共查询到20条相似文献,搜索用时 328 毫秒
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针对典型卫星轨道辐射环境下激光二极管(LD)的可靠性评估问题,对自研的975 nm GaAs基量子阱(QW)LD开展了10 MeV质子、3×108~3×1011 cm-2注量的地面模拟辐照实验。结合蒙特卡罗软件仿真模拟和数学分析方法,全面研究了器件位移损伤退化规律,以及不同注量、不同辐照缺陷对器件功率特性、电压特性和波长特性等关键参数的影响。结果显示,质子辐照会引入非辐射复合中心等缺陷并破坏界面结构,导致载流子浓度降低、光电限制能力下降,宏观上体现为器件阈值电流增加、输出功率下降、波长红移和单色性受损。同时,3×1010 cm-2以上注量的10 MeV质子等效位移损伤剂量辐照会对975 nm QW LD性能产生较大影响。 相似文献
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采用传输线模型测量了重B掺杂p型金刚石薄膜(约1020cm-3)上Ti/A u欧姆接触电阻率ρc,测试了500℃退火前后及大电流情况下的I-V特性,研究 了退火对ρc的影响.结果表明,重掺杂和退火工艺是改善欧姆接触的有效手段. ρc随测试温度的变化表明金属/半导体接触界面载流子输运机制为隧道穿透.而 光照对ρc影响的分析表明金刚石可作为理想窗口材料.测试得到的最低ρ c值约为10-4Ωcm2.
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金刚石薄膜
欧姆接触
接触电阻率 相似文献
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采用一种简易的化学置换反应方法在泡沫镍基底上生长花针状的金纳米结构,并将其作为表面增强拉曼散射(SERS)基底,主要研究置换时间对SERS基底性能的影响。采用COMSOL Multiphysics仿真软件对金纳米粒子高度分别为100,150,175,200 nm的基底进行电磁增强仿真,得到最大电场强度分别为20.112,29.060,24.766,21.382 V/m,计算得到增强因子分别为1.64×105、7.13×105、3.76×105和2.09×105。使用罗丹明6G(R6G)溶液作为探针分子,对不同置换时间下的泡沫镍镀金基底进行拉曼表征、检测极限测试以及拉曼mapping测试。测试结果表明,置换时间为10 min的基底增强效果是最佳的,对R6G分子的检测浓度可以达到10-8 mol·L-1,在613,774,1364 cm-1这三个R6G分子的拉曼位移特征峰处的相对标准偏差值分别为11.3%、10.9%和11.9%,说明基底... 相似文献
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分别采用二种不同方法测量分子束外延(MBE)生长GaAs/In0.2Ga0.8As单量子阱结构的导带不连续量ΔEc:1) 考虑样品界面电荷修正的电容-电压(C-V)分布;2) 量子阱载流子热发射产生的电容瞬态(DLTS).C-V测得的ΔEc=0.227eV,大约相当于89% ΔEg.DLTS测得的ΔEc=0.229eV,大约相当于89.9% ΔEg.结果
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用深能级瞬态谱(DLTS)技术系统研究了Si/SiO2界面附近的深能级和界面态。结果表明,在热氧化形成的Si/SiO2界面及其附近经常存在一个浓度很高的深能级,它具有若干有趣的特殊性质,例如它的DLTS峰高度强烈地依赖于温度,以及当栅偏压使费密能级与界面处硅价带顶的距离明显小于深能级与价带顶的距离时,仍然可以观测到一个很强的DLTS峰。另外,用最新方法测量的Si/SiO2界面连续态的空穴俘获截面与温度有关,而与能量位置无明显关系,DLTS测
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高组份Al值的AlxGa1-x As和AlxGa1-x As/GaAs/AlxGa1-xAs/GaAs多层结构的MOCVD生长 总被引:1,自引:1,他引:0
用自制常压MOCVD系统,在半绝缘GaAs衬底上生长高Al组份AlxGa1-xAs(其x值达0.83),和AlxGa1-xAs/GaAs/AlxGa1-xAs/GaAs多层结构,表面镜面光亮。生长层厚度从几十到十几μm可控,测试表明外延层晶格结构完整,x值调节范围宽,非有意掺杂低,高纯GaAs外延层载流子浓度n300K=1.7×1015cm-3,n77K=1.4×1015cm-3,迁移率μ300K=5900cmcm2/V.S,μ77K=55500cm2/V.S。用电子探针,俄歇能谱仪测不出非有意掺杂的杂质,各层间界面清晰平直。 对GaAs,AlGaAs生长层表面缺陷,衬底偏角生长温度及其它生长条件也进行了初步探讨。 相似文献
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Large Storage Window in a-SiNx/nc-Si/a-SiNx Sandwiched Structure for Nanocrystalline Silicon Floating Gate Memory Application 下载免费PDF全文
An a-SiNx/nanocrystalline silicon [(nc-Si)/a-SiNx] sandwiched structure is fabricated in a plasma enhanced chemical vapour deposition (PECVD) system at low temperature (250℃). The nc-Si layer is fabricated from a hydrogen-diluted silane mixture gas by using a layer-by-layer deposition technique. Atom force microscopy measurement shows that the density of nc-Si is about 2 ×10^11 cm^-2. By the pretreatment of plasma nitridation, low density of interface states and high-quality interface between the Si substrate and a-SiNs insulator layer are obtained. The density of interface state at the midgap is calculated to be 1 ×10^10 cm^-2eV^-1 from the quasistatic and high frequency C - V data. The charging and discharging property of nc-Si quantum dots is studied by capacitance-voltage (C- V) measurement at room temperature. An ultra-large hysteresis is observed in the C - V characteristics, which is attributed to storage of the electrons and holes into the nc-Si dots. The long-term charge-loss process is studied and ascribed to low density of interface states at SiNx/Si substrate. 相似文献
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The properties of GaAs/AlGaAs solar cells irradiated with 40, 70, 100 and 170 keV protons have been studied. Current-voltage (IV) measurement showed that the worst degradation was found in the cells irradiated by 100 keV protons. The degradation was found defect dependent. Defect profile was obtained by the stopping and range of ions in matter (SRIM) simulation and deep-level transient spectroscopy (DLTS) measurement. In order to obtain the deep-level defect profile in depletion layer by DLTS measurement, the traditional calculation formula of defect concentration has been modified. DLTS measurement showed good agreement with that of the SRIM simulation. 相似文献
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本文研究了由液相外延技术生长的GaAIAs/GaAs双异质结材料制成的发光管,有源层掺杂剂对器件特性的影响结果表明,器件结构和器件制作工艺相同的GaAIAs/GaAs发光管,有源层掺Si可获得较大的光输出功率,而频响特性<15MHz,波长在8700Å以上;对有源层掺Ge器件,光输出功率低于掺Si器件,而频响特性则>15MHz,波长可控制在8200Å~8500Å.深能级测量表明二者有不同的深能级位置,对掺Si(氧沾污)器件,Ec-ET≈0.29eV,而掺Ge器件ET-Ev≈0.42eV.两种掺杂剂对有源层暗缺陷的影响尚无明显区别. 相似文献
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用深能级瞬态谱(DLTS)技术测量了高温退火的Be和Si共注入的LEC半绝缘GaAs(无掺杂)。在多子脉冲作用下的Al/Be-Si共注LECSIGaAs肖特基势垒中,观测到E01(0.298),E02(0.341),E03(0.555)和E04(0.821)等四个电子陷阱以及两个主要的少子(空穴)陷阱H'03(0.54)和H″03(0.57)。两少子陷阱的DLTS信号具有若干特点,比如它们的DLTS·峰难于通过增宽脉冲达到最大高度;以及峰的高度强烈地依赖于温度等。这些现象可以用少子陷阱的少子俘获和热发射理论进行合理地解释。鉴于用DLTS技术测量这种陷阱的困难,我们用恒温电容瞬态技术测定它们的空穴表观激活能分别为0.54和0.57eV。它们是新观测到的和Be-Si共注SIGaAs有关缺陷。
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W.P. Li Y.M. Liu R. Zhang J. Chen P. Cheng X.L. Yuan Y.G. Zhou B. Shen R.L. Jiang Y. Shi Z.G. Liu Y.D. Zheng 《Applied Physics A: Materials Science & Processing》2001,72(1):85-87
Si-based metal–ferroelectric–semiconductor (MFS) structures without buffer layers between Si and ferroelectric films have
been developed by depositing SrBi2Ta2O9 (SBT) directly on n-type (100)-oriented Si. Some effective processes are adopted to improve the electrical properties of
these MFS structures. Contrary to the conventional MFS structures with top electrodes directly on ferroelectrics, our MFS
structures have been developed with thin dense SiO2 films deposited between ferroelectric films and top electrodes. Due to the SiO2 films, the leakage current densities of MFS structures are reduced to 2×10-8 A/cm2 under the bias of 5 V. The C-V electrical properties of the MFS structures are greatly improved after annealing at 400 °C
in N2 ambient for 1 h. The C-V memory windows are increased to 3 V, which probably results from the decrease of the interface trap
density at the Si/SBT interface.
Received: 7 September 1999 / Accepted: 24 November 1999 / Published online: 2 August 2000 相似文献