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双面肖特基势垒型GaAs粒子探测器由半绝缘砷化镓材料制成,器件结构为金属-半导体-金属结构,该探测器能经受能量为1.5MeV、剂量高达1000kGy的电子、500kGy的γ射线、β粒子、X射线等粒子的辐照测试,辐照后器件击穿曲线坚挺,反向漏电流最低为0.48μA.器件的另一特征是其反向漏电流与X射线的照射量呈线性关系.该探测器在241Am(Ea=5.48MeV)a粒子辐照下,其最大的电荷收集率和能量分辩率分别为45%和7%.在由90Sr(Eβ=2.27MeV)发出的β粒子辐照下,探测器有最小的电离粒子谱.该探测器对光照也有明显的响应. 相似文献
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GaAs粒子探测器的能谱特性 总被引:1,自引:1,他引:0
阐述了具有 M- S- M结构的 Ga As粒子探测器在α、β粒子、光子、X射线辐照下 ,在室温时测得的能谱特性。对2 41 Am 5.48Me V的α粒子 ,其电荷收集率 (CCE)和能量分辨率 (FWHM)的最好结果分别为 45%和 7%。对 5 7Co 1 2 2 ke V的 X射线能量分辨率约为 30 %。该探测器对 90 Sr2 .2 7Me V的β粒子有最小的电离粒子谱。探测器在累积照射量为 1 3 k Gy的光子 1 3 7Cs(662 ke V)辐照下 ,辐照前后的电荷收集率无明显变化。诸多实验结果表明 ,该探测器具有较强的抗辐射能力 相似文献
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双面肖特基势垒型GaAs粒子探测器的电特性研究 总被引:2,自引:1,他引:1
研究了有源面积为9mm2的双面肖特基势垒GaAs粒子探测器的电特性。器件工艺简单,结构新颖,反向耐压高于300V,反向漏电流密度低(91nA/mm2),该器件能经受能量为1.5MeV、剂量为1000kGy的电子照射,电特性正常,是一种抗辐照的粒子探测器。 相似文献
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介绍了最新研制成功的 Ga As微条粒子探测器的芯片设计和工艺设计。每一微条长度均为 1 70 0 0μm,宽度分别为 2 0、5 0、1 0 0、2 0 0和 3 0 0 μm。微条间距有 5 0、1 0 0、2 0 0和 3 0 0 μm四种 ,芯片面积为 5 .95 mm×1 7.0 0 mm。微条粒子探测器的反向击穿电压最高达 2 40 V,反向漏电流密度最低为 0 .0 2 5 μA/mm2。它对光照有强烈的敏感性。微条粒子探测器的辐照特性见其它论文报道 相似文献
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带电粒子辐射对GaAs/AlGaAs多量子阱光学性质的影响 总被引:2,自引:0,他引:2
利用光荧光谱研究了带电粒子辐照对 Ga As/Al Ga As多量子阱光学性质的影响。用能量为 1 Me V、注量为 1 0 1 3~ 1 0 1 6 /cm2 的电子辐照 ,模拟太空环境下范艾仑带对多量子阱的辐射。辐射后在 45 0℃真空环境下退火 5分钟 ,测量了辐照前后材料的荧光谱。发现量子阱特征峰 772 nm(E=1 .61 e V)辐照后峰位不变 ,峰高有所降低 ,但退火后峰高有所恢复 ,仍比辐照前要低 ;注量为 1 0 1 6 /cm2 的样品中 Ga As的 D0 ~ A0 对复合发光峰 83 2nm(E=1 .49e V)消失。对此结果进行了讨论 ,并与质子辐照的情况作了比较。 相似文献
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提出了一种新型的 Si COIMESFET器件结构 ,即介质槽隔离 Si COIMESFET。模拟结果表明 ,新型结构器件与常规平面 Si COI MESFET器件相比 ,击穿电压得到很大提高 ,从 3 80 V提高到近 1 1 0 0 V,而饱和漏电流和跨导下降。但通过器件结构的优化设计可以保障在击穿电压提高的同时漏电流和跨导不会发生大的退化。该器件结构为高温、抗辐照和大功率集成电路研制打下基础。 相似文献
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Michael Reilly 《半导体技术》2004,29(12)
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system. 相似文献
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Thomas M.Trexler 《半导体技术》2004,29(5)
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test. 相似文献
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The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high. 相似文献
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The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation. 相似文献
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Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible. 相似文献
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Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's. 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory. 相似文献