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Wafer-scale heterogeneous integration of self-powered lead-free metal halide UV photodetectors with ultrahigh stability and homogeneity

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Journal of Materials Science & Technology 2023年第33期164卷 150-159页

作者： Ming Deng Ziqing Li Xiaolei Deng Ying Hu xiaosheng fang Department of Materials Science State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200433China Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsFudan UniversityShanghai 200433China

Large-scale growth and heterogeneous integration with existing semiconductors are the main obstacles to the application of metal halide perovskites in optoelectronics.Herein,a universal vacuum evaporation strategy is presented to prepare copper halide films with wafer-scale spatial homogeneity.Benefiting from the electric field manipulation method,the built-in electric fields are optimized and further boost the self-powered UV photodetecting performances of common wide-bandgap semiconductors by more than three orders of magnitude.Furthermore,with effective modulation of the interfacial charge dynamics,the as-fabricated GaN-substrate heterojunction photodetector demonstrates an ultrahigh on/off ratio exceeding 107,an impressive responsivity of up to 256 mA W^(-1),and a remarkable detectivity of 2.16×10^(13) Jones at 350 nm,0 V bias.Additionally,the device exhibits an ultrafast response speed(t r/t d=716 ns/1.30 ms),an ultra-narrow photoresponse spectrum with an FWHM of 18 nm and outstanding continuous operational stability as well as long-term stability.Subsequently,a 372-pixel light-powered imaging sensor array with the coefficient of variation of photocurrents reducing to 5.20%is constructed,which demonstrates exceptional electrical homogeneity,operational reliability,and UV imaging capability.This strategy provides an efficient way for large-scale integration of metal halide perovskites with commercial semiconductors for miniature optoelectronic devices.

关键词： Photodetector Lead-free metal halide Wafer-scale Vacuum evaporation Imaging sensor

Integration of filter membrane and Ca_(2)Nb_(3)O_(10) nanosheets for high performance flexible UV photodetectors

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Journal of Materials Science & Technology 2022年第34期129卷 108-114页

作者： Yong Zhang Fa Cao Siyuan Li Xinya Liu Lixing Kang Limin Wu xiaosheng fang School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Department of Materials Science Fudan UniversityShanghai 200433China Division of Advanced Materials Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhou 215123China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

We report that the integration of filter membrane and Ca_(2)Nb_(3)O_(10)nanosheets(FM@CNO) UV photodetector(UV PD) shows high performance and excellent flexibility. The Ca_(2)Nb_(3)O_(10)nanosheets were prepared by a facile solid-state reaction and liquid exfoliation process. The Ca_(2)Nb_(3)O_(10)nanosheets can be integrated into the pores of a filter membrane via a simple vacuum filtration method. The FM@CNO UV PD shows high performance under 300 nm light illumination at 5 V bias, including high responsivity(0.08 AW^(-1)), high detectivity(1.1 × 10^(12)Jones), high UV/visible rejection ratio(3.86 × 10^(3)) and fast speed(0.12/1.24 ms). Furthermore, the FM@CNO device exhibits excellent flexibility after many bending cycles.In addition, the FM@CNO array device was used as a pixel array detector for UV imaging. This work provides a novel approach to achieve high performance flexible PDs based on filter membrane and two dimensional materials.

关键词： UV photodetector Ca_(2)Nb_(3)O_(10)nanosheets Filter membrane Flexible

Two-dimensional perovskite Pb_(2)Nb_(3)O_(10) photodetectors

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Journal of Materials Science & Technology 2023年第33期164卷 95-101页

作者： Yong Zhang Jian Yao Zhen Zhang Rong Zhang Li Li Yu Teng Zongjie Shen Lixing Kang Limin Wu xiaosheng fang School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Division of Advanced Materials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Department of Materials Science State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200433China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

For the first time,we report high-performance two-dimensional(2D)perovskite Pb_(2)Nb_(3)O_(10) photodetectors(PNO PDs).The few-layer PNO nanosheets are obtained successfully through a simple calcination and liquid exfoliation method.The individual PNO nanosheet devices with various structures(Au-PNO-Au,Au-PNO-Ti,Ti-PNO-Ti)are fabricated and investigated.The Au-PNO-Ti device exhibits a high rectification factor(∼102)owing to a large Schottky barrier difference between the PNO nanosheet and two asymmetric electrodes.Notably,the Au-PNO-Ti device shows excellent self-powered performance,including high responsivity(2.8 A/W),high detectivity(1.1×10^(12) Jones),and fast speed(0.2/1.2 ms)at 350 nm light illumination.This work not only suggests the performance of the PNO nanosheet PDs but also sheds light on the development of high-stability and high-performance devices based on 2D perovskite niobate in the future.

关键词： Pb2Nb3O10 Photodetectors Self-powered Two-dimensional Perovskite

Facile fabrication of heterostructure with p-BiOCl nanoflakes and n-ZnO thin film for UV photodetectors

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Journal of Semiconductors 2021年第5期42卷 70-78页

作者： Longxing Su Weixin Ouyang xiaosheng fang Department of Materials Science Fudan UniversityShanghai 200433China Department of Physical Science and Technology ShanghaiTech UniversityShanghai 200433China

Herein, high-quality n-ZnO film layer on c-sapphire and well-crystallized tetragonal p-BiOCl nanoflakes on Cu foil are prepared, respectively. According to the absorption spectra, the bandgaps of n-ZnO and p-BiOCl are confirmed as ~3.3 and~3.5 eV, respectively. Subsequently, a p-BiOCl/n-ZnO heterostructural photodetector is constructed after a facile mechanical bonding and post annealing process. At –5 V bias, the photocurrent of the device under 350 nm irradiation is ~800 times higher than that in dark, which indicates its strong UV light response characteristic. However, the on/off ratio of In–ZnO–In photodetector is ~20 and the Cu–BiOCl–Cu photodetector depicts very weak UV light response. The heterostructure device also shows a short decay time of 0.95 s, which is much shorter than those of the devices fabricated from pure ZnO thin film and BiOCl nanoflakes. The p-BiOCl/n-ZnO heterojunction photodetector provides a promising pathway to multifunctional UV photodetectors with fast response, high signal-to-noise ratio, and high selectivity.

关键词： ZnO thin film BiOCl nanoflakes heterostucture UV photodetector

Flexible 2D Cu Metal:Organic Framework@MXene Film Electrode with Excellent Durability for Highly Selective Electrocatalytic NH_(3) Synthesis

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Research 2022年第3期2022卷 321-331页

作者： Jing Wang Tao Feng Jiaxin Chen Jr-Hau He xiaosheng fang Department of Materials Science Fudan UniversityShanghai 200433China School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China Department of Materials Science and Engineering City University of Hong KongTat Chee AvenueKowloonHong Kong

Electrocatalytic nitrate reduction to ammonia(ENRA)is an effective strategy to resolve environmental and energy crisis,but there are still great challenges to achieve high activity and stability synergistically for practical application in a fluid environment.The flexible film electrode may solve the abovementioned problem of practical catalytic application owing to the advantages of low cost,light weight,eco-friendliness,simple and scalable fabrication,extensive structural stability,and electrocatalytic reliability.Herein,2D hybridization copper 1,4-benzenedi-carboxylate(CuBDC)has been grown on electronegative MXene nanosheets(Ti_(3)C_(2)T_(x))seamlessly to prepare a 2D flexible CuBDC@Ti_(3)C_(2)T_(x)electrode for ENRA.The flexible electrode simultaneously exhibits high Faradaic efficiency(86.5%)and excellent stability for NH_(3)synthesis,which are comparable to previously reported nanomaterials toward ENRA.Especially,the flexible electrode maintains outstanding FENH_(3)toward ENRA after the bending,twisting,folding,and crumpling tests,indicating excellent electroconductibility,high stability,and durability.This work not only provides mild permeation-mediated strategy to fabricate a flexible electrode but also explores the practical applications of the electrode with effectively environmental adaptability in solving global environmental contamination and energy crisis by effective ENRA.

关键词： electrode catalytic stability

Bi-based Nanowire and Nanojunction Arrays:Fabrication and Physical Properties

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Journal of Materials Science & Technology 2007年第2期23卷 166-181页

作者： Liang LI Guanghai LI xiaosheng fang Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Nanoscale Materials Center National Institute for Materials Science （NIMS）Namiki 1-1 Tsukuba Ibaraki 305-0044Japan

This article reviews the recent developments in the fabrication and properties of one-dimensional （1D） Bi-based nanostructures, including Bi, Sb, BixSb1-x and Bi2Te3 nanowire arrays, and Bi-Bi and Bi-Sb nanojunction arrays. In this article, we present an efiective method to fabricate Bi nanowire arrays with difierent diameters in anodic alumina membrane （AAM） with a single pore size by the pulsed electrodeposition. The fabrication of the high-filling and ordered Bi1-xSbx and Bi2Te3 single crystalline nanowire arrays, the Bi nanowire metalsemiconductor homojunction and Bi-Sb nanowire metal-semiconductor heterojunction arrays by the pulsed electrodeposition are reported. The factors controlling the composition, diameter, growth rate and orientation of the nanowires are analyzed, and the growth mechanism of the nanowire and nanojunction arrays are discussed together with the study of the electrical and thermal properties of Bi-based nanowires and nanojunctions.Finally, this review is concluded with some perspectives on the research directions and focuses in the Bi-based nanomaterials fields.

关键词： Bi One-dimensional Nanowire array Thermoelectric Electrodeposition

Tunable self-powered n-SrTiO3 photodetectors based on varying CuS-ZnS nanocomposite film (p-CuZnS, p-CuS, and n-ZnS)

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InfoMat 2019年第4期1卷 542-551页

作者： Yong Zhang Xiaojie Xu xiaosheng fang Department of Materials Science Fudan UniversityShanghaiChina

The heterojunction photodetector between n-SrTiO3(n-STO)and p-CuS-ZnS(p-CZS)is prepared by a simple chemical bath deposition.The p-CZS/n-STO photodetector exhibits excellent self-powered characteristics under 390-nm light illumination,including high photosensitivity(on/off ratio of 300),fast response speed(0.7/94.6 ms),and good wavelength selectivity(410-380 nm).More importantly,the self-powered n-STO photodetectors can be regulated by varying the composition of CZS film(p-CZS,p-CuS,and n-ZnS).All devices exhibit a large opencircuit voltage and show different self-powered behaviors because of the different built-in electric fields.The open-circuit voltages of the CZS/STO,CuS/STO,and ZnS/STO devices are measured to be 0.56,0.30,and 0.35 V,respectively.This work provides a simple and effective way to fabricate tunable self-powered photodetectors by varying the composition of the nanocomposite film.

关键词： CuS-ZnS photodetectors self-powered SrTiO3

Morphology-Controlled Growth of A1N One-Dimensional Nanostructures

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Journal of Materials Science & Technology 2008年第4期24卷 608-614页

作者： Ting XIE Min YE xiaosheng fang Zhi JIANG Li CHEN Mingguang KONG Yucheng WU Lide ZHANG Institute of Tribology Hefei University .of Technology Hefei 230009 China Key laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

Aluminum nitride （AIN） nanowires, serrated nanoribbons, and nanoribbons were selectively obtained through a simple chloride assisted chemical vapor deposition process. The morphologies of the products could be controlled by adjusting the deposition position and the flux of the reactant gas. The morphologies and structures of the AIN products were investigated in detail. The formation mechanism of the as-prepared different morphologies of AIN one-dimensional （ID） nanostructures was discussed on the basis of the experimental results.

关键词： Aluminum nitride Morphology-controlled growth One-dimensional nanostructure

Decitabine in combination with idarubicin within a modified busulfan/cyclophosphamide conditioning regimen for patients with advanced myelodysplastic syndrome: A prospective multicenter clinical cohort study

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中华医学杂志(英文版) 2024年第9期137卷 1115-1117页

作者： Cao Yigeng Wang Mingyang Wang Fuxu Guo Wenwen Ma Yueshen Li Xiaoyun He Yi Pang Aiming Zhang Rongli Zhai Weihua Chen Xin Ma Qiaoling Wei Jialin Yang Donglin Huang Yong Feng Dan Liu Jia Gao Xin Wen Shupeng Wang Wen Wang Tao Li Ying fang xiaosheng Li Yingchun Zhang Xiaohan Cai Yun Wang Yongqi Cao Weijie Lu Runqing Feng Sizhou Guo Rong Fu Yuewen Du Xin Liu Zhuogang Wang Xin Wang Ling Ma Liangming Liu Chuanfang Zhang Xuejun Han Mingzhe Jiang Erlie China Department of Hematology Second Hospital of Hebei Medical University Hebei Key Laboratory of Hematology Shijiazhuang Hebei China Center for Information and Resource State Key Laboratory of Experimental Hematology National Clinical Research Center for Blood Diseases Department of Hematopoietic Stem Cell Transplantation Center Haihe Laboratory of Cell Ecosystem Institute of Hematology Blood Diseases Hospital Chinese Academy of Medical Sciences & Department of Hematology Qilu Hospital of Shandong University Jinan Shandong China Department of Hematology State Key Laboratory of Experimental Hematology Shanxi Bethune Hospital Third Hospital of Shanxi Medical University Taiyuan Shanxi China Department of Hematology Qingdao Central Hospital University of Health and Rehabilitation Sciences Qingdao Shandong National Clinical Research Center for Blood Diseases China Department of Hematology Shandong Provincial Hospital Cheeloo College of Medicine Shandong University Jinan Shandong China Department of Hematology Shandong Provincial Hospital Affiliated to Shandong First Medical University Haihe Laboratory of Cell Ecosystem Jinan Shandong China Department of Hematology Shengjing Hospital of China Medical University Shenyang Liaoning China Department of Hematology Shenzhen Second People’s Hospital Institute of Hematology The First Affiliated Hospital of Shenzhen University Shenzhen University School of Medicine Shenzhen Guangdong China Department of Hematology Henan Cancer Hospital Cancer Hospital Affiliated Zhengzhou University Zhengzhou Henan Blood Diseases Hospital China Department of Hematology Department of Hematology The First Affiliated Hospital of Zhengzhou University Zhengzhou Henan China Chinese Academy of Medical Sciences & Peking Union Medical College Tianjin

To the Editor:Allogeneic hemopoietic stem cell transplantation (allo-HSCT) represents the only long-term survival treatment choice for patients with myelodysplastic syndromes (MDS) and MDS/myeloproliferative neoplasm (MPN).Unfortunately,post-hemopoietic stem cell transplantation (HSCT) relapse remains a cause of treatment failure and the results of salvage treatments are poor.Developing better conditioning regimens is urgently needed.Previous studies have shown synergistic antileukemic effects between decitabine (DEC) and idarubicin (IDA).In an attempt to design a conditioning strategy with very low toxicity but considerable myelosuppressive activity and potential immune-enhancing effects for patients with high-risk MDS and MDS/MPN,we combined DEC and IDA with busulfan,cyclophosphamide,and fludarabine for a modified myeloablative regimen in this prospective,multicenter cohort study (hereafter referred to as the "DEC/IDA study").

关键词： TRANSPLANTATION