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| 1 | Low-Dimensional Halide Perovskites and Their Advanced Optoelectronic Applications显示文摘Metal halide perovskites are crystalline materials originally developed out of scientific curiosity. They have shown great potential as active materials in optoelectronic applications. In the last 6 years, their certified photovoltaic efficiencies have reached 22.1%. Compared to bulk halide perovskites, low-dimensional ones exhibited novel physical properties. The photoluminescence quantum yields of perovskite quantum dots are close to 100%. The external quantum efficiencies and current efficiencies of perovskite quantum dot light-emitting diodes have reached 8% and 43 cd A^(-1),respectively, and their nanowire lasers show ultralow-threshold room-temperature lasing with emission tunability and ease of synthesis. Perovskite nanowire photodetectors reached a responsivity of 10 A W^(-1)and a specific normalized detectivity of the order of 10^(12 )Jones. Different from most reported reviews focusing on photovoltaic applications, we summarize the rapid progress in the study of low-dimensional perovskite materials, as well as their promising applications in optoelectronic devices. In particular, we review the wide tunability of fabrication methods and the state-of-the-art research outputs of low-dimensional perovskite optoelectronic devices. Finally, the anticipated challenges and potential for this exciting research are proposed. | Jian Zhang Xiaokun Yang Hui Deng Keke Qiao Umar Farooq Muhammad Ishaq Fei Yi Huan Liu Jiang Tang Haisheng Song | 2017 | Nano-Micro Letters2017，9，3： | 10 |
| 2 | Large piezoelectric response in a family of metal-free perovskite ferroelectric compounds from first-principles calculations显示文摘Metal-free organic perovskite ferroelectric materials have been shown recently to have a number of attractive properties,including high spontaneous polarization and piezoelectric coefficients.In particular,slow evaporation of solutions containing organic amines,inorganic ammoniums,and dilute hydrohalogen acid has been shown to produce several attractive materials in the MDABCO-NH_(4)-I_(3) family(MDABCO is N-methyl-N’-diazabicyclo[2,2,2]octonium).In the present work,we study by first-principles calculations the origin of polarizaiton,electronic density of state,piezoelectric response,and elastic properties of MDABCO-NH_(4)-X_(3)(X=Cl,Br,I).We find that the dipole moments of the MDABCO and NH_(4) groups are negligible,and the large spontaneous polarization of MDABCONH_(4)-I_(3) mainly results from MDABCO and NH_(4) being off-center relative to I ions.Although the piezoelectric response of organic materials is usually very weak,we observe large piezoelectric strain components,d_(x4) and d_(x5);the calculated d_(x5) is 119 pC/N for MDABCO-NH_(4)-Cl_(3),248 pC/N for MDABCO-NH_(4)-Br_(3) and 178 pC/N for MDABCO-NH_(4)-I_(3).The large value of dx5 is found to be closely related with the large value of elastic compliance tensor,s44.These results show that MDABCO-NH_(4)-X_(3) metal-free organic perovskites have large piezoelectric response with soft elastic properties. | Hui Wang Huihui Liu Zeyu Zhang Zihan Liu Zhenlong Lv Tongwei Li Weiwei Ju Haisheng Li Xiaowu Cai Han Han | 2019 | npj Computational Materials2019，，1： | 3 |
| 3 | The calibration and initial results of the HeI D3 line flash spectrum obtained during the 2008 total solar eclipse显示文摘The flash spectra in the HeI D3 line were obtained during the 2008 total solar eclipse. This paper describes the instrument and the calibration of the obtained flash spectrum, and presents our initial results. The average integrated intensity is Eave = 8.13×1013 erg·cm-1· s-1·ster-1 at h = 1100 km, which confirms that the HeI D3 emission is negatively correlated with the solar activity. The surface brightness reaches a maximum of F ave = 8.25×105 erg·cm-2·s-1·ster-1 at about h ≈ (1290 ± 75) km and then decreases exponentially with height when h >1800 km with an exponential index β = 1.63×10-8 cm-1. | LI Hui JI HaiSheng NI HouKun ZHANG HaiYing ZHANG YaNan LIU HongRui DENG YuanYong WANG DongGuang DU QiuSheng ZHOU TuanHui LI JingWei SHEN JinHua | 2009 | Science China(Physics,Mechanics & Astronomy)2009，52，11： | 2 |
| 4 | Hydroiodic Acid Additive Enhanced the Performance and Stability of PbS-QDs Solar Cells via Suppressing Hydroxyl Ligand显示文摘The recent emerging progress of quantum dot ink(QD-ink)has overcome the complexity of multiple-step colloidal QD(CQD)film preparation and pronouncedly promoted the device performance.However,the detrimental hydroxyl(OH)ligands induced from synthesis procedure have not been completely removed.Here,a halide ligand additive strategy was devised to optimize QD-ink process.It simultaneously reduced sub-bandgap states and converted them into iodide-passivated surface,which increase carrier mobility of the QDs films and achieve thicker absorber with improved performances.The corresponding power conversion efficiency of this optimized device reached 10.78%.(The control device was 9.56%.)Therefore,this stratege can support as a candidate strategy to solve the QD original limitation caused by hydroxyl ligands,which is also compatible with other CQD-based optoelectronic devices. | Xiaokun Yang Ji Yang Jahangeer Khan Hui Deng Shengjie Yuan Jian Zhang Yong Xia Feng Deng Xue Zhou Farooq Umar Zhixin Jin Haisheng Song Chun Cheng Mohamed Sabry Jiang Tang | 2020 | Nano-Micro Letters2020，12，3： | 2 |
| 5 | A new sediment type of coated grain: Oolitic sinter显示文摘As a special sedimentary grain type, the coated grain(with an ooid model) has been known for two centuries due to its fascinating special fabric and genesis developments. The leading factors in forming the coated grain consist mainly of:(1) microorganism movement field;(2) chemical sedimentary effect;(3) hydrodynamic force environment and topography condition;(4) abundant core material supply;(5) embedding condition; and(6) humic acids condition in water medium. With the development of the coated grain genesis, the single factor theory cannot reasonably explain the exact formation of the surface sediment of coated grain. Here, we find a new way to study the coated grain on the basis of traditional research methods. The Wenquan area on the northeast edge of the Qiangtang Basin is one of the few areas where the coated grain is developing, and is a rare 'natural laboratory' for the study of the coated grain and the thermal spring sediment. The oolitic sinter of the area has the triaxiality modality of pea polymer, and is obviously different from the karst travertine and the normal lacustrine ooid. We found that the hot spring water in the Wenquan area has higher partial pressure of CO2(PCO2) and saturation index of the calcite(SIc) than normal. Macrocosmically, the oolitic sinter is shaped like a pea, and its grains and gap fillings are light yellow. Microcosmically, the sinter grain forms six types of fundamental lamina, and those six types are developed to be four grain types with different combinations. The C-axis of the mineral grain of sinter cement(calcite) is normal to the lamina face, and grows on it with distinct generation formations. In short, the grain type of oolitic sinter is the oncoid, with the grain development caused by the factors such as the shallow water of strong hydrodynamic force, the special hydrochemistry condition, and the extensive algae activities(diatom). | WU ChiHua YI HaiSheng HUI Bo XIA GuoQing MA Xue | 2014 | Science China Earth Sciences2014，57，9： | 1 |
| 6 | Improving the Performance of PbS Quantum Dot Solar Cells by Optimizing ZnO Window Layer显示文摘Comparing with hot researches in absorber layer,window layer has attracted less attention in PbS quantum dot solar cells(QD SCs). Actually, the window layer plays a key role in exciton separation, charge drifting, and so on.Herein, ZnO window layer was systematically investigated for its roles in QD SCs performance. The physical mechanism of improved performance was also explored. It was found that the optimized ZnO films with appropriate thickness and doping concentration can balance the optical and electrical properties, and its energy band align well with the absorber layer for efficient charge extraction. Further characterizations demonstrated that the window layer optimization can help to reduce the surface defects, improve the heterojunction quality, as well as extend the depletion width. Compared with the control devices, the optimized devices have obtained an efficiency of 6.7% with an enhanced V_(oc) of 18%, J_(sc) of 21%, FF of 10%, and power conversion efficiency of 58%. The present work suggests a useful strategy to improve the device performance by optimizing the window layer besides the absorber layer. | Xiaokun Yang Long Hu Hui Deng Keke Qiao Chao Hu Zhiyong Liu Shengjie Yuan Jahangeer Khan Dengbing Li Jiang Tang Haisheng Song Chun Cheng | 2017 | Nano-Micro Letters2017，9，2： | 0 |
| 7 | Geometric Mean Maximum FSVMI Model and Its Application in Carotid Artery Stenosis Risk Prediction显示文摘Carotid artery stenosis is a serious medical condition that can lead to stroke.Using machine learning method to construct classifier model,carotid artery stenosis can be diagnosed with transcranial doppler data.We propose an improved fuzzy support vector machine model to predict carotid artery stenosis,with the maximum geometric mean as the optimization target.The fuzzy membership function is obtained by combining information entropy with the normalized class-center distance.Experimental results showed that the proposed model was superior to the benchmark models in sensitivity and geometric mean criteria. | ZHANG Xueying GUO Yuling LI Fenglian WEI Xin HU Fengyun HUI Haisheng JIA Wenhui | 2021 | Chinese Journal of Electronics2021，30，5： | 0 |
| 8 | Sb_(2)Se_(3) film with grain size over 10μm toward X-ray detection显示文摘Direct X-ray detectors are considered as competitive next-generation X-ray detectors because of their high spatial resolution,high sensitivity,and simple device configuration.However,their potential is largely limited by the imperfections of traditional materials,such as the low crystallization temperature of α-Se and the low atomic numbers of α-Si and α-Se.Here,we report the Sb_(2)Se_(3) X-ray thin-film detector with a p-n junction structure,which exhibited a sensitivity of 106.3 μC/(Gyair·cm^(2))and response time of<2.5 ms.This decent performance and the various advantages of Sb_(2)Se_(3),such as the average atomic number of 40.8 and μτ product(μ is the mobility,and τ is the carrier lifetime)of 1.29×1O^(-5) cm^(2)/V,indicate its potential for application in X-ray detection. | Chong WANG Xinyuan DU Siyu WANG Hui DENG Chao CHEN Guangda NIU Jincong PANG Kanghua LI Shuaicheng LU Xuetian LIN Haisheng SONG Jiang TANG | 2021 | Frontiers of Optoelectronics2021，14，3： | 0 |
| 9 | Differentially Authorized Deduplication System Based on Blockchain显示文摘In architecture of cloud storage, the deduplication technology encrypted with theconvergent key is one of the important data compression technologies, which effectively improvesthe utilization of space and bandwidth. To further refine the usage scenarios for varioususer permissions and enhance user’s data security, we propose a blockchain-based differentialauthorized deduplication system. The proposed system optimizes the traditionalProof of Vote (PoV) consensus algorithm and simplifies the existing differential authorizationprocess to realize credible management and dynamic update of authority. Based on thedecentralized property of blockchain, we overcome the centralized single point fault problemof traditional differentially authorized deduplication system. Besides, the operations oflegitimate users are recorded in blocks to ensure the traceability of behaviors. | ZHAO Tian LI Hui YANG Xin WANG Han ZENG Ming GUO Haisheng WANG Dezheng | 2021 | ZTE Communications2021，19，2： | 0 |
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