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Boosted Lithium-Ion Transport Kinetics in n-Type Siloxene Anodes Enabled by Selective Nucleophilic Substitution of Phosphorus
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作者 Se In Kim Woong-Ju Kim +1 位作者 Jin Gu Kang Dong-Wan Kim 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第10期618-637,共20页
Doped two-dimensional(2D)materials hold significant promise for advancing many technologies,such as microelectronics,optoelectronics,and energy storage.Herein,n-type 2D oxidized Si nanosheets,namely n-type siloxene(n-... Doped two-dimensional(2D)materials hold significant promise for advancing many technologies,such as microelectronics,optoelectronics,and energy storage.Herein,n-type 2D oxidized Si nanosheets,namely n-type siloxene(n-SX),are employed as Li-ion battery anodes.Via thermal evaporation of sodium hypophosphite at 275℃,P atoms are effectively incorporated into siloxene(SX)without compromising its 2D layered morphology and unique Kautsky-type crystal structure.Further,selective nucleophilic substitution occurs,with only Si atoms being replaced by P atoms in the O_(3)≡Si-H tetrahedra.The resulting n-SX possesses two delocalized electrons arising from the presence of two electron donor types:(i)P atoms residing in Si sites and(ii)H vacancies.The doping concentrations are varied by controlling the amount of precursors or their mean free paths.Even at 2000 mA g^(-1),the n-SX electrode with the optimized doping concentration(6.7×10^(19) atoms cm^(-3))delivers a capacity of 594 mAh g^(-1) with a 73%capacity retention after 500 cycles.These improvements originate from the enhanced kinetics of charge transport processes,including electronic conduction,charge transfer,and solid-state diffusion.The approach proposed herein offers an unprecedented route for engineering SX anodes to boost Li-ion storage. 展开更多
关键词 Li-ion battery Two-dimensional n-type siloxene Doping mechanism KINETICS
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Realizing High Thermoelectric Performance in n-Type Se-Free Bi_(2)Te_(3)Materials by Spontaneous Incorporation of FeTe_(2)Nanoinclusions
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作者 Jamil Ur Rahman Woo Hyun Nam +15 位作者 Yong-Jae Jung Jong Ho Won Jong-Min Oh Nguyen Van Du Gul Rahman Víctor M.García-Suárez Ran He Kornelius Nielsch Jung Young Cho Won-Seon Seo Jong Wook Roh Sang-il Kim Soonil Lee Kyu Hyoung Lee Hyun Sik Kim Weon Ho Shin 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第4期344-354,共11页
Bi_(2)Te_(3)-based materials have drawn much attention from the thermoelectric community due to their excellent thermoelectric performance near room temperature.However,the stability of existing n-type Bi_(2)(Te,Se)_(... Bi_(2)Te_(3)-based materials have drawn much attention from the thermoelectric community due to their excellent thermoelectric performance near room temperature.However,the stability of existing n-type Bi_(2)(Te,Se)_(3)materials is still low due to the evaporation energy of Se(37.70 kJ mol^(-1))being much lower than that of Te(52.55 kJ mol^(-1)).The evaporated Se from the material causes problems in interconnects of the module while degrading the efficiency.Here,we have developed a new approach for the high-performance and stable n-type Se-free Bi_(2)Te_(3)-based materials bymaximizing the electronic transport while suppressing the phonon transport,at the same time.Spontaneously generated FeTe_(2)nanoinclusions within the matrix during the melt-spinning and subsequent spark plasma sintering is the key to simultaneous engineering of the power factor and lattice thermal conductivity.The nanoinclusions change the fermi level of the matrix while intensifying the phonon scattering via nanoparticles.With a fine-tuning of the fermi level with Cu doping in the n-type Bi_(2)Te_(3)-0.02FeTe_(2),a high power factor of∼41×10^(-4)Wm^(-1)K^(-2)with an average zT of 1.01 at the temperature range 300-470 K are achieved,which are comparable to those obtained in n-type Bi_(2)(Te,Se)_(3)materials.The proposed approach enables the fabrication of high-performance n-type Bi_(2)Te_(3)-based materials without having to include volatile Se element,which guarantees the stability of the material.Consequently,widespread application of thermoelectric devices utilizing the n-type Bi_(2)Te_(3)-based materials will become possible. 展开更多
关键词 Bi_(2)Te_(3) energy harvesting FeTe_(2) nanoinclusion n-type materials THERMOELECTRIC
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强潮海湾Spoiler海底管道冲刷机理分析 被引量:4
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作者 刘光生 杨元平 +1 位作者 吴修广 李君 《海洋学研究》 CSCD 北大核心 2016年第2期53-59,共7页
本文基于历年检测资料统计分析了杭州湾海底输油管道裸露埋深状态变化规律,结合水文地形测量资料、辅以数学模型手段,从Spoiler自埋设计、杭州湾水流特性、管道路由海床演变特性以及人类活动等多因素探索了杭州湾海底管道裸露埋深状态... 本文基于历年检测资料统计分析了杭州湾海底输油管道裸露埋深状态变化规律,结合水文地形测量资料、辅以数学模型手段,从Spoiler自埋设计、杭州湾水流特性、管道路由海床演变特性以及人类活动等多因素探索了杭州湾海底管道裸露埋深状态变化的原因。研究结果表明:杭州湾管道80%以上处于埋深状态,局部管段长期裸露,裸露管段主要位于北岸深槽和庵东边滩滩坡区域;管道冲刷与管道路由海床演变特性、水流与管道夹角以及Spoiler自埋设计的发挥密不可分;杭州湾南岸围垦工程的实施与该区域管道裸露、掩埋状态密切相关。 展开更多
关键词 杭州湾 海底管线 spoiler 海床演变 人类活动
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Spoiler自埋技术特点及其在杭州湾海底管道运行情况分析 被引量:8
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作者 杨元平 吴修广 +2 位作者 刘光生 谢东风 张芝永 《海洋学研究》 CSCD 北大核心 2016年第3期57-61,共5页
海底管道阻流板(Spoiler)自沉埋技术是一种新型管道自埋技术,为深入了解其作用机制及其效果,本文通过分析安装有阻流板的杭州湾海底管道历年检测资料,结合管道附近海域海床、潮流动力特性,深入探讨了阻流板装置在实际工程中的运行效果,... 海底管道阻流板(Spoiler)自沉埋技术是一种新型管道自埋技术,为深入了解其作用机制及其效果,本文通过分析安装有阻流板的杭州湾海底管道历年检测资料,结合管道附近海域海床、潮流动力特性,深入探讨了阻流板装置在实际工程中的运行效果,分析了其作用机制及其适用条件。研究发现安装阻流板装置的杭州湾海底管道在往复潮流作用下逐渐埋入海床,其埋入段长度由2005年的50%增加到2013年的80%以上,而且平均埋入深度超过2.6m,自埋效果较好;而在管道路由与海流平行段或管道敷设于抗冲刷强海床上时,阻流板作用不能有效发挥,管道仍然呈现裸露状态。 展开更多
关键词 海底管道 阻流板 自埋 杭州湾
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Experimental Study of Hydrodynamic and Self-Buried Behavior of Submarine Pipeline with Perpendicular Spoilers 被引量:2
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作者 FAN Hong-xia WANG Jian-zhong +2 位作者 ZHU Li-jun WANG Nai-ru CHEN Huai 《China Ocean Engineering》 SCIE EI CSCD 2021年第2期250-261,共12页
The spoiler is a kind of device to disturb current and promote burying.At present,all submarine pipeline spoilers at home and abroad are parallel spoilers,that is,the plane of the spoiler is parallel to the vertical p... The spoiler is a kind of device to disturb current and promote burying.At present,all submarine pipeline spoilers at home and abroad are parallel spoilers,that is,the plane of the spoiler is parallel to the vertical plane of the pipeline axis.According to the results of indoor experiments,when the pipeline with the forward spoiler is installed perpendicular to the direction of water flow,the spoiler will accelerate the seabed erosion and cause the pipeline to endure downward pressure,which will eventually cause the pipeline self-buried to form a protection.However,when the pipeline direction is consistent with the flow direction,the self-buried behavior and protective effect is vanished.By aiming at the defect that the forward spoiler cannot be self-buried when the direction of the pipeline and the flow are basically parallel,the spoiler burying aid device perpendicular to the pipeline axis has been innovatively developed,and the hydrodynamic changes and sediment erosion characteristics near the pipeline after the installation of the device were studied based on the experiment.Results reveal that although the perpendicular spoiler cannot generate downforce,it can greatly increase the turbulent kinetic energy of the flow and the rate of sediment erosion.The larger the angle between the pipeline axis and the spoiler plane is,the larger the increase in turbulent energy will be.The increase in turbulent energy near the bed surface can reach up about 70%when the angle is 90°,while serious sediment erosion mainly occurs along both sides of the pipeline with a distance of about 2−4 times the pipe diameter.In the future,we can further explore the influence of the perpendicular spoiler size and installation position on the pipeline downforce and the effect of burying promotion.At the same time,field tests on the perpendicular spoiler burying aid device currently developed will conduct to observe the actual effect of perpendicular spoiler promoting pipeline scouring and burying,and improve submarine pipeline safety protection technology. 展开更多
关键词 submarine pipeline spoiler self-burial turbulent kinetic energy sediment erosion
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Noticeable positive Doppler effect on optical bistability in an N-type active Raman gain atomic system 被引量:2
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作者 常增光 钮月萍 +1 位作者 张敬涛 龚尚庆 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第11期280-284,共5页
We theoretically investigate the Doppler effect on optical bistability in an N-type active Raman gain atomic system inside an optical ring cavity. It is shown that the Doppler effect can greatly enhance the dispersion... We theoretically investigate the Doppler effect on optical bistability in an N-type active Raman gain atomic system inside an optical ring cavity. It is shown that the Doppler effect can greatly enhance the dispersion and thus create the bistable behaviour or greatly increase the bistable region, which has been known as the positive Doppler effect on optical bistability. In addition, we find that a positive Doppler effect can change optical bistability from the hybrid dispersion-gain type to a dispersive type. 展开更多
关键词 positive Doppler effect optical bistability n-type atomic system active Raman gain
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Analytical Descriptions of Magnetic Properties and Magnetoresistance in n-Type HgCr_2Se_4 被引量:2
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作者 林朝镜 石友国 李永庆 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第7期157-160,共4页
We present a detailed investigation of magnetic properties of colossal magnetoresistance material HgCr2Se4. While spontaneous magnetization and zero-field magnetic susceptibility are found to follow asymptotic scaling... We present a detailed investigation of magnetic properties of colossal magnetoresistance material HgCr2Se4. While spontaneous magnetization and zero-field magnetic susceptibility are found to follow asymptotic scaling laws for a narrow range of temperatures near the critical point, two methods with connections to the renormalization group theory provide analytical descriptions of the magnetic properties for much wider temperature ranges. Based on this, an analytical formula is obtained for the temperature dependence of the low field magnetoresistance in the paramagnetic phase. 展开更多
关键词 of on de is ET Analytical Descriptions of Magnetic Properties and Magnetoresistance in n-type HgCr2Se4 in for
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New CMOS compatible super-junction LDMOST with n-type buried layer 被引量:1
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作者 段宝兴 张波 李肇基 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第12期3754-3759,共6页
A new super-junction lateral double diffused MOSFET (LDMOST) structure is designed with n-type charge compensation layer embedded in the p^--substrate near the drain to suppress substrate-assisted depletion effect t... A new super-junction lateral double diffused MOSFET (LDMOST) structure is designed with n-type charge compensation layer embedded in the p^--substrate near the drain to suppress substrate-assisted depletion effect that results from the compensating charges imbalance between the pillars in the n-type buried layer. A high electric field peak is introduced in the surface by the pn junction between the p^--substrate and n-type buried layer, which given rise to a more uniform surface electric field distribution by modulation effect. The effect of reduced bulk field (REBULF) is introduced to improve the vertical breakdown voltage by reducing the high bulk electric field around the drain, The new structure features high breakdown voltage, low on-resistance and charges balance in the drift region due to n-type buried layer. 展开更多
关键词 super-junction LDMOST n-type buried layer REBULF breakdown voltage
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Uniaxial stress influence on lattice,band gap and optical properties of n-type ZnO:first-principles calculations 被引量:1
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作者 Yang Ping Li Pei +4 位作者 Zhang Li-Qiang Wang Xiao-Liang Wang Huan Song Xi-Fu Xie Fang-Wei 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第1期399-403,共5页
The lattice, the band gap and the optical properties of n-type ZnO under uniaxial stress are investigated by first- principles calculations. The results show that the lattice constants change linearly with stress. Ban... The lattice, the band gap and the optical properties of n-type ZnO under uniaxial stress are investigated by first- principles calculations. The results show that the lattice constants change linearly with stress. Band gaps are broadened linearly as the uniaxial compressive stress increases. The change of band gap for n-type ZnO comes mainly from the contribution of stress in the c-axis direction, and the reason for band gap of n-type ZnO changing with stress is also explained. The calculated results of optical properties reveal that the imaginary part of the dielectric function decreases with the increase of uniaxial compressive stress at low energy. However, when the energy is higher than 4.0 eV, the imaginary part of the dielectric function increases with the increase of stress and a blueshift appears. There are two peaks in the absorption spectrum in an energy range of 4.0-13.0 eV. The stress coefficient of the band gap of n-type ZnO is larger than that of pure ZnO, which supplies the theoretical reference value for the modulation of the band gap of doped ZnO. 展开更多
关键词 uniaxial stress FIRST-PRINCIPLES optical properties n-type ZnO
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Hot-Carrier Effects on Total Dose Irradiated 65 nm n-Type Metal-Oxide-Semiconductor Field-Effect Transistors 被引量:1
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作者 郑齐文 崔江维 +3 位作者 周航 余德昭 余学峰 郭旗 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第7期117-119,共3页
The influence of total dose irradiation on hot-carrier reliability of 65 nm n-type metal-oxide-semiconductor field- effect transistors (nMOSFETs) is investigated. Experimental results show that hot-carrier degradati... The influence of total dose irradiation on hot-carrier reliability of 65 nm n-type metal-oxide-semiconductor field- effect transistors (nMOSFETs) is investigated. Experimental results show that hot-carrier degradations on ir- radiated narrow channel nMOSFETs are greater than those without irradiation. The reason is attributed to radiation-induced charge trapping in shallow trench isolation (STI). The electric field in the pinch-off region of the nMOSFET is enhanced by radiation-induced charge trapping in STI, resulting in a more severe hot-carrier effect. 展开更多
关键词 of NM in Hot-Carrier Effects on Total Dose Irradiated 65 nm n-type Metal-Oxide-Semiconductor Field-Effect Transistors STI on IS
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Recent development of n-type thermoelectric materials based on conjugated polymers 被引量:1
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作者 Bin Meng Jun Liu Lixiang Wang 《Nano Materials Science》 CAS CSCD 2021年第2期113-123,共11页
Thermoelectric(TE)materials based on conjugated polymers have received much attention due to their great advantages of solution processibility,light weight,flexibility,and low thermal conductivity.These advantages mak... Thermoelectric(TE)materials based on conjugated polymers have received much attention due to their great advantages of solution processibility,light weight,flexibility,and low thermal conductivity.These advantages make them potential candidates for large-area,low-cost and low-power TE applications.Both efficient p-type and n-type conjugated polymers with high and comparable thermoelectric performance are required for practical TE applications.However,due to the inefficient n-doping efficiency and unstable electron transport of most n-type conjugated polymers,the TE performance of n-type polymers is much poorer than that of their p-type counterparts,impeding the development of polymer TE materials.Great efforts have been made to address the low ndoping efficiency and TE performance of n-type polymers,including the chemical modification of traditional ntype polymers,the design of new n-type conjugated polymers,and the development of more efficient n-dopants,as well as doping engineering.Nowadays,the TE performance of n-type polymers has been greatly improved,indicating a bright future for polymer TE materials.In this review,we summarize the recent progress made on ntype polymer TE materials,mainly focusing on the structure-performance relationships based on promising n-type polymers for TE applications.This review aims to provide some guidelines for future material design. 展开更多
关键词 Polymer thermoelectrics n-type polymers N-DOPING CONDUCTIVITY Power facto
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Numerical study of the influence of spoiler deflection on high-lift configuration
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作者 Wenhu Wang Peiqing Liu 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2017年第3期159-163,共5页
This paper numerically studies the influence of the downward spoiler deflection on the boundary layer flow of a high-lift two-element airfoil consisting of a droop nose, a main wing, a downward deflecting spoiler and ... This paper numerically studies the influence of the downward spoiler deflection on the boundary layer flow of a high-lift two-element airfoil consisting of a droop nose, a main wing, a downward deflecting spoiler and a single slotted flap. Both of the boundary layer of the upper surface of the spoiler and the confluent boundary layer of the upper surface of the flap become thicker, as the downward spoiler deflection increases. Compared to the attached flow at the angle of attack of 10°, the flow of the upper surface of the spoiler becomes separated at the angle of attack of 16° when the spoiler deflection is large enough, which corresponds to the boundary layer flow reversal in velocity profiles. 展开更多
关键词 HIGH-LIFT spoiler Boundary layer Numerical simulation
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STUDY ON FORCED SHEAR FLOW BY A OSCILLATING SPOILER
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作者 Yin Xieyuan Ouyang Liangbiao (Univ.of Sci.& Tech.of China) 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 1989年第3期205-215,共11页
In the present paper,numerical solution of the two-dimensional unsteady Navier-Stokes equations is used to study the forced shear flow induced by a spoiler's periodical up and down oscillation on a flat plate.The ... In the present paper,numerical solution of the two-dimensional unsteady Navier-Stokes equations is used to study the forced shear flow induced by a spoiler's periodical up and down oscillation on a flat plate.The paper studies the evolution of growing,shedding,merging and decaying of vortices due to the spoiler's oscillation,particularly the dependence of the forced shear flow on the re- duced frequency.Results show that the reduced frequency is a key factor in controlling the growing and the shedding of vortices in the shear layer.The instantaneous streamlines and the equi-vorticity con- tours,as well as the surface pressure distributions,have also been investigated.Numerical results agree well with corresponding experimental ones.The study is helpful for understanding the physical mecha- nism of shear flow control. 展开更多
关键词 shear flow unsteady separated flow spoiler
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Experimental Investigation of Spoiler Deployment on Wing Stall
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作者 Scott Douglas Lindsay Paul Walsh 《Open Journal of Fluid Dynamics》 2018年第3期308-320,共13页
Upper surface wing flaps, known as spoiler, are typically used to reduce lift and increase drag at touchdown;however spoilers have been shown to increase lift and reduce drag at near-stall conditions. The purpose of t... Upper surface wing flaps, known as spoiler, are typically used to reduce lift and increase drag at touchdown;however spoilers have been shown to increase lift and reduce drag at near-stall conditions. The purpose of this experiment was to determine the spoilers’ impact on lift, drag, moment, and aerodynamic efficiency of a NACA 2412 airfoil at angles of attack (α) from &#8722;8 ° to 32 °. The experiment was conducted in the Ryerson Low-Speed Wind Tunnel (closed-circuit, 1 m × 1 m test section) at Re=783761, Ma=0.136. The lift coefficient (Cl), drag coefficient (Cd), moment coefficient about the quarter-chord () were captured with a changing spoiler deflection angle (δ) and spoiler length (b in percent chord). It was found that deflecting the spoiler resulted in an increase maximum lift of up to 2.497%. It was found that deflecting the spoiler by 8° was optimal for the b=10 cases. Any larger deflection reduced the lift gain, and a deflection of 25° caused the maximum lift to be 2.786% less than the clean configuration. In the b=15 case, δ=15° was optimal (1.760% maximum lift coefficient increase). The b=10 cases increased maximum lift coefficient between 0.35% and 2.10% higher than the b=15 cases. The source of the lift gain at high angles of attack is apparent in an analysis of the airfoil pressure distribution. The spoiler increased the suction peak on the airfoil surface upstream of the spoiler, and increased the pressure downstream. However the suction increase upstream is larger than the pressure increase downstream, resulting in a net increase in lift. The spoiler increased the stall angle 37.658% to 87.658% higher than the clean configuration. Stall angle increased with both δ and with an increased spoiler length. The spoiler airfoil produced less drag than the clean configuration at high angles of attack. The combination of the increased lift, and reduced drag resulted in an increase in aerodynamic efficiency at high angle of attack. 展开更多
关键词 Aircraft STALL WIND-TUNNEL spoilers Low-Speed AERODYNAMICS
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N-type core-shell heterostructured Bi2S3@Bi nanorods/polyaniline hybrids for stretchable thermoelectric generator
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作者 Lu Yang Chenghao Liu +3 位作者 Yalong Wang Pengcheng Zhu Yao Wang Yuan Deng 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第2期73-79,共7页
With the growing need on distributed power supply for portable electronics,energy harvesting from environment becomes a promising solution.Organic thermoelectric(TE)materials have advantages in intrinsic flexibility a... With the growing need on distributed power supply for portable electronics,energy harvesting from environment becomes a promising solution.Organic thermoelectric(TE)materials have advantages in intrinsic flexibility and low thermal conductivity,thus hold great prospect in applications as a flexible power generator from dissipated heat.Nevertheless,the weak electrical transport behaviors of organic TE materials have severely impeded their development.Moreover,compared with p-type organic TE materials,stable and high-performance n-type counterparts are more difficult to obtain.Here,we developed a n-type polyaniline-based hybrid with core-shell heterostructured Bi;S;@Bi nanorods as fillers,showing a Seebeck coefficient-159.4μV/K at room temperature.Further,a couple of n/p legs from the PANI-based hybrids were integrated into an elastomer substrate forming a stretchable thermoelectric generator(TEG),whose function to output stable voltages responding to temperature differences has been demonstrated.The in situ output performance of the TEG under stretching could withstand up to 75%elongation,and stability test showed little degradation over a one-month period in the air.This study provides a promising strategy to develop stable and high thermopower organic TEGs harvesting heat from environment as long-term power supply. 展开更多
关键词 polyaniline-based hybrids thermoelectric properties n-type stretchable electronics
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Experimental Investigation of the Electromagnetically Induced-Absorption-Like Effect for an N-Type Energy Level in a Rubidium BEC
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作者 Khan Sadiq Nawaz Cheng-Dong Mi +2 位作者 Liang-Chao Chen Peng-Jun Wang Jing Zhang 《Chinese Physics Letters》 SCIE CAS CSCD 2019年第4期15-18,共4页
We study the electromagnetically induced-absorption-like(EIA-like) effect for an n-type system in an ^(87)Rb Bose–Einstein condensate(BEC) using the absorption imaging technique for coupling and driving lasers operat... We study the electromagnetically induced-absorption-like(EIA-like) effect for an n-type system in an ^(87)Rb Bose–Einstein condensate(BEC) using the absorption imaging technique for coupling and driving lasers operating at the D_1 and D_2 lines of ^(87)Rb. The coherent effect is probed by measuring the number of atoms remaining after the BEC is exposed to strong driving fields and a weak probe field. The absorption imaging technique accurately reveals the EIA-like effect of the n-type system. This coherent effect in an n-type system is useful for optical storage, tunable optical switching, and so on. 展开更多
关键词 87Rb Bose–Einstein CONDENSATE lasers n-type system
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n-type ZnS used as electron transport material in organic light-emitting diodes
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作者 杜鹏 张希清 +2 位作者 孙学柏 姚志刚 王永生 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第6期1370-1373,共4页
This paper reports on the n-type ZnS used as electron transport layer for the organic light-emitting diodes (OLEDs). The naphthyl-substituted benzidine derivative (NPB) and tris (8-hydroxyquinoline) aluminium (... This paper reports on the n-type ZnS used as electron transport layer for the organic light-emitting diodes (OLEDs). The naphthyl-substituted benzidine derivative (NPB) and tris (8-hydroxyquinoline) aluminium (Alq3) are used as the hole transport layer and the emitting layer respectively. The insertion of the n-type ZnS layer enhances the electron injection in the OLEDs. The study was carried out on OLEDs of structures: indium-tin-oxide (ITO)/NPB/Alq3/ZnS/LiF/AL, ITO/NPB/Alq3/LiF/AL and ITO/NPB/Alq3/AL. The luminance and efficiency of the device containing this electron transport layer are increased significantly over those obtained from conventional devices due to better carrier balance. 展开更多
关键词 OLEDS n-type ZnS electron transport layer LUMINANCE efficiency
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Nonlinear optical properties in n-type quadrupleδ-doped GaAs quantum wells
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作者 Humberto Noverola-Gamas Luis Manuel Gaggero-Sager Outmane Oubram 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第4期348-351,共4页
The effects of the interlayer distance on the nonlinear optical properties of n-type quadrupleδ-doped GaAs quantum well were theoretically investigated.Particularly,the absorption coefficient and the relative refract... The effects of the interlayer distance on the nonlinear optical properties of n-type quadrupleδ-doped GaAs quantum well were theoretically investigated.Particularly,the absorption coefficient and the relative refraction index change were determined.In the effective mass approach and within the framework of the Thomas-Fermi theory,the Schrodinger equation was resolved.Thereby,the subband energy levels and their respective wave functions were calculated.The variations in the nonlinear optical properties were determined by using the density matrix solutions.The achieved results demonstrate that the interlayer distance causes optical red-shift on nonlinear optical properties.Therefore,it can be deduced that the suitably chosen interlayer distance can be used to tune optical properties within the infrared spectrum region in optoelectronic devices such as far-infrared photo-detectors,high-speed electronic-optical modulators,and infrared lasers. 展开更多
关键词 DELTA-DOPING n-type GaAs layers electronic structure non-linear optical properties
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Boron implanted emitter for n-type silicon solar cell
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作者 梁鹏 韩培德 +1 位作者 范玉洁 邢宇鹏 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第3期447-452,共6页
The effects of ion doses on the properties of boron implanted Si for n-type solar cell application were investigated with doses ranging from 5×10^14cm^-2 to 2×10^15cm^-2 and a subsequent two-step annealing p... The effects of ion doses on the properties of boron implanted Si for n-type solar cell application were investigated with doses ranging from 5×10^14cm^-2 to 2×10^15cm^-2 and a subsequent two-step annealing process in a tube furnace.With the help of the TCAD process simulation tool, knowledge on diffusion kinetics of dopants and damage evolution was obtained by fitting SIMS measured boron profiles. Due to insufficient elimination of the residual damage, the implanted emitter was found to have a higher saturation current density(J0e) and a poorer crystallographic quality. Consistent with this observation, V oc, J sc, and the efficiency of the all-implanted p^+–n–n^+solar cells followed a decreasing trend with an increase of the implantation dose. The obtained maximum efficiency was 19.59% at a low dose of 5×10^14cm^-2. The main efficiency loss under high doses came not only from increased recombination of carriers in the space charge region revealed by double-diode parameters of dark I–V curves, but also from the degraded minority carrier diffusion length in the emitter and base evidenced by IQE data. These experimental results indicated that clusters and dislocation loops had appeared at high implantation doses, which acted as effective recombination centers for photogenerated carriers. 展开更多
关键词 boron implanted emitter n-type silicon clusters and dislocation loops saturation current density
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Thermoelectric Properties of n-type Poly(nickel 1,1,2,2-ethenetetrathiolate)Prepared by a New One-step Solvothermal Method
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作者 WANG Yijiang YAO Qin +1 位作者 QU Sanyin CHEN Lidong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第4期760-764,共5页
Poly(nickel 1,1,2,2-ethenetetrathiolate)(poly[Na_(x)(Ni-ett)])is one of the most promising n-type organic thermoelectric materials which can be used in wearable devices.However,the conventional solution method is time... Poly(nickel 1,1,2,2-ethenetetrathiolate)(poly[Na_(x)(Ni-ett)])is one of the most promising n-type organic thermoelectric materials which can be used in wearable devices.However,the conventional solution method is time-consuming and the prepared poly[Na_(x)(Ni-ett)]usually has poor crystallinity,which does not benefit for achieving high thermoelectric performance.Here,a new one-step solvothermal method under the high reaction temperature and high vapor pressure was developed to prepare poly[Na_(x)(Ni-ett)]with a quite short period.The experimental results show crystallinity and electrical conductivity are greatly enhanced as compared with those prepared by conventional solution method.As a result,a maximum ZT value of 0.04 was achieved at 440 K,which is about four times of the polymer prepared by the conventional solution method.This study may provide a new route to enhance the TE properties of n-type organic thermoelectric materials. 展开更多
关键词 THERMOELECTRIC organic materials n-type poly[Na_(x)(Ni-ett)] solvothermal method
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