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| 1 | High-definition colorful perovskite narrowband photodetector array enabled by laser-direct-writing显示文摘Narrowband photodetectors as specific spectral sensing pixels have drawn intense attention in multispectral detection due to their distinct characteristic of filter-free spectrum discrimination,in which the emerging halide lead perovskites witness a booming development in their performance and wavelength-selectivity from blue to near-infrared light.However,the challenge in integrating perovskite narrowband photodetectors on one chip imposes an impediment on practical application.In this work,the combination of laser-direct-writing and ion exchange is proposed as an efficient way to fabricate high-definition colorful sensing array with perovskite narrowband photodetector unit as pixel.Under laser irradiation,the photolysis of halocarbon solvent(CHCl_(3),CH_(3)CH_(2)I,etc)releases the halide ions,which brings the ion exchange and gives rise to slow-varying bandgap in single perovskite photoactive film.This ion exchange can be controlled via laser irradiation time and focus point,thus enabling precisely engineerable bandgap.By optimizing the process,it is successfully applied to develop patterned perovskite narrow blue and green photodetectors array with a high-definition of~53 ppi.We believe this result will make a great step forward to integrate multifunctional perovskite devices on one chip,which will pave the way for perovskite optoelectronic device to the commercial application. | Xiaobao Xu Yuhang Dong Yuanzhou Zhang Zeyao Han Jiaxin Liu Dejian Yu Yi Wei Yousheng Zou Bo Huang Jun Chen Haibo Zeng | 2022 | Nano Research2022，15，6： | 2 |
| 2 | Parallel Simulation of Groundwater Flow in the North China Plain显示文摘Numerical modeling is of crucial importance in understanding the behavior of regional groundwater system. However, the demand on modeling capability is intensive when performing high-resolution simulation over long time span. This paper presents the application of a parallel program to speed up the detailed modeling of the groundwater flow system in the North China Plain. The parallel program is implemented by rebuilding the well-known MODFLOW program on our parallelcomputing framework, which is achieved by designing patch-based parallel data structures and algorithms but maintaining the compute flow and functionalities of MODFLOW. The detailed model with more than one million grids and a decade of time has been solved. The parallel simulation results were examined against the field observed data and these two data are generally in good agreement. For the comparison on solution time, the parallel program running on 32 cores is 6 times faster than the fastest MICCG-based MODFLOW program and 11 times faster than the GMG-based MODFLOW program. Therefore, remarkable computational time can be saved when using the parallel program, which facilitates the rapid modeling and prediction of the groundwater flow system in the North China Plain. | Tangpei Cheng Jingli Shao Yali Cui Zeyao Mo Zhong Han Ling Li | 2014 | Journal of Earth Science2014，25，6： | 1 |
| 3 | Broadband and sensitive two-dimensional halide perovskite photodetector for full-spectrum underwater optical communication显示文摘Full-spectrum underwater optical communication(UOC)is of great significance for major strategic needs including resource development,scientific exploration,and homeland security.As the core of the full-spectrum UOC system,photodetectors(PDs)are plagued by stringent requirements including a broadband response,intrinsic water resistance,and a high detectivity.In this work,two-dimensional(2D)halide perovskites(HPs)and corresponding PDs are constructed by stearamine(SA),representing the rarely explored long-chain aliphatic amine series,to own waterproofness,ultralow noise,and superior optoelectronic performance,which consequently enable a high suitability for UOC.By dimensionality and composition modulations to extend the absorption onset down to 1.5 eV,a broadband response covering the entire transmission window of water(>1.55 eV)for full-spectrum UOC can be obtained.Besides,featuring a high responsivity of 3.27 A·W^(-1),a peak external quantum efficiency(EQE)of 630%,fast rise/decay times of 0.35 ms/0.54 ms,a superior detectivity up to 1.35×10^(12)Jones and the capability to distinguish various waveforms and light intensities,the PDs present sensitive and persistent photoresponse underwater.As a result,proof-of-concept wireless transmission of ASCII codes in water is demonstrated. | Dejian Yu Fei Cao Yu Gu Zeyao Han Jiaxin Liu Bo Huang Xiaobao Xu Haibo Zeng | 2021 | Nano Research2021，14，4： | 1 |
| 4 | Material patterning on substrates by manipulation of fluidic behavior显示文摘Patterned materials on substrates are of great importance for a wide variety of applications.In solution-based approaches to material patterning;fluidic flow is inevitable.Here we demonstrate not only the importance of fluidic behavior but also the methodology of engineering the flow pattern to guide the material crystallization and assembly.We show by both experiment and simulation that substrate heating;which is generally used to accelerate evaporation,produces irregular complex vortexes.Instead;a top-heating-bottom-cooling(THBC)set-up offers an inverse temperature gradient and results in a single Marangoni vortex,which is desired for ordered nanomaterial patterning near the contact line.We then realize the fabrication of large-scale patterns of iodide perovskite crystals on different substrates under THBC conditions.We further demonstrate that harnessing the flow behavior is a general strategy with great feasibility to pattern various functional materials ranging from inorganic;organic,hybrid to biological categories on different substrates,presenting great potential for practical applications. | Yitan Li Hao Wang Henglu Xu Shiting Wu Xuemei Li Jiapeng Yu Chaoyu Huang Zeyao Zhang Hao Sun Lu Han Meihui Li Anyuan Cao Zhenhai Pan Yan Li | 2019 | National Science Review2019，6，4： | 0 |
| 5 | An asymmetric A-D-π-A type non-fullerene acceptor enables high-detectivity near-infrared organic photodiodes显示文摘Narrow bandgap non-fullerene acceptors(NFAs)are relevant as key materials components for the fabrication of near-infrared(NIR)organic solar cells(OSCs)and organic photodiodes(OPDs)thanks to their complementary absorption,tunable energy levels,and enhanced stability.However,high-performance NIR photodetectors are still scarce due to the absence of narrow bandgap NFAs.Herein,an asymmetric A-D-π-A type NFA,named ABTPV-S,with a broad optical absorption approaching 1,000 nm is designed and synthesized through integrating alkylthio side chains and a vinyleneπ-bridge.The optimal inverted OPD device exhibits an excellent performance with a photoresponsivity of 0.39 AW-1,a noise current of 2.25×10^(-14)A Hz^(-0.5),a specific detectivity(D*)of 3.43×10^(12)Jones at 840 nm,and linear dynamic range(LDR)of 140 d B.In addition,the rise and fall times for ABTPV-S-based OPDs also reach 1.07 and 0.71μs,respectively.ABTPV-S-based OPDs exhibit a high D*over 1012Jones at 950 nm,which is a competitive result for the self-powered photodiode-type NIR OPDs.These findings highlight the outstanding potential of asymmetric A-D-π-A type NIR NFAs for high-performance OPDs competing with their silicon counterparts. | Ziping Zhong Xin Liu Ling Li Zeyao Han Yin He Xiaobao Xu Jiefeng Hai Rihong Zhu Jiangsheng Yu | 2023 | Science China Chemistry2023，66，1： | 0 |
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