU between June 2018 and June 2020 and involved patients who were suspected of having,or confirmed to have,gram-positive cocci infection and treated with vancomycin.One group of the patients was administered a loading dose of vancomycin(loading group)and compared with the group that did not receive a loading dose(control group).The baseline characteristics,vancomycin serum concentrations,and clinical outcomes were collected and analyzed.Results:Fifty-five patients were finally included,of which 29 received a loading dose of vancomycin.The serum concentration of vancomycin before the second dose was significantly higher for the loading group than for the control group(10.3±6.1 mg/Lvs.5.7±4.4 mg/L,P=0.002).The results for both groups were similar before the fifth dose(12.4±7.3 mg/Lvs.10.3±6.3 mg/L in the loading and the control groups,respectively;P=0.251).The 28-day mortality was lower for the loading group than for the control group(6.7%vs.34.6%in the loading and control groups,respectively;P=0.026).No significant differences were observed in serum creatinine(Cr)concentrations of the two groups.Conclusion:With the loading dose of vancomycin,the target serum concentration of vancomycin may be reached earlier without increasing the risk of acute kidney injury.

关键词： Infection Loading dose Serum creatinine Trough concentration Vancomycin

Improved interfacial property by small molecule ethanediamine for high performance inverted planar perovskite solar cells

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Journal of Energy Chemistry 2021年第3期30卷 467-474页

作者： Guodong zhang Yunxin Zhang Siqi Chen Hao Chen Le Liu Wenming Ding Jinhui Wang Anyu zhang Shuping Pang Xin Guo Lianqing Yu Tonggang Jiu School of Materials Science and Engineering China University of PetroleumQingdao 266580ShandongChina Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of SciencesQingdao 266101ShandongChina Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023LiaoningChina

We report a simple and effective method to realize desirable interfacial property for inverted planar perovskite solar cells(PSCs)by using small molecule ethanediamine for the construction of a novel polyelectrolyte hole transport material(P3CT-ED HTM).It is found that P3CT-ED can not only improve the hole transport property of P3CT-K but also improve the crystallinity of adjacent perovskite film.In addition,the introduction of ethanediamine into P3CT realigns the conduction and valence bands upwards,passivates surface defects and reduces nonradiative recombination.As a consequence,compared to P3CT-K hole transport layer(HTL)based devices,the average power conversion efficiency(PCE)is boosted from17.2% to 19.6% for the counterparts with P3CT-ED,with simultaneous enhancement in open circuit voltage and fill factor.The resultant device displays a champion PCE of 20.5% with negligible hysteresis.

关键词： Improved interfacial property Inverted planar perovskite solar cells Passivated trap states Crystallinity Ethanediamine

Lowing the energy loss of organic solar cells by molecular packing engineering via multiple molecular conjugation extension

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Science China Chemistry 2022年第7期65卷 1362-1373页

作者： Hongbin Chen Yalu Zou Huazhe Liang Tengfei He Xiaoyun Xu Yunxin Zhang Zaifei Ma Jing Wang Mingtao zhang Quanwen Li Chenxi Li Guankui Long Xiangjian Wan Zhaoyang Yao Yongsheng Chen State Key Laboratory and Institute of Elemento-Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China School of Materials Science and Engineering National Institute for Advanced MaterialsRenewable Energy Conversion and Storage Center(RECAST)Nankai UniversityTianjin 300350China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China School of Materials Science&Engineering Tianjin University of TechnologyTianjin 300384China

The central unit(benzo[c][1,2,5]thiadiazole) in Y6 series of molecules plays a determining role in their unique intermolecular packing for a three-dimensionally(3D) network, largely endowing their organic solar cells(OSCs) with so far the best power conversion efficiencies(PCEs) and also largely suppressed energy losses(Eloss). Despite its vital role in molecular packing, very few explorations for central unit have been conducted due to possibly the constructing challenge of central heterocyclic units.Herein, a highly efficient acceptor-donor-acceptor(A-D-A) type electron acceptor, CH17, has been designed and constructed,featured with a prominent π extension in both directions of the central and end units with respect to Y6 series. Such a multiple and much enhanced conjugation extension in CH17 enables a much more effective and compact 3D molecular packing compared with that of Y6 supported by X-ray single crystal and other analysis, mainly caused by a newly observed distinctive dual “end unit to central unit” packing mode. This much favorable molecular packing, also kept in its blends with donor materials, leads a larger electron and hole transfer integrals and hence much improved charge transport, and reduced energetic disorders in CH17blends. More importantly, the observed upshifted charge transfer(CT) state of CH17 blends compared with that of Y6, due to its increased molecular conjugation extension in both directions, further enhances the hybridization between its CT and local exciton(LE) states, resulting in higher luminescence efficiency, much suppressed non-radiative recombination loss and smaller Elosswith respect to that of Y6. Consequently, an excellent PCE of 17.84% is achieved with PM6 as the donor in a binary device compared with a PCE of 16.27% for the controlled Y6 device. Furthermore, a further improved PCE of 18.13% is achieved by CH17-based ternary single-junction OSCs along with a markedly reduced Elossof 0.49 e V and larger open-circuit voltage(Voc) of0.89 V, compared with that(16.27% of PCE,

关键词： organic solar cells A-D-A electron acceptor reduced Eloss central unit multiple conjugation extension molecular packing

高寒草地土壤掩埋对凋落物分解速率的影响大于氮素富集

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Journal of Plant Ecology 2021年第6期14卷 1047-1059页

作者： Yuan Su Jiajia Le Xiaofei Ma Xiaolong Zhou Yunxin Zhang Yanming Gong Wenxuan Han Kaihui Li Xuejun Liu State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Bayinbuluk Grassland Ecosystem Research Station Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesBayinbuluk 841314China University of Chinese Academy of Sciences Beijing 100049China Chinese Academy of Sciences Research Center for Ecology and Environment of Central Asia Urumqi 830011China Key Laboratory of Oasis Ecology Xinjiang UniversityUrumqi 830046XinjiangChina Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation College of Resources and Environmental SciencesChina Agricultural UniversityBeijing 100193China

由于高寒草地退化、鼠害严重、大风频繁等原因,凋落物被频繁掩埋在土壤中。但凋落物的位置变化和氮富集对高寒草原凋落物分解速率和养分动态影响的认识尚不清楚。为了研究凋落物位置变化(地表、掩埋10 cm和悬空60 cm)和氮富集对高寒草... 详细信息

由于高寒草地退化、鼠害严重、大风频繁等原因,凋落物被频繁掩埋在土壤中。但凋落物的位置变化和氮富集对高寒草原凋落物分解速率和养分动态影响的认识尚不清楚。为了研究凋落物位置变化(地表、掩埋10 cm和悬空60 cm)和氮富集对高寒草原优势植物凋落物分解的影响,本研究依托2009年在新疆天山巴音布鲁克高寒草原设置的长期模拟氮沉降研究平台,以对照和氮富集处理样方的优势植物羊茅(Festuca ovina)和赖草(Leymus tianschanicus)凋落物为试验材料,测定分解过程中凋落物质量损失和碳氮磷含量的变化特征。研究结果表明,掩埋凋落物分解速率显著快于地表凋落物,悬空处理凋落物分解速率慢于地表凋落物。氮富集显著影响凋落物质量,进而影响凋落物分解。而凋落物质量残留在对照与氮富集土壤掩埋之间无显著差异。这些结果表明,氮富集通过凋落物质量而不是通过土壤环境因素,影响短期凋落物分解。不同处理的所有试验凋落物均有碳和磷的释放现象。对照处理的凋落物,凋落物氮以累积为主,而氮富集处理的凋落物,凋落物氮以释放为主。这表明凋落物分解可能受到氮元素限制,氮富集改变了凋落物分解调控的氮循环过程。本研究提供了直接证据,掩埋处理的凋落物有更快的质量损失和碳元素释放,土壤掩埋是旱地凋落物分解速率比模型预测的快的一个候选解释。

关键词：高寒草地氮富集凋落物位置凋落物分解凋落物质量养分释放

Research on Residual Stress Measurement of Magnesium Alloy Cabin Castings

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上海航天（中英文） 2022年第1期39卷 46-54页

作者： YIN Lan FANG Yu WU yunxin zhang Tao LI Chengxin GONG Hai Light Alloy Research Institute Central South UniversityChangsha 410083HunanChina State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083HunanChina College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083HunanChina Shanghai Spaceflight Precision Machinery Institute Shanghai 201600China

Owing to the nonuniform wall thickness and complex internal structure,the measurement of the residual stress on magnesium alloy cabin castings is complex and difficult extremely,and thus seldom research has focused on the residual stress of magnesium alloy castings.In this paper,the blind-hole method,the X-ray diffraction(XRD)method,and the contour method are used to conduct comprehensive and systematic residual stress tests for a magnesium alloy cabin casting.The results show that the residual stress on the surface of the casting obtained by the blind-hole method is between-20.03 MPa and-71.03 MPa,the residual stress obtained by the XRD method is between-26.01 MPa and-87.11 MPa,while the residual stress obtained by the contour method is between-45.89 MPa and 76.87 MPa.The study can lay a basis for the subsequent research of magnesium alloy cabin castings,and provide a reference for the residual stress test of magnesium alloy castings.

关键词： magnesium alloy residual stress XRD method blind-hole method contour method

Lensless Fourier-transform terahertz digital holography for real-time full-field phase imaging

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Photonics Research 2022年第2期10卷 323-331页

作者： Yaya zhang Jie Zhao Dayong WANG yunxin Wang Lu Rong College of Physics and Optoelectronics Faculty of ScienceBeijing University of TechnologyBeijing 100124China Beijing Engineering Research Center of Precision Measurement Technology and Instruments Beijing 100124China

With the development of continuous-wave terahertz(THz) sources and array detectors, the pursuit of highfidelity real-time imaging is receiving significant attention within the THz community. Here, we report a real-time full-field THz phase imaging approach based on lensless Fourier-transform THz digital holography.A triangular interferometric layout is proposed based on an oblique illumination of 2.52 THz radiation, which is different from other lensless holographic configurations at other frequencies. A spherical reference beam is generated by a reflective parabolic mirror with minor propagation loss. The complex-valued images are reconstructed using a single inverse Fourier transform of the hologram without complex calculation of the diffraction propagation. The experimental result for a Siemens star validates the lateral resolution of-46 μm in the diagonal direction. Sub-pixel image registration and image stitching algorithms are applied to enlarge the area of the reconstructed images. The dehydration process of an aquatic plant leaf(Hottonia inflata) is monitored for the first time, to the best of our knowledge, at the THz band. Rapid variations in water content and morphology are measured with a time interval of 0.6 s and a total time of 5 min from a series of reconstructed amplitude and phase images, respectively. The proposed method has the potential to become a powerful tool to investigate spontaneous phenomena at the THz band.

关键词： phase transform field

Recent applications and strategies in nanotechnology for lung diseases

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Nano Research 2021年第7期14卷 2067-2089页

作者： Wenhao Zhong Xinyu zhang yunxin Zeng Dongjun Lin Jun Wu Department of Hematology The Seventh Affiliated HospitalSun Yat-sen UniversityShenzhen 518107China Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong Province School of Biomedical EngineeringSun Yat-sen UniversityGuangzhou 510006China

Lung diseases,including COVID-19 and lung cancers,is a huge threat to human health.However,for the treatment and diagnosis of various lung diseases,such as pneumonia,asthma,cancer,and pulmonary tuberculosis,are becoming increasingly challenging.Currently,several types of treatments and/or diagnostic methods are used to treat lung diseases;however,the occurrence of adverse reactions to chemotherapy,drug-resistant bacteria,side effects that can be significantly toxic,and poor drug delivery necessitates the development of more promising treatments.Nanotechnology,as an emerging technology,has been extensively studied in medicine.Several studies have shown that nano-delivery systems can significantly enhance the targeting of drug delivery.When compared to traditional delivery methods,several nanoparticle delivery strategies are used to improve the detection methods and drug treatment efficacy.Transporting nanoparticles to the lungs,loading appropriate therapeutic drugs,and the incorporation of intelligent functions to overcome various lung barriers have broad prospects as they can aid in locating target tissues and can enhance the therapeutic effect while minimizing systemic side effects.In addition,as a new and highly contagious respiratory infection disease,COVID-19 is spreading worldwide.However,there is no specific drug for COVID-19.Clinical trials are being conducted in several countries to develop antiviral drugs or vaccines.In recent years,nanotechnology has provided a feasible platform for improving the diagnosis and treatment of diseases,nanotechnology-based strategies may have broad prospects in the diagnosis and treatment of COVID-19.This article reviews the latest developments in nanotechnology drug delivery strategies in the lungs in recent years and studies the clinical application value of nanomedicine in the drug delivery strategy pertaining to the lung.

关键词： lung diseases drug delivery nanoparticles

Relationship between Microstructure Evolution and the Luminescent Properties of Eu^(3+)-doped Yttrium Aluminum Garnet and Y_2O_3 Nano-powders

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Journal of Materials Science & Technology 2013年第3期29卷 225-230页

作者： Jie zhang Yongyi Gao Junjie Xiao Changfu Xu yunxin Liu Qibin Yang Institute of Modern Physics Xiangtan University Department of Physics Hunan University of Science and Technology

Eu3＋-doped yttrium aluminum garnet （YAG） and Y2O3 composite phase nanoparticles were synthesized using a modified hydrothermal method. Sintering was performed at 800 ℃, which is considerably lower than the sintering temperature used in the conventional method, y3＋ in YAG and Y2O3 was partially substituted with Na＋ by adding NaNO3 into the solution during sample synthesis. The microstructures and phase transformation process were characterized through X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The obtained results verified that the addition of Na＋ promoted crystallinity and grain growth of the three phases, namely, Y2O3, Y4Al2O9, and Y3Al5O12. Highly efficient luminescence properties excited by 254 and 365 nm ultraviolet were achieved. In conclusion, the remarkable enhancement of the luminescence intensity with the addition of Na＋ should be attributed to grain growth and improvement of crystallinity.

关键词： Nanostructure Chemical synthesis Optical properties Luminescence