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Black phosphorus nanoflakes as morphology modifier for efficient fullerene-free organic solar cells with high fill-factor and better morphological stability

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Nano Research 2019年第4期12卷 777-783页

作者： Weitao Yang Long Ye Fenfa Yao Chuanhong Jin Harald Ade Hongzheng Chen state key laboratory of silicon materials MOE Key Laboratory of Macromolecular Synthesis and Functionalization& Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China department of physics Organic and Carbon Electronics Laboratory (ORaCEL) North Carolina State University Raleigh NC 27695 USA state key laboratory of silicon materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

Morphology of the donor:acceptor blend plays a critical role in the photovoltaic performance of the organic solar cells (OSCs).Herein,liquid-phase-exfoliated black phosphorus nanoflakes (BPNFs),for their outstanding electronic property and good compatibility to solution process,were applied to fullerene-free OSCs as morphology *** by X-ray scattering measurements,the PTB7-Th:IEICO-4F blends incorporated with BPNFs exhibit more ordered π-π stacking and promoted domain purity,contributing to lower charge transport resistance and suppressed charge recombination within the bulk heterojunction (BHJ).As a result,a high fill factor (FF) of 0.73 and a best power conversion efficiency (PCE) of 12.2% were obtained for fullerene-free OSCs based on PTB7-Th:IEICO-4F blends incorporating with BPNFs,which is among the highest FF of the as-cast fullerene-free OSCs with PCE over 12%.More importantly,the embedded BPNFs help to improve the morphological stability of the devices probably by retarding the phase mixing in the BHJ during the aging ***,analogous enhancements were observed in another fullerene-free OSCs based on PBDB-T:*** a word,this work provides a new strategy of using two-dimentional nanoflakes as facile and universal morphology modifier for efficient fullerene-free OSCs.

关键词： fullerene-free organic solar cells black phosphorus nanoflakes morphology tuning device stability

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Structural characteristics of surface-functionalized nitrogen-doped diamond-like carbon films and effective adjustment to cell attachment

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Chinese physics B 2015年第5期24卷 473-478页

作者：刘爱萍刘敏郁建灿钱国栋唐为华 state key laboratory of silicon materials Department of Materials Science & Engineering Zhejiang University Center for Optoelectronics materials and Devices Department of Physics Zhejiang Sci-Tech University state key laboratory of Information Photonics and Optical Communication Beijing University Posts and Telecommunications

Nitrogen-doped diamond-like carbon （DLC：N） films prepared by the filtered cathodic vacuum arc technology are functionalized with various chemical molecules including dopamine （DA）, 3-Aminobenzeneboronic acid （APBA）, and adenosine triphosphate （ATP）, and the impacts of surface functionalities on the surface morphologies, compositions, microstructures, and cell compatibility of the DLC：N films are systematically investigated. We demonstrate that the surface groups of DLC：N have a significant effect on the surface and structural properties of the film. The activity of PC12 cells depends on the particular type of surface functional groups of DLC：N films regardless of surface roughness and wettability. Our research offers a novel way for designing functionalized carbon films as tailorable substrates for biosensors and biomedical engineering applications.

关键词： surface functionalization nitrogen-doped diamond-like carbon film microstructure

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Two-dimensional optoelectronic devices for silicon photonic integration

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Journal of Materiomics 2023年第3期9卷 551-567页

作者： Zilan Tang Shula Chen Dong Li Xiaoxia Wang Anlian Pan key laboratory for Micro-Nano physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and ChemometricsHunan Institute of Optoelectronic IntegrationCollege of Materials Science and EngineeringHunan UniversityChangshaHunan410082China

With the unprecedented increasing demand for extremely fast processing speed and huge data capacity,traditional silicon-based information technology is becoming saturated due to the encountered bottle-necks of Moore's *** material systems and new device architectures are considered promising strategies for this ***-dimensional(2D)materials are layered materials and garnered persistent attention in recent years owing to their advantages in ultrathin body,strong light-matter interaction,flexible integration,and ultrabroad operation wavelength *** this end,the integra-tion of 2D materials into silicon-based platforms opens a new path for silicon photonic *** this work,a comprehensive review is given of the recent signs of progress related to 2D material inte-grated optoelectronic devices and their potential applications in silicon ***,the basic op-tical properties of 2D materials and heterostructures are summarized in the first ***,the state-of-the-art three typical 2D optoelectronic devices for silicon photonic applications are reviewed in ***,the perspective and challenges for the aim of 3D monolithic heterogeneous integration of these 2D optoelectronic devices are discussed.

关键词： Two-dimensional materials silicon photonics Heterogeneous integration Optoelectronic devices

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Solid Additive-Assisted Layer-by-Layer Processing for 19%Efficiency Binary Organic Solar Cells

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Nano-Micro Letters 2023年第7期15卷 16-29页

作者： Guanyu Ding Tianyi Chen Mengting Wang Xinxin Xia Chengliang He Xiangjun Zheng Yaokai Li Di Zhou Xinhui Lu Lijian Zuo Zhikang Xu Hongzheng Chen state key laboratory of silicon materials Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China department of physics The Chinese University of Hong KongNew TerritoriesHong Kong 999077People’s Republic of China Zhejiang University-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 310014People’s Republic of China MOE key laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China key laboratory of Adsorption and Separation materials and Technologies of Zhejiang Province Zhejiang UniversityHangzhou 310027People’s Republic of China

Morphology is of great significance to the performance of organic solar cells(OSCs),since appropriate morphology could not only promote the exciton dissociation,but also reduce the charge *** this work,we have developed a solid additive-assisted layer-by-layer(SAA-LBL)processing to fabricate high-efficiency *** adding the solid additive of fatty acid(FA)into polymer donor PM6 solution,controllable pre-phase separation forms between PM6 and *** intermixed morphology facilitates the diffusion of acceptor Y6 into the donor PM6 during the LBL processing,due to the good miscibility and fast-solvation of the FA with chloroform solution ***,this results in the desired morphology with refined phase-separated domain and vertical phase-separation structure to better balance the charge transport/collection and exciton ***,the binary single junction OSCs based on PM6:Y6 blend reach champion power conversion efficiency(PCE)of 18.16%with SAA-LBL processing,which can be generally applicable to diverse systems,e.g.,the PM6:L8-BO-based devices and thick-film *** efficacy of SAA-LBL is confirmed in binary OSCs based on PM6:L8-BO,where record PCEs of 19.02%and 16.44%are realized for devices with 100 and 250 nm active layers,*** work provides a simple but effective way to control the morphology for high-efficiency OSCs and demonstrates the SAA-LBL processing a promising methodology for boosting the industrial manufacturing of OSCs.

关键词： Organic solar cells Fatty acid Solid additive Layer-by-layer Vertical phase separation

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Energy transfer and frequency upconversion in Er^(3+)-Yb^(3+) codoped oxy-fluoro-tungstosilicate glasses

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Journal of Rare Earths 2012年第5期30卷 422-425页

作者：揭光涛赵高凌汪建勋韩高荣 state key lab of silicon Material and department of materials Science and Engineering Zhejiang University

Er3＋-Yb3＋ codoped oxy-fluoro-tungstosilicate glasses with infrared-to-visible frequency upconversion luminescence were prepared by melting quenching in *** effects of Er3＋ doping on the optical properties of the samples were measured by means of techniques such as optical absorption spectra and photoluminescence *** results showed that intense green and red signals centered at 546 and 665 nm,corresponding to the 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions of Er3＋ by a multiphoton stepwise phonon-assisted excited-state absorption process,respectively,were simultaneously observed by exciting the samples with a diode laser operating at 980 nm at room *** upconversion process was found very sensitive to Er3＋ content at a constant Yb2O3 content of 5 mol.%.With the increase of Er3＋ content from 0.5% to 1.5%,the upconversion intensity increased *** increasing of Er3＋ content to 3.0% resulted in a significant fluorescence ***,the possible upconversion mechanisms were discussed based on the energy-matching conditions and the quadratic dependence on excitation power.

关键词： oxy-fluoro-tungstosilicate rare earth ions upconversion luminescence glass

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Possible p-Wave Superconductivity in Epitaxial Bi/Ni Bilayers

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Chinese physics Letters 2015年第6期32卷 146-149页

作者：龚欣欣周和心徐鹏超岳迪朱凯金晓峰田鹤赵格剑陈庭勇 state key laboratory of Surface physics and Department of PhysicsFudan University Collaborative Innovation Center of Advanced Microstructures Fudan University state key laboratory of silicon materials and School of materials Science and Engineering Zhejiang University department of physics Arizona State University

Superconductivity （SC） is one of the most intriguing physical phenomena in nature. Nucleation of SC has long been considered highly unfavorable if not impossible near ferromagnetism, in low dimensionality and, above all, out of non-superconductor. Here we report observation of SC with TC near 4K in Ni/Bi bilayers that defies all known paradigms of superconductivity, where neither ferromagnetic Ni film nor rhombohedra Bi film is superconducting in isolation. This highly unusual SC is independent of the growth order （Ni/Bi or Bi/Ni）, but highly sensitive to the constituent layer thicknesses. Most importantly, the SC, distinctively non-s pairing, is triggered from, but does not occur at, the Bi/Ni interface. Using point contact Andreev reflection, we show evidences that the unique SC, naturally compatible with magnetism, is triplet p-wave pairing.

关键词： Bi Possible p-Wave Superconductivity in Epitaxial Bi/Ni Bilayers Ni SC

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Highly spectra-stable pure blue perovskite light-emitting diodes based on copper and potassium co-doped quantum dots

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Nano Research 2023年第5期16卷 7654-7660页

作者： Fang Chen Wenjie Ming Yongfei Li Yun Gao Lea Pasquale Kexin Yao Boyuan Huang Qiuting Cai Guochao Lu Jizhong Song Mirko Prato Xingliang Dai Haiping He Zhizhen Ye School of materials Science and Engineering State Key Laboratory of Silicon MaterialsZhejiang UniversityHangzhou 310027China Wenzhou key laboratory of Novel Optoelectronic and Nano materials Institute of WenzhouZhejiang UniversityWenzhou 325006China Wenzhou XINXINTAIJING Tech.Co.Ltd. Wenzhou 325006China Shanxi‐Zheda Institute of Advanced materials and Chemical Engineering Taiyuan 030000China department of materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Multi-scale Porous materials Center Institute of Advanced Interdisciplinary Studies&School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China materials Characterization Facility Istituto Italiano di TecnologiaGenova 16163Italy School of physics and Microelectronics Zhengzhou UniversityZhengzhou 450052China

Halide perovskite light emitting diodes(LEDs)have gained great progress in recent ***,mixed-halide perovskites for blue LEDs usually suffer from electroluminescence(EL)spectra shift at a high applied voltage or current density,limiting their *** this work,we report a strategy of using single-layer perovskite quantum dots(QDs)film to tackle the electroluminescence spectra shift in pure-blue perovskite LEDs and improve the LED efficiency by co-doping copper and potassium in the mixed-halide perovskite *** a result,we obtained pure-blue halide perovskite QD-LEDs with stable EL spectra centred at 469 nm even at a current density of 1,617 mA·cm^(−2).The optimal device presents a maximum external quantum efficiency(EQE)of 2.0%.The average maximum EQE and luminance of the LEDs are 1.49%and 393 cd·m^(−2),increasing 62%and 66%compared with the control *** study provides an effective strategy for achieving spectra-stable and highly efficient pure-blue perovskite LEDs.

关键词： light-emitting diode blue LED perovskite quantum dot stable electroluminescence spectra metal doping

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Partially reversible photochromic behavior of organic-inorganic perovskites with copper(II) chloride

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Journal of Zhejiang University-Science A(Applied physics & Engineering) 2009年第5期10卷 710-715页

作者： Xiao-wei PAN Gang WU Mang WANG Hong-zheng CHEN state key lab of silicon materials MOE Key Laboratory of Macromolecule Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

We report that the ultraviolet (UV) light induced photochromic behavior of layered organic-inorganic perovskite material of (C4H9NH3)2CuCl4, changed from yellow to brown after irradiation with UV light (10 mW/cm2) and partially recovered through storage in the dark. (C4H9NH3)2CuCl4 exhibited two distinct absorption bands centered at 286 nm (band I) and 384 nm (band II), which were attributed to the photo-induced exciton formed in 2D inorganic layers sandwiched by organic layers. The blue shift of band I from 287 to 269 nm as well as the decrease of the intensity of band I and band II could be found when samples were irradiated under UV light for different length of time. The simultaneous weakening of the intensity of the N-H···Cl hydrogen bond as well as the vibration of the long Cu-Cl bond in the distorted CuCl64-octahedron could be detected from the Fourier transform infrared (FTIR) spectra, which resulted the change of charge distribution of the dissymmetric Cl-Cu···Cl bond and the resulting photochromic behavior.

关键词：光致变色行为有机无机钙钛矿酰氯傅里叶变换红外光谱性能紫外线照射铜

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Microwave heating as a universal method to transform confined molecules into armchair graphene nanoribbons

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Nano Research 2023年第7期16卷 10644-10651页

作者： Haoyuan Zhang Yingzhi Chen Kunpeng Tang Ziheng Lin Xuan Li Hongwei Zhang Yifan Zhang Chi Ho Wong Chi Wah Leung Chee Leung Mak Yuan Hu Weili Cui Kecheng Cao Lei Shi state key laboratory of Optoelectronic materials and Technologies Nanotechnology Research CenterGuangdong Province Key Lab of Display Material and TechnologySchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China Huzhou key laboratory of Environmental Functional materials and Pollution Control School of EngineeringHuzhou UniversityHuzhou 313000China department of Industrial and Systems Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 999077China department of Applied physics The Hong Kong Polytechnic UniversityHong Kong 999077China Shanghai key laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China

Armchair graphene nanoribbons(AGNRs)with sub-nanometer width are potential materials for the fabrication of novel nanodevices thanks to their moderate direct band *** are usually synthesized by polymerizing precursor molecules on substrate ***,it is time-consuming and not suitable for large-scale *** can also be grown by transforming precursor molecules inside single-walled carbon nanotubes(SWCNTs)via furnace annealing,but the obtained AGNRs are normally *** this work,microwave heating is applied for transforming precursor molecules into *** fast heating process allows synthesizing the AGNRs in *** different molecules were successfully transformed into AGNRs,suggesting that it is a universal *** importantly,as demonstrated by Raman spectroscopy,aberrationcorrected high-resolution transmission electron microscopy and theoretical calculations,less twisted AGNRs are synthesized by the microwave heating than the furnace *** results reveal a route for rapid production of AGNRs in large scale,which would benefit future applications in novel AGNRs-based semiconductor devices.

关键词： armchair graphene nanoribbons(AGNRs) microwave heating single-walled carbon nanotubes(SWCNTs) Raman spectroscopy

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Tuning the electron transport behavior at Li/LATP interface for enhanced cyclability of solid-state Li batteries

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Nano Research 2023年第1期16卷 1634-1641页

作者： Linshan Luo Feng Zheng Haowen Gao Chaofei Lan Zhefei Sun Wei Huang Xiang Han Ziqi Zhang Pengfei Su Peng Wang Shengshi Guo Guangyang Lin Jianfang Xu Jianyuan Wang Jun Li Cheng Li Qiaobao Zhang Shunqing Wu Ming-Sheng Wang Songyan Chen department of physics Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesKey Laboratory of Low Dimensional Condensed Matter Physics(Department of Education of Fujian Province)Jiujiang Research InstituteXiamen UniversityXiamen 361005China state key lab of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005China College of materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Western Digital Corporation 951 Sandisk DrMilpitasCA 95035USA

An interlayer is usually employed to tackle the interfacial instability issue between solid electrolytes(SEs)and Li metal caused by the side ***,the failure mechanism of the ionic conductor interlayers,especially the influence from electron penetration,remains largely ***,using Li1.3Al0.3Ti1.7(PO4)3(LATP)as the model SE and LiF as the interlayer,we use metal semiconductor contact barrier theory to reveal the failure origin of Li/LiF@LATP interface based on the calculation results of density functional theory(DFT),in which electrons can easily tunnel through the LiF grain boundary with F vacancies due to its narrow barrier width against electron injection,followed by the reduction of ***,an Al-LiF bilayer between Li/LATP is found to dramatically promote the interfacial stability,due to the highly increased barrier width and homogenized electric field at the ***,the Li symmetric cells with Al-LiF bilayer can exhibit excellent cyclability of more than 2,000 h superior to that interlayered by LiF monolayer(~860 h).Moreover,the Li/Al-LiF@LATP/LiFePO4 solid-state batteries deliver a capacity retention of 83.2%after 350 cycles at 0.5 *** findings emphasize the importance of tuning the electron transport behavior by optimizing the potential barrier for the interface design in high-performance solid-state batteries.

关键词： solid-state electrolyte Li metal LiF Al electron transport interfacial barrier

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