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Direct drop-casting synthesis of all-inorganic lead and lead-free halide perovskite microcrystals for high-performance photodetectors

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Nano Research 2022年第4期15卷 3621-3627页

作者： zhengxun lai You Meng Fei Wang Xiuming Bu Wei Wang Pengshan Xie Weijun Wang Chuntai Liu SenPo Yip Johnny C.Ho Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong 999077China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130021China State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong 999077China Key Laboratory of Advanced Materials Processing&Mold(Zhengzhou University) Ministry of EducationZhengzhou 450002China Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka 816–8580Japan

Due to the exciting photoelectric properties,better stability,and environmental-friendly nature,all-inorganic halide perovskites(AIHPs),especially the lead-free perovskites,have attracted worldwide ***,the film quality of AIHPs fabricated by typical spin-coating and subsequent high-temperature annealing is still not satisfactory,restricting their further ***,we demonstrate a simple low-temperature solution-processed drop-casting method to achieve highly-crystalline cubic CsPbBr_(3)and lead-free layer-structured Cs_(3)Sb_(2)I_(9)microcrystals(MCs).This drop-casting technique not only consumes the less amount of precursor solution but also eliminates the high-temperature annealing as compared with those of spin *** these MCs are configured into photodetectors,they exhibit superior device performance,which is in distinct contrast to the one of spin-coated ***,the responsivity of CsPbBr_(3)MCs is found to be as large as 8,990 mA/W,being 13 times larger than the spin-coated films and even better than many state-of-the-art solution-processed AIHPs *** device performance enhancement is attributed to the better film quality and phase purity obtained by the drop-casting *** these results can evidently fill the“technology gap”for further enhancing the material quality of solution-processed AIHPs and breaking down the barriers that hinder the development of AIHPs based optoelectronic devices.

关键词： halide perovskite drop-casting photodetector CsPbBr_(3) Cs_(3)Sb_(2)I_(9)

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High-performance photodetectors based on two-dimensional perovskite crystals with alternating interlayer cations

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Journal of Materiomics 2023年第4期9卷 817-823页

作者： Yezhan Li zhengxun lai You Meng Wei Wang Yuxuan Zhang Xuwen Zhao Di Yin Weijun Wang Pengshan Xie Quan Quan SenPo Yip Johnny C.Ho Department of Materials Science and Engineering City University of Hong Kong999077Hong Kong SARChina Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka816-8580Japan State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong999077Hong Kong SARChina

Organic-inorganic halide perovskite,as a low-cost,solution-processable material with remarkable optoelectronic properties,is ideal candidate to fabricate high-performance photodetectors and is expected to significantly reduce device *** to the common Dion-Jacobson and Ruddlesden-Popper two-dimensional(2D)layered hybrid perovskite compounds,the perovskites with alternating cations in the interlayer(ACI)phase show higher crystal symmetry and narrower optical bandgaps,which exhibit great potential for excellent photodetection ***,we report a high-performance photodetector based on the 2D bilayered hybrid lead halide perovskite single crystal with the ACI phase(GAMA_(2)Pb_(2)I_(7);GA=C(NH_(2))_(3)and MA=CH_(3)NH_(3)).The single-crystal photodetector exhibits high photoresponsivity of 1.56,2.54,and 2.60 A/W for incident light wavelengths of 405,532,and 635 nm under 9.82 nW,respectively,together with the correspondingly high detectivity values of 1.86×10^(12),3.04×10^(12),and 3.11×10^(12)Jones under the same operating ***,a high-resolution imaging sensor is built based on the GAMA_(2)Pb_(2)I_(7)single-crystal photodetector,confirming the high stability and photosensitivity of the imaging *** results show that the 2D hybrid lead halide perovskites with alternating interlayer cations are promising for high-performance visible light photodetectors and imaging systems.

关键词： Photodetector Two-dimensional Hybrid perovskite Alternating interlayer cation Imaging

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Crystalline all-inorganic lead-free Cs_(3)Sb_(2)I_(9) perovskite microplates with ultra-fast photoconductive response and robust thermal stability

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Nano Research 2021年第11期14卷 4116-4124页

作者： Sujit Kumer Shil Fei Wang zhengxun lai You Meng Yunpeng Wang Dongxu Zhao Mohammad Kamal Hossain Kingsley O.Egbo Ying Wang Kin Man Yu Johnny C.Ho Department of Physics City University of Hong KongKowloonHong KongChina Department of Materials Science and Engineering City University of Hong KongKowloonHong KongChina Department of Physics Khulna University of Engineering&Technology(KUET)Khulna9203Bangladesh State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences3888 Dongnanhu RoadChangchun130021China State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong KongChina Department of Physics Comilla UniversityKotbariComilla3506Bangladesh

Hybrid organolead halide perovskites have attracted tremendous attention due to their recent success as high efficiency solar cell materials and their fascinating material properties uniquely suitable for optoelectronic devices. However, the poor ambient and operational stability as well as the concern of lead toxicity greatly hamper their practical utilization. In this work, crystalline, all-inorganic and lead-free Cs_(3)Sb_(2)I_(9) perovskite microplates are successfully synthesized by a two-step chemical vapor deposition method. As compared with other typical lead-free perovskite materials, the Cs_(3)Sb_(2)I_(9) microplates demonstrate excellent optoelectronic properties, including substantial enhancements in the Stokes shift, exciton binding energy and electron-phonon coupling. Simple photoconductive devices fabricated using these microplates exhibit an ultra-fast response with the rise and decay time constants down to 96 and 58 µs, respectively. This respectable photoconductor performance can be regarded as a record among all the lead-free perovskite materials. Importantly, these photodetectors show superior thermal stability in a wide temperature range, capable to function reversibly between 80 and 380 K, indicating their robustness to operate under both low and high temperatures. All these results evidently suggest the technological potential of inorganic lead-free Cs_(3)Sb_(2)I_(9) perovskite microplates for next-generation high-performance optoelectronic devices.

关键词： all-inorganic lead-free perovskites Cs_(3)Sb_(2)I_(9) microplates photoresponse stability

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Atomic origin of spin-valve magnetoresistance at the SrRuO3 grain boundary

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National Science Review 2020年第4期7卷 755-762页

作者： Xujing Li Li Yin zhengxun lai Mei Wu Yu Sheng Lei Zhang Yuanwei Sun Shulin Chen Xiaomei Li Jingmin Zhang Yuehui Li Kaihui Liu Kaiyou Wang Dapeng Yu Xuedong Bai Wenbo Mi Peng Gao Electron Microscopy Laboratory School of Physics Peking University Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology School of Science Tianjin University International Center for Quantum Materials Peking University State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences State Key Laboratory for Artificial Microstructure & Mesoscopic Physics School of Physics Peking University Collaborative Innovation Centre of Quantum Matter College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology

Defects exist ubiquitously in crystal materials, and usually exhibit a very different nature from the bulk ***, their presence can have significant impacts on the properties of *** it is well accepted that the properties of defects are determined by their unique atomic environments, the precise knowledge of such relationships is far from clear for most oxides because of the complexity of defects and difficulties in ***, we fabricate a 36.8°Sr RuO3grain boundary of which the transport measurements show a spin-valve *** identify its atomic arrangement, including oxygen,using scanning transmission electron microscopy and *** on the as-obtained atomic structure, the density functional theory calculations suggest that the spin-valve magnetoresistance occurs because of dramatically reduced magnetic moments at the *** ability to manipulate magnetic properties at the nanometer scale via defect control allows new strategies to design magnetic/electronic devices with low-dimensional magnetic order.

关键词： spin-valve magnetic defects electron microscopy grain boundary

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Solution-processed lead-free double perovskite microplatelets with enhanced photoresponse and thermal stability

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Science China Materials 2022年第5期65卷 1313-1319页

作者： zhengxun lai Fei Wang You Meng Xiuming Bu Xiaolin Kang Quan Quan Wei Wang SenPo Yip Chuntai Liu Johnny C.Ho Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong Kong SARChina State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130021China State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloon 999077Hong Kong SARChina Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka 816-8580Japan Key Laboratory of Advanced Materials Processing&Mold(Ministry of Education) Zhengzhou UniversityZhengzhou 450002China

Due to the better stability and environmentfriendly nature,lead-free halide double perovskites are widely explored as promising materials for next-generation photovoltaics and optoelectronics;however,to date,their photoelectric device performance is still not ***,we report a facile solution-process method to synthesize the recently most popular lead-free halide double perovskite,MA_(2)Ag Bi Br_(6),and its all-inorganic counterpart,Cs_(2)Ag Bi Br_(6).The obtained MA_(2)Ag Bi Br_(6)and Cs_(2)Ag Bi Br_(6)films exhibit the microplatelet morphology with excellent crystallinity,distinctly contrasting the ones fabricated by the conventional spin-coating *** fabricated into simple photodetectors,the Cs_(2)Ag Bi Br_(6)microplatelet devices yield a respectable responsivity of 245 m A W^(-1) that is two orders of magnitude larger than that of the spin-coated *** importantly,the response speed of the Cs_(2)Ag Bi Br_(6)microplatelets device is as fast as 145μs,which is higher than most of the values reported in the community of halide double *** subjected to the thermal stability testing,the Cs_(2)Ag Bi Br_(6)microplatelet device can maintain its initial performance after heating to 160℃ and cooling down to room temperature in the ambient *** these results suggest that the facile solution-process method is capable of fabricating high-quality lead-free double perovskites,enabling their advanced device applications.

关键词： lead-free double perovskite Cs_(2)AgBiBr_(6) MA_(2)AgBiBr_(6) thermal stability photodetector

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