电流冲击对长波光导MCT探测器的影响

对长波光导MCT红外探测器进行了大电流长时间的冲击,对比了冲击前后探测器的电阻温度特性,并用该参数研究了器件的电学参数;测量了冲击前后探测器的黑体性能变化、响应光谱以及少子寿命.实验结果显示:短时间(42mA,70h)的电流冲击对探测器性能影响不大,探测器组分减小,截止波长变长;冲击时间长到(42mA,100h)一定程度后,探测器性能有不同程度的下降,组分变大,截止波长变短.这是因为电流产生的热效应加强了Hg扩散效应,从而使器件截止波长发生变化.     

电流冲击对长波光导MCT探测器的影响

对长波光导MCT红外探测器进行了大电流长时间的冲击,对比了冲击前后探测器的电阻温度特性,并用该参数研究了器件的电学参数;测量了冲击前后探测器的黑体性能变化、响应光谱以及少子寿命.实验结果显示:短时间(42mA,70h)的电流冲击对探测器性能影响不大,探测器组分减小,截止波长变长;冲击时间长到(42mA,100h)一定程度后,探测器性能有不同程度的下降,组分变大,截止波长变短.这是因为电流产生的热效应加强了Hg扩散效应,从而使器件截止波长发生变化.     

电流冲击对长波光导MCT探测器的影响

对长波光导MCT红外探测器进行了大电流长时间的冲击，对比了冲击前后探测器的电阻温度特性，并用该参数研究了器件的电学参数；测量了冲击前后探测器的黑体性能变化、响应光谱以及少子寿命. 实验结果显示：短时间（42mA, 70h）的电流冲击对探测器性能影响不大，探测器组分减小，截止波长变长；冲击时间长到（42mA, 100h）一定程度后，探测器性能有不同程度的下降，组分变大，截止波长变短. 这是因为电流产生的热效应加强了Hg扩散效应，从而使器件截止波长发生变化.     

非晶硅薄膜晶体管室温红外探测器的优化设计

介绍了基于非晶硅薄膜晶体管的室温红外探测器的基本特征及性能指标,对晶体管宽长比对探测器性能的影响进行了理论分析,分析表明,提高晶体管的宽长比可以改善探测器的探测率.为了克服传统微桥结构室温红外探测器成品率低的不足,提出了一种新的热绝缘材料,并将该材料应用到了非制冷红外探测器中,实际制备了探测器单元,对该材料的热绝缘能力进行了验证.     

红外探测器组件封装中的引线特性研究

引线互联是红外探测器封装的关键工艺之一,而采用何种引线则会直接影响红外探测器组件的电学、力学和热学性能。引线互联需要考虑引线的材料、线径、长度和引线工艺,因而红外探测器封装中通过采用多种引线来满足不同需求。系统介绍了红外探测器封装所用引线的电学、力学和热学性能,重点测试和分析了金丝、硅铝丝、铂金丝等引线在大气和真空环境下的熔断电流。大气环境下引线的熔断电流明显大于真空环境下,并与经验公式的结果基本一致。该研究可为航天用红外探测器封装的引线选择提供参考。     

大面阵红外探测器与低温冷平台集成后的应变测试研究

大面阵红外探测器是红外遥感仪器的核心元件。该类探测器大多由小规模面阵探测器拼接组成,与杜瓦低温冷平台集成后形成杜瓦组件。探测器在杜瓦低温冷平台上安装集成后的应力状态是影响芯片性能和寿命的关键因素。测试了低温时探测器在自由状态下和被安装在杜瓦组件内应变片的热输出,再利用两者的差值表征了探测器与杜瓦低温冷平台集成后的额外应变。以2000×512探测器组件为例,进行了测试验证分析,结果表明该方法可行。     

延伸波长InGaAs探测器封装用二级热电制冷器性能研究

真空封装技术是延伸波长InGaAs探测器的主要封装方法之一,热电制冷器可为延伸波长InGaAs探测器焦平面提供低温环境。测试了基于真空封装技术无热负载条件下二级热电制冷器的性能,研究了二级热电制冷器在不同输入电流(功率)时冷、热端温差与热负载的关系,测试了二级热电制冷器在低温工况下的制冷性能以及二级热电制冷器处于不工作状态时的表观热导率。结果表明,热沉温度为274 K时,冷端可以达到221.4 K并实现77.5 K的冷、热端温差;当输入电流一定时,随着热负载的增加,冷、热端温差呈线性趋势减小,且斜率随着输入电流增大而增大;二级热电制冷器冷、热端温差在较高温度时更大,即制冷性能更好;当温度分别为233.1 K 和249.8 K时,表观热导率分别为11.30 W/(m·K)和8.29 W/(m·K)。     

基于Pspice的热释电红外探测器设计探讨

介绍了热释电红外探测器的结构及工作原理,由热释电效应推导出了热释电电流及电压响应表达式,利用仿真软件Pspice分析了热释电探测器等效电路模型,并在红外专用芯片BISS0001不可重复触发工作方式下给出了探测器的实用电路。     

非晶硅薄膜晶体管室温红外探测器的优化设计

介绍了基于非晶硅薄膜晶体管的室温红外探测器的基本特征及性能指标,对晶体管宽长比对探测器性能的影响进行了理论分析,分析表明,提高晶体管的宽长比可以改善探测器的探测率。为了克服传统微桥结构室温红外探测器成品率低的不足,提出了一种新的热绝缘材料,并将该材料应用到了非制冷红外探测器中,实际制备了探测器单元,对该材料的热绝缘能力进行了验证。     

非晶硅薄膜晶体管室温红外探测器的优化设计

介绍了基于非晶硅薄膜晶体管的室温红外探测器的基本特征及性能指标，对晶体管宽长比对探测器性能的影响进行了理论分析，分析表明，提高晶体管的宽长比可以改善探测器的探测率。为了克服传统微桥结构室温红外探测器成品率低的不足，提出了一种新的热绝缘材料，并将该材料应用到了非制冷红外探测器中，实际制备了探测器单元，对该材料的热绝缘能力进行了验证。     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

GaAsSb/InAlAs PA DHBTs Grown by Production MBE

The epi material growth of GaAsSb based DHBTs with InAlAs emitters are investigated using a 4 × 100mm multi-wafer production Riber 49 MBE reactor fully equipped with real-time in-situ sensors including an absorption band edge spectroscope and an optical-based flux monitor. The state-of-the-art hole mobilities are obtained from 100nm thick carbon-doped GaAsSb. A Sb composition variation of less than ± 0.1 atomic percent across a 4 × 100mm platen configuration has been achieved. The large area InAlAs/GaAsSb/InP DHBT device demonstrates excellent DC characteristics,such as BVCEO＞6V and a DC current gain of 45 at 1kA/cm2 for an emitter size of 50μm × 50μm. The devices have a 40nm thick GaAsSb base with p-doping of 4. 5 × 1019cm-3 . Devices with an emitter size of 4μm × 30μm have a current gain variation less than 2% across the fully processed 100mm wafer. ft and fmax are over 50GHz,with a power efficiency of 50% ,which are comparable to standard power GaAs HBT results. These results demonstrate the potential application of GaAsSb/InP DHBT for power amplifiers and the feasibility of multi-wafer MBE for mass production of GaAsSb-based HBTs.     

Influence of polarization extinction ratio on distributed polarization coupling detection

Distributed polarization coupling in polarization-maintaining fibers can be detected by using a white light Michelson interferometer. This technique usually requires that only one polarization mode is excited. However, in practical measurement, the injection polarization direction could not be exactly aligned to one of the principal axes of the PMF, so the influence of the polarization extinction ratio should be considered. Based on the polarization coupling theory, the influence of the incident polarization extinction on the measurement result is evaluated and analyzed, and a method for distributed polarization coupling detection is developed when both two orthogonal eigenmodes are excited.     

Noise character analysis and the restraint of self-pulsation laser diodes

We calculate the Langevin noise sources of self-pulsation laser diodes, analyze the effects of active region noise and saturable-absorption region noise on the power fluctuation as well as period fluctuation, and propose a novel method to restrain the noise effects. A visible SIMULINK model is established to simulate the system, The results indicate that the effects of noise in absorption region can be ignored; that with the increase of DC injecting current, the noise effects enhance power jitter, and nevertheless, the period jitter is decreased; and that with external sinusoidal current modulating the self-pulsation laser diode, the noise-induced power jitter and period jitter can be suppressed greatly. This work is valuable for clock recovery in all-optical network.     

High-quality single-crystal CdSe nanoribbons and their optical properties

Large-scale synthesis of single-crystal CdSe nanoribbons is achieved by a modified thermal evaporation method, in which two-step-thermal-evaporation is used to control CdSe sources＇ evaporation. The synthesized CdSe nanoribbons are usually several micrometers in width, 50 nm in thickness, and tens to several hundred micrometers in length. Studies have shown that high-quality CdSe nanoribbons with regular shapes can be obtained by this method. Room-temperature photolumines-cence indicates that the lasing emission at 710 nm has been observed under optical pumping （266 nm） at power densities of 25-153 kW/cm^2. The full width half maximum （FWHM） of the lasing mode is 0.67 nm     

Propagation of hermite-cosh-gaussian beams passing through ABCD optical system with an annular aperture

By using the expansion of the aperture function into a finte sum of complex Gaussian functions, the corresponding analytical expressions of Hermite-cosh-Gaussian beams passing through annular apertured paraxially and symmetrically optical systems written in terms of ABCD matrix were derived, and they could reduce to the cases with squared aperture. In a similar way, the corresponding analytical expressions of cosh-Gaussian beams through annular apertured ABCD matrix were also given. The method could save more calculation time than that by using the diffraction integral formula directly.     

中国建立EB级存储实验室,致力云计算应用(英文)

正With the support of 863 programs,Sugon Information Industry Co.,Ltd.,set up a dawning EB-class storage laboratory to address massive data storage requirements and largescale cloud computing demonstration applications.The Dawning EB-class cloud storage system adopts advanced fault-tolerant architecture,efficient data fault-tolerant algorithms with user authentication and data encryption policies to deal with the"lost""wrong"and"stolen"problems of data for ensuring the reliability and safety of the EB-class storage system in the public network application environments.The Dawning EB-class Storage Laboratory taking advan-