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学者姓名：张永哲
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摘要 ：
The polarization singularities in momentum space, rather than in real space, are capturing interest for active singular optics with exotic light scattering and various topological phenomena, which have potential applications in vortex nano-lasers, valley exciton emission, and others. Here, we propose to magnetically control the polarization singularities in momentum space in the photonic crystal slabs with inversion spatial symmetry (P symmetry). A pair of C points (circular polarization points) with the same topological charge is spawned from a V point (polarization vortex center), and they can be dynamically shifted in momentum space with the variation of the magnetic field. Moreover, the coupling between transverse electric (TE) and transverse magnetic (TM) modes induced by the magnetic field gives rise to a hybrid mode, which can close certain leaky channels to achieve an accidentalVpoint. Such active manipulation of polarization singularities with magnetic field is promised for various applications in light-matter interactions and reveals novel phenomena and physics in singular optics and topological photonics. (C) 2022 Optica Publishing Group
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| GB/T 7714 | Zhao, Chen , Dong, Shaohua , Zhang, Qing et al. Magnetic modulation of topological polarization singularities in momentum space [J]. | OPTICS LETTERS , 2022 , 47 (11) : 2754-2757 . |
| MLA | Zhao, Chen et al. "Magnetic modulation of topological polarization singularities in momentum space" . | OPTICS LETTERS 47 . 11 (2022) : 2754-2757 . |
| APA | Zhao, Chen , Dong, Shaohua , Zhang, Qing , Zeng, Yixuan , Hu, Guangwei , Zhang, Yongzhe . Magnetic modulation of topological polarization singularities in momentum space . | OPTICS LETTERS , 2022 , 47 (11) , 2754-2757 . |
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摘要 ：
Lead sulfide colloidal quantum dots (PbS CQDs) have shown great potential in photodetectors owing to their promising optical properties, especially their strong and tunable absorption. However, the limitation of the specific detectivity (D*) in CQD near-infrared (NIR) photodetectors remains unknown due to the ambiguous noise analysis. Therefore, a dear understanding of the noise current is critically demanded. Here, we elucidate that the noise current is the predominant factor limiting D*, and the noise is highly dependent on the trap densities in halide-passivated PbS films and the carriers injected from the Schottky contact (EDT-passivated PbS films/metal). It is found that the thickness of CQDs is proportional to their interface trap density, while it is inversely proportional to their minimal bulk trap density. A balance point can be reached at a certain thickness (136 nm) to minimize the trap density, giving rise to the improvement of D*. Utilizing thicker PbS-EDT films broadens the width of the tunneling barrier and thereby reduces the carrier injection, contributing to a further enhancement of D*. The limiting factors of D* determined in this work not only explain the physical mechanism of the influence on detection sensitivity but also give guidance to the design of high-performance CQD photodetectors.
关键词 ：
noise current noise current charge carrier injection charge carrier injection rap density rap density colloidal quantum dots colloidal quantum dots near-infrared imaging specific detectivity near-infrared imaging specific detectivity
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| GB/T 7714 | Gong, Wei , Wang, Peng , Deng, Wenjie et al. Limiting Factors of Detectivity in Near-Infrared Colloidal Quantum Dot Photodetectors [J]. | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (22) : 25812-25823 . |
| MLA | Gong, Wei et al. "Limiting Factors of Detectivity in Near-Infrared Colloidal Quantum Dot Photodetectors" . | ACS APPLIED MATERIALS & INTERFACES 14 . 22 (2022) : 25812-25823 . |
| APA | Gong, Wei , Wang, Peng , Deng, Wenjie , Zhang, Xiaobo , An, Boxing , Li, Jingjie et al. Limiting Factors of Detectivity in Near-Infrared Colloidal Quantum Dot Photodetectors . | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (22) , 25812-25823 . |
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摘要 ：
The ultrathin feature of two-dimensional (2D) transition metal dichalcogenides (TMDs) has brought special performance in electronic and optoelectronic fields. When vertical and lateral heterojunctions are made using different TMD combinations, the original properties of premier TMDs can be optimized. Especially for lateral heterojunctions, their sharp interface signifies a narrow space charge region, leading to a strong in-plane built-in electric field, which may contribute to high separation efficiency of photogenerated carriers, good rectification behavior, self-powered photoelectric device construction, etc. However, due to the poor controllability over the synthesis process, obtaining a clean and sharp interface of the lateral heterojunction is still a challenge. Herein, we propose a simple chemical vapor deposition (CVD) method, which can effectively separate the growth process of different TMDs, thus resulting in good regulation of the composition change at the junction region. By this method, MoS2-WS2 lateral heterojunctions with sharp interfaces have been obtained with good rectification characteristics, similar to 105 on/off ratio, 1874% external quantum efficiency, and similar to 120 ms photoresponse speed, exhibiting a better photoelectric performance than that of the lateral ones with graded junctions.
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| GB/T 7714 | Li, Jingtao , Ma, Yang , Li, Yufo et al. Interface Influence on the Photoelectric Performance of Transition Metal Dichalcogenide Lateral Heterojunctions [J]. | ACS OMEGA , 2022 . |
| MLA | Li, Jingtao et al. "Interface Influence on the Photoelectric Performance of Transition Metal Dichalcogenide Lateral Heterojunctions" . | ACS OMEGA (2022) . |
| APA | Li, Jingtao , Ma, Yang , Li, Yufo , Li, Shao-Sian , An, Boxing , Li, Jingjie et al. Interface Influence on the Photoelectric Performance of Transition Metal Dichalcogenide Lateral Heterojunctions . | ACS OMEGA , 2022 . |
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摘要 ：
Organic-inorganic perovskite single crystals are promising in the field of optoelectronics due to their excellent optoelectronic properties. However, the ion transport of perovskite precursor is poor in confined spaces, which results in difficulty in the preparation of perovskite single-crystal films. Herein, MAPbBr3 films consisting of square grains were fabricated by the surface-confined process using the organic molecule PEAI (phenethylammonium iodide). Under the effect of oversaturation gradient, PEA+ is combined with the surface of perovskite grain from top to side, which constrains the lateral growth of grains and induces a downward growth of perovskite, leading to the formation of square grains. With the improvement of concentration PEAI, the perovskite film exhibits a decreased side length of grains (from 0.98 to 12.96 μm) and increased grain number and coverage, as well as crystallinity. The perovskite single crystalline grain films with PEAI showed double photoluminescence (PL) emission peaks due to the existence of iodine-rich perovskite. This work may provide a practical way to fabricate high-quality perovskite films for perovskite photoelectronic devices.
关键词 ：
MAPbBr3 MAPbBr3 perovskite perovskite phenethylammonium iodide (PEAI) phenethylammonium iodide (PEAI) single crystal single crystal surface-confined process surface-confined process
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| GB/T 7714 | Yan Shao Xin , Han Chang Bao , Huang Jianhua et al. Organic Molecule Assisted Growth of Perovskite Films Consisting of Square Grains by Surface-Confined Process. [J]. | Nanomaterials , 2021 , 11 (2) . |
| MLA | Yan Shao Xin et al. "Organic Molecule Assisted Growth of Perovskite Films Consisting of Square Grains by Surface-Confined Process." . | Nanomaterials 11 . 2 (2021) . |
| APA | Yan Shao Xin , Han Chang Bao , Huang Jianhua , Chen Yichuan , Zhang Xiaobo , Chen Xiaoqing et al. Organic Molecule Assisted Growth of Perovskite Films Consisting of Square Grains by Surface-Confined Process. . | Nanomaterials , 2021 , 11 (2) . |
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摘要 ：
高校基层党组织广泛植根于高校教育和教学科研的最前沿,与广大高校师生有着最为紧密的联系,基层党建工作开展得是否入脑入心对高校落实好“培养什么人、怎样培养人、为谁培养人”起着重要的作用.结合现有高校教师党支郎书记选配现状及面临的挑战,总结了“双带头人”教师党支部书记的特点及优势,并以一个高校“双带头人”教师党支部书记工作室为例,探索出一套可示范推广的工作机制和工作方法.
关键词 ：
工作机制 工作机制 党支部书记 党支部书记 双带头人 双带头人
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| GB/T 7714 | 王丽梅 , 张永哲 , 刘玮 . 高校“双带头人”教师党支部书记工作室工作机制探索 [J]. | 北京教育（高教版） , 2021 , (3) : 74-76 . |
| MLA | 王丽梅 et al. "高校“双带头人”教师党支部书记工作室工作机制探索" . | 北京教育（高教版） 3 (2021) : 74-76 . |
| APA | 王丽梅 , 张永哲 , 刘玮 . 高校“双带头人”教师党支部书记工作室工作机制探索 . | 北京教育（高教版） , 2021 , (3) , 74-76 . |
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摘要 ：
高校基层党组织广泛植根于高校教育和教学科研的最前沿,与广大高校师生有着最为紧密的联系,基层党建工作开展得是否入脑入心对高校落实好"培养什么人、怎样培养人、为谁培养人"起着重要的作用。结合现有高校教师党支部书记选配现状及面临的挑战,总结了"双带头人"教师党支部书记的特点及优势,并以一个高校"双带头人"教师党支部书记工作室为例,探索出一套可示范推广的工作机制和工作方法。
关键词 ：
党支部书记 党支部书记 双带头人 双带头人 工作机制 工作机制
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| GB/T 7714 | 王丽梅 , 张永哲 , 刘玮 . 高校“双带头人”教师党支部书记工作室工作机制探索 [J]. | 北京教育(高教) , 2021 , (03) : 74-76 . |
| MLA | 王丽梅 et al. "高校“双带头人”教师党支部书记工作室工作机制探索" . | 北京教育(高教) 03 (2021) : 74-76 . |
| APA | 王丽梅 , 张永哲 , 刘玮 . 高校“双带头人”教师党支部书记工作室工作机制探索 . | 北京教育(高教) , 2021 , (03) , 74-76 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
高校“双带头人”教师党支部书记工作室工作机制探索
关键词 ：
党支部书记 党支部书记 双带头人 双带头人 工作机制 工作机制
引用：
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| GB/T 7714 | 王丽梅 , 张永哲 , 刘玮 et al. 高校“双带头人”教师党支部书记工作室工作机制探索 [J]. | 王丽梅 , 2021 , (3) : 74-76 . |
| MLA | 王丽梅 et al. "高校“双带头人”教师党支部书记工作室工作机制探索" . | 王丽梅 3 (2021) : 74-76 . |
| APA | 王丽梅 , 张永哲 , 刘玮 , 北京教育:高教版 . 高校“双带头人”教师党支部书记工作室工作机制探索 . | 王丽梅 , 2021 , (3) , 74-76 . |
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摘要 ：
Imaging sensors as a critical technology are greatly significant in numerous light detection applications including security monitor, smart mobile devices, machine vision, navigation, self-driving, drones and remote sensing etc. In particular, spectral imaging technology such as multispectral and hyperspectral imaging are attracting more and more attention due to the available spectral and spatial information, which provide an opportunity for deeper cognition of the detected object. However, conventional strategy for wavelength sensing by complicated optical system has obstacle in achieving lightweight, low cost, high quality image and high pixel densities. Therefore, new emerging strategies based on the nanomaterials and nanostructures involving filter-assisted and filter-free light detection are explored to achieve precise spectral discrimination. Here, we review the latest advances of these emerging approaches for spectral discrimination. Furthermore, every filter-assisted and filter-free strategy was discussed and compared in detail by analyzing their fundamental physical principles.
关键词 ：
Optical sensors Optical sensors Information filters Information filters Absorption Absorption Spectral discrimination Spectral discrimination Photodetectors Photodetectors photodetector photodetector Optical filters Optical filters nanomaterials nanomaterials nanostructures nanostructures optoelectronic optoelectronic
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| GB/T 7714 | Deng, Wenjie , You, Congya , Zhang, Yongzhe . Spectral Discrimination Sensors Based on Nanomaterials and Nanostructures: A Review [J]. | IEEE SENSORS JOURNAL , 2021 , 21 (4) : 4044-4060 . |
| MLA | Deng, Wenjie et al. "Spectral Discrimination Sensors Based on Nanomaterials and Nanostructures: A Review" . | IEEE SENSORS JOURNAL 21 . 4 (2021) : 4044-4060 . |
| APA | Deng, Wenjie , You, Congya , Zhang, Yongzhe . Spectral Discrimination Sensors Based on Nanomaterials and Nanostructures: A Review . | IEEE SENSORS JOURNAL , 2021 , 21 (4) , 4044-4060 . |
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摘要 ：
The effect of plasma excitation frequency on the performance of intrinsic hydrogenated amorphous silicon (a-Si:H) films and heterojunction solar cells by radio-frequency (RF, 13.56 MHZ) and very-high-frequency (VHF, 40 MHZ) plasma-enhanced chemical vapor deposition (PECVD) have been investigated. The thickness and microstructure of intrinsic a-Si:H films were measured by spectroscopic ellipsometry and Fourier transform infrared spectroscopy (FTIR). The a-Si:H/c-Si interface passivation quality were determined by minority carrier lifetime and transmission electron microscopy (TEM). The current-voltage (I-V) performance of the HJT solar cells were also evaluated. The results reveal that a-Si:H films developed by RF-PECVD with a large area of parallel-plate reactors (> 1 m(2)) exhibit better thickness uniformity, lower microstructure factor, and higher minority carrier lifetimes. Hence HJT solar cells have achieved efficiency of 24.9%, compared with cell efficiency of 24.6% with intrinsic a-Si:H films developed by VHF-PECVD.
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| GB/T 7714 | Wang, Jianqiang , Ru, Xiaoning , Ruan, Tianyu et al. Performance of heterojunction solar cells with different intrinsic a-Si:H thin layers deposited by RF- and VHF-PECVD [J]. | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2021 , 32 (20) : 25327-25331 . |
| MLA | Wang, Jianqiang et al. "Performance of heterojunction solar cells with different intrinsic a-Si:H thin layers deposited by RF- and VHF-PECVD" . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 32 . 20 (2021) : 25327-25331 . |
| APA | Wang, Jianqiang , Ru, Xiaoning , Ruan, Tianyu , Hu, Yunfei , Zhang, Yongzhe , Yan, Hui . Performance of heterojunction solar cells with different intrinsic a-Si:H thin layers deposited by RF- and VHF-PECVD . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2021 , 32 (20) , 25327-25331 . |
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摘要 ：
Silicon heterojunction solar cells are expected to increase their market share in the near future. Qu et al. identify an embedded nanotwin structure at the crystalline silicon/hydrogenated amorphous silicon interface of silicon heterojunction cells that limits the device performance and devise an approach to suppress its formation. The interface of high-quality crystalline silicon/hydrogenated amorphous silicon (c-Si/a-Si:H) is indispensable for achieving the ideal conversion efficiency of Si heterojunction solar cells. Therefore, it is extremely desirable to characterize and control the interface at the atomic scale. Here, we employ spherical aberration-corrected transmission electron microscopy to investigate the atomic structure of the c-Si/a-Si:H interface in high-efficiency Si heterojunction solar cells. Their structural evolution during in situ annealing is visualized at the atomic scale. High-density embedded nanotwins, detrimental to the device performance, are identified in the thin epitaxial layer between c-Si and a-Si:H. The nucleation and formation of these nanotwins are revealed via ex situ and in situ high-resolution transmission electron microscopy. Si heterojunction solar cells with low-density nanotwins are fabricated by introducing an ultra-thin intrinsic a-Si:H buffer layer and show better performance, indicating that the strategy to restrain embedded nanotwins can further enhance the conversion efficiency of Si heterojunction solar cells.
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| GB/T 7714 | Qu, Xianlin , He, Yongcai , Qu, Minghao et al. Identification of embedded nanotwins at c-Si/a-Si:H interface limiting the performance of high-efficiency silicon heterojunction solar cells [J]. | NATURE ENERGY , 2021 , 6 (2) : 194-202 . |
| MLA | Qu, Xianlin et al. "Identification of embedded nanotwins at c-Si/a-Si:H interface limiting the performance of high-efficiency silicon heterojunction solar cells" . | NATURE ENERGY 6 . 2 (2021) : 194-202 . |
| APA | Qu, Xianlin , He, Yongcai , Qu, Minghao , Ruan, Tianyu , Chu, Feihong , Zheng, Zilong et al. Identification of embedded nanotwins at c-Si/a-Si:H interface limiting the performance of high-efficiency silicon heterojunction solar cells . | NATURE ENERGY , 2021 , 6 (2) , 194-202 . |
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