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学者姓名：张永哲
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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 ：
All-inorganic perovskites have emerged in the field of optoelectronic devices for their excellent light absorption and energy conversion efficiencies, as well as their superior stability compared to organic-inorganic perovskites. The two-dimensional (2D) all-inorganic perovskites have a higher exciton binding energy and carrier recombination efficiency than their bulk counterparts due to the quantum confinement effect, which indicts high strong light-matter interactions and is suitable for special integrated optoelectronics such as a micro laser or quick-response photodetector. However, it is difficult to fabricate a 2D large-sized sample with high crystal quality due to the nonlayered structure, which limits its further research and practical application. In this work, based on an atmospheric pressure chemical vapor deposition strategy combining a space-confined method and van der Waals epitaxy, the synergistic effect of these two techniques results in large-sized ultrathin all-inorganic CsPbI3 perovskite nanosheets for which the lateral dimension can exceed 50 mu m while the smallest thickness can reach 3 nm. The high crystal quality of the square-like samples has been confirmed by a microstructure characterization, while the corresponding performances like long carrier life (360 ns), high resistivity, and good stability were also verified, implying great promise for their applications in high-performance integrated optoelectronics. This method may pave the way for a uniform fabrication of other 2D nonlayered materials as well.
关键词 ：
all-inorganic perovskite nanosheet all-inorganic perovskite nanosheet APCVD APCVD integrated optoelectronics integrated optoelectronics space-confined method space-confined method van der Waals epitaxy van der Waals epitaxy
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| GB/T 7714 | He, Yeming , Ma, Yang , Li, Xuhong et al. All-Inorganic Perovskite Nanosheet Fabrication under Synergistic Effect for Integrated Optoelectronics with Strong Light-Matter Interactions [J]. | ACS APPLIED NANO MATERIALS , 2021 , 4 (3) : 2634-2641 . |
| MLA | He, Yeming et al. "All-Inorganic Perovskite Nanosheet Fabrication under Synergistic Effect for Integrated Optoelectronics with Strong Light-Matter Interactions" . | ACS APPLIED NANO MATERIALS 4 . 3 (2021) : 2634-2641 . |
| APA | He, Yeming , Ma, Yang , Li, Xuhong , Zhang, Yongzhe . All-Inorganic Perovskite Nanosheet Fabrication under Synergistic Effect for Integrated Optoelectronics with Strong Light-Matter Interactions . | ACS APPLIED NANO MATERIALS , 2021 , 4 (3) , 2634-2641 . |
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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
引用：
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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 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
As one of the most promising photovoltaic materials, the efficiency of inorganic-organic hybrid halide perovskite solar cells (PSCs) has reached 25.5% in 2020. However, the stability and hysteresis remain primary challenges before it can become a commercial photovoltaic technology. Therefore, those issues have drawn significant attention for photovoltaic applications. In this work, a study of the PSCs hysteresis improvement is presented based on a combination of first-principles simulations, scanning electron microscopy images, and time-dependent photocurrent measurements. It indicates the hysteresis led by the ion migration and accumulation is mainly localized at the two interfaces: one is between electron transport layer and active layer, and the other is between active layer and hole transport layer. Considering the massive defects at the grain boundaries (GBs), they lower the potential barriers significantly. The defect density at GBs is therefore reduced via the in situ passivation of PbI2 crystals. The hysteresis index is decreased from 22.43% down to 1.04%, and results in an improvement in efficiency from 17.12% up to 20.10%. Following the understanding of defect-induced hysteresis, an approach to improve the hysteresis is provided, which can be integrated into the fabrication process and widely applied to enhance the performance of PSCs.
关键词 ：
hysteresis hysteresis in situ X-ray diffraction in situ X-ray diffraction ions migration ions migration time-dependent photocurrent time-dependent photocurrent
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| GB/T 7714 | Chen, Yichuan , Zhou, Wencai , Chen, Xiaoqing et al. In Situ Management of Ions Migration to Control Hysteresis Effect for Planar Heterojunction Perovskite Solar Cells [J]. | ADVANCED FUNCTIONAL MATERIALS , 2021 . |
| MLA | Chen, Yichuan et al. "In Situ Management of Ions Migration to Control Hysteresis Effect for Planar Heterojunction Perovskite Solar Cells" . | ADVANCED FUNCTIONAL MATERIALS (2021) . |
| APA | Chen, Yichuan , Zhou, Wencai , Chen, Xiaoqing , Zhang, Xiaobo , Gao, Hongli , Ouedraogo, Nabonswende Aida Nadege et al. In Situ Management of Ions Migration to Control Hysteresis Effect for Planar Heterojunction Perovskite Solar Cells . | ADVANCED FUNCTIONAL MATERIALS , 2021 . |
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摘要 ：
When the power conversion efficiency (PCE) of perovskite solar cells (PSCs) rapidly approaches that of commercial solar cells, the stability becomes the most important obstacle for the commercialization of PSCs. Aside from the widely studied slow PCE degradation, the PSCs also show a unique rapid PCE degradation. Although the degradation due to oxygen and humidity can be avoided by encapsulation, that due to bias voltage, light and heat could not be effective suppressed and will lead to considerable degradation. Usually, the rapid PCE degradation is believed to be from ion migration. However, a systematic investigation is yet to be carried out. This work quantitatively and systematically investigated the relationships between external fields (bias voltage, light or heat), ion migration and device performance. By comparing the performance of reference PSCs after 90 min degradation under these fields, we conclude that (1) the electric field affects the spatial distribution of mobile ions; (2) the light field changes the mobile ion densities and drives the ion migration; (3) the heat field results in perovskite decomposition as well as changing the mobile ion densities. In addition to the analysis of the reference device, we experimentally proved that the improved device stability upon introducing phenethylammonium iodide (PEAI) or poly-methyl methacrylate (PMMA) layers originates from the inhibition of mobile ion density and migration.
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| GB/T 7714 | Zhang, Xiaobo , Chen, Xiaoqing , Chen, Yichuan et al. Rapid degradation behavior of encapsulated perovskite solar cells under light, bias voltage or heat fields [J]. | NANOSCALE ADVANCES , 2021 , 3 (21) : 6128-6137 . |
| MLA | Zhang, Xiaobo et al. "Rapid degradation behavior of encapsulated perovskite solar cells under light, bias voltage or heat fields" . | NANOSCALE ADVANCES 3 . 21 (2021) : 6128-6137 . |
| APA | Zhang, Xiaobo , Chen, Xiaoqing , Chen, Yichuan , Ouedraogo, Nabonswende Aida Nadege , Li, Jingjie , Bao, Xiulong et al. Rapid degradation behavior of encapsulated perovskite solar cells under light, bias voltage or heat fields . | NANOSCALE ADVANCES , 2021 , 3 (21) , 6128-6137 . |
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摘要 ：
Flexible perovskite solar cells (PSCs) have attracted tremendous attention due to their potential application in portable and wearable electronics. However, the photoelectric conversion efficiency (PCE) of flexible PSCs is still far lower than that of usual rigid PSCs. Moreover, the mechanical stability of flexible PSCs cannot meet the needs of commercial applications because of the cracking of perovskite grains caused by bending stress. Here, we introduced a spacer cation additive (2-(chloromethyl) pyridine hydrochloride, CPHC) within the perovskite organic precursor to improve the device PCE and its mechanical stability. We observed that the CPHC spacer cation additive could simultaneously facilitate the crystallization of perovskite and stitch the grain boundaries to improve the flexibility. Compared to the 17.64% PCE of the control devices, the target flexible PSCs achieved a more highly efficiency over 19% with an improved mechanical stability (87.2% of the initial PCE after the 1000 cycles with the bending radius R = 6 mm). In addition, compared to methylammonium or formamidinium cation, due to the stronger hydrophobic and larger activation energy barrier for the ion migration of the CPHC spacer cation, the device retained over 80% of the initial PCE after 30 days storage in an ambient environment.
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| GB/T 7714 | Zhang, Xiaobo , Ma, Yang , Chen, Xiaoqing et al. Improved efficiency and stability of flexible perovskite solar cells by a new spacer cation additive [J]. | RSC ADVANCES , 2021 , 11 (53) : 33637-33645 . |
| MLA | Zhang, Xiaobo et al. "Improved efficiency and stability of flexible perovskite solar cells by a new spacer cation additive" . | RSC ADVANCES 11 . 53 (2021) : 33637-33645 . |
| APA | Zhang, Xiaobo , Ma, Yang , Chen, Xiaoqing , Li, Xuhong , Zhou, Wencai , Ouedraogo, Nabonswende Aida Nadege et al. Improved efficiency and stability of flexible perovskite solar cells by a new spacer cation additive . | RSC ADVANCES , 2021 , 11 (53) , 33637-33645 . |
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摘要 ：
Traditional optical switches relying on the weak, volatile thermo-optic or electro-optic effects of Si or SiN waveguides show a high consumption and large footprint. In this paper, we reported an electric-driven phase change optical switch consisting of a Si waveguide, Ge2Sb2Te5 (GST) thin film and graphene heater suitable for large-scale integration and high-speed switching. The reversible transition between the amorphous and crystalline states was achieved by applying two different voltage pulses of 1.4 V (SET) and 4 V (RESET). The optical performance of the proposed switch showed a high extinction ration of 44-46 dB in a wide spectral range (1525-1575 nm), an effective index variation of Delta n (eff) = 0.49 and a mode loss variation of Delta alpha = 15 dB mu m(-1) at the wavelength of 1550 nm. In thermal simulations, thanks to the ultra-high thermal conductivity of graphene, the proposed switch showed that the consumption for the SET process was only 3.528 pJ with a 1.4 V pulse of 5 ns, while a 4 V pulse of 1.5 ns was needed for RESET process with a consumption of 1.05 nJ. Our work is helpful to analyze the thermal-conduction phase transition process of on-chip phase change optical switches, and the design of the low-energy-consumption switch is conducive to the integrated application of photonic chips.
关键词 ：
graphene graphene low-energy-consumption low-energy-consumption non-volatile non-volatile optical switch optical switch phase change material phase change material
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| GB/T 7714 | Li, Y. , Liu, F. R. , Han, G. et al. Design of an electric-driven nonvolatile low-energy-consumption phase change optical switch [J]. | NANOTECHNOLOGY , 2021 , 32 (40) . |
| MLA | Li, Y. et al. "Design of an electric-driven nonvolatile low-energy-consumption phase change optical switch" . | NANOTECHNOLOGY 32 . 40 (2021) . |
| APA | Li, Y. , Liu, F. R. , Han, G. , Chen, Q. Y. , Zhang, Y. Z. , Xie, X. X. et al. Design of an electric-driven nonvolatile low-energy-consumption phase change optical switch . | NANOTECHNOLOGY , 2021 , 32 (40) . |
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摘要 ：
The vertical van der Waals heterostructures based on 2-D materials have attracted tremendous attention in optoelectronic devices as they can offer perfect interface without dangling bonds, atomic layer thicknesses, and conveniently tunable energy band alignment. However, the carrier transport mechanism in vertically stacked van der Waals heterostructure photodetectors is usually neglected in regards of photoresponse enhancement strategy, leading to low photoresponsivity and quantum efficiency. Here, we report a vertically stacked tunneling photodetector based on WSe2/graphene/WS2 van der Waals heterostructure. By introducing graphene film into the WSe2/WS2 interface, the interface composition was ameliorated and the Fowler-Nordheim tunneling (FNT) was enhanced with the reduced tunneling barrier height and thickness, caused by the elevated energy level of electrons since strong electron-electron interaction, ultrafast thermalization (similar to 50 fs), and massless Dirac electrons of graphene. Therefore, the device exhibits a high photocurrent/dark current ratio (>10(4)), fast response time (similar to 300 mu s), high detectivity (similar to 1.58 x 10(12) Jones), and high responsivity (429 mA W-1) across a broad spectral range till 1 mu m at room temperature. The optimized detectivity and responsivity are about 150 times and 50 times higher than WSe2/WS2 device without graphene, respectively. These results contribute to offer a novel and versatile strategy for overcoming the performance limitation in van der Waals photodetector.
关键词 ：
Electrodes Electrodes Graphene Graphene heterojunction heterojunction Heterojunctions Heterojunctions Performance evaluation Performance evaluation photodetector photodetector Photodetectors Photodetectors Substrates Substrates tunneling tunneling Tunneling Tunneling
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| GB/T 7714 | You, Congya , Deng, Wenjie , Chen, Xiaoqing et al. Enhanced Photodetection Performance in Graphene-Assisted Tunneling Photodetector [J]. | IEEE TRANSACTIONS ON ELECTRON DEVICES , 2021 , 68 (4) : 1702-1709 . |
| MLA | You, Congya et al. "Enhanced Photodetection Performance in Graphene-Assisted Tunneling Photodetector" . | IEEE TRANSACTIONS ON ELECTRON DEVICES 68 . 4 (2021) : 1702-1709 . |
| APA | You, Congya , Deng, Wenjie , Chen, Xiaoqing , Zhou, Wencai , Zheng, Zilong , An, Boxing et al. Enhanced Photodetection Performance in Graphene-Assisted Tunneling Photodetector . | IEEE TRANSACTIONS ON ELECTRON DEVICES , 2021 , 68 (4) , 1702-1709 . |
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