Cd1-xZnxTe晶片中Zn组分的室温 显微光致发光平面扫描表征

用显微光致发光（μ-PL）平面扫描的方法对CdZnTe(CZT)晶片进行了研究．分别在19μm×16μm的缺陷区域进行微米尺度和7.9mm×6.0mm的大面积范围内进行毫米尺度的逐点PL测量．对测得每一点的PL谱进行了拟合,得到测量点的禁带宽度等参数,其平面分布对应于CZT中Zn的组分分布．统计的结果给出禁带宽度的不均匀性．对样品进行溴抛光后重复类似的测量,结果表明禁带宽度的均匀性大为改善,接近了材料组分的真实分布．     

Cd1-xZnxTe晶片中Zn组分的室温 显微光致发光平面扫描表征

用显微光致发光（μ-PL）平面扫描的方法对CdZnTe(CZT)晶片进行了研究．分别在19μm×16μm的缺陷区域进行微米尺度和7.9mm×6.0mm的大面积范围内进行毫米尺度的逐点PL测量．对测得每一点的PL谱进行了拟合,得到测量点的禁带宽度等参数,其平面分布对应于CZT中Zn的组分分布．统计的结果给出禁带宽度的不均匀性．对样品进行溴抛光后重复类似的测量,结果表明禁带宽度的均匀性大为改善,接近了材料组分的真实分布．     

CdZnTe晶片显微光致发光谱中的等效温度分布研究

提出并实现了用微米级空间分辨率的显微光致发光（μ-PL)平面扫描谱对CdZnTe(CZT)晶片的表面亚微米层特性研究。在含缺陷区域进行微米尺度和在大面积范围内进行毫米尺度的逐点PL测量。对测得每一点的PL谱进行了拟合。拟合参数中等效温度Tc的统计分布给出两个分布中心,表明存在有两种机制的发光过程。同时统计结果给出发光各点的不均匀性。等效温度的平面分布图直观地给出了各温度的平面位置,样品经溴 抛光后重复类似的测量,结果表明等效湿度的统计均匀性大为改善。抛光后的不同的缺陷点表现出不同的发光特性,意味着各自起源的不同。大面积PL扫描的统计结果和平面分布给出样品特性的整体评价。     

"神舟3号"上生长Cd1-xZnxTe晶片Zn组分分布的显微荧光研究

用显微荧光(μ-PL)方法对在我国"神舟3号"上空间生长的CdznTe晶片中zn组分分布的研究.对晶片的单晶"壳"区及未完全熔化的"芯"区中的小结晶区域进行了逐点PL测量.对测得每一点的PL谱进行了拟合,得到测量点的禁带宽度参数Eg,其分布对应于CdznTe中zn的组分分布.测量结果给出了空间生长晶片zn组分布的变化趋势和统计规律.作为比较,测量并分析了一块采用相同方法在地面生长的CdznTe晶片.     

Mg掺杂AlInP 650 nm LD外延片的Zn扩散研究

利用石英闭管法,对Mg掺杂AlInP 650 nm LD外延片进行Zn扩散,分析了扩散温度和时间2个参数对Zn扩散的影响.采用光致发光(PL)谱和电化学蒸涂(ECV)方法研究了Zn扩散产生的影响.PL谱结果表明,Zn扩散引起了AlGaInP/GaInP多量子阱(MQW)有源层的组分无序,使PL谱的峰值蓝移,最大蓝移为54 nm,约175 meV.ECV测量结果显示,Zn已经扩散到MQW有源区,MQW区域的p型载流子浓度为4.4×1017 cm-3.     

Cd1-xZnxTe太阳电池的一维数值模拟研究

具有禁带宽度在1.45～2.25eV连续可调特性的Cd1-xZnxTe(CZT)薄膜,用于顶电池在叠层薄膜太阳电池中有巨大的应用潜力。文章使用AMPS-1D对CdS/CZT结构的薄膜太阳电池进行模拟,研究了CZT与金属接触的背电极势垒、CZT薄膜厚度及掺杂浓度对CdS/CZT电池器件性能的影响。结果表明,需要采用功函数高(大于5.8eV)的金属作为背电极以消除背电极势垒;CZT薄膜厚度低于10μm时,增加厚度有助于增大电池短路电流;当CZT具有适当厚度(～6μm)时,对CZT层进行重掺杂(掺杂浓度1019～1021 cm-3)有助于获得更高效率的CdS/CZT电池。     

Cd1—xZnxTe晶片室温显微光致发光平面扫描谱

主要介绍用微米级空间分辨率的显微光致发光(μ-PL)平面扫描谱对CdZnTe(CZT)晶片表面亚微米层特性进行的研究。     

MOCVD生长的InGaN合金的性质

对使用 MOCVD方法在蓝宝石衬底上生长的典型 In Ga N样品进行了光致发光 (PL)、霍耳 (Hall)及扫描电镜 (SEM)测量 .结果表明 :适当的生长温度 (75 0℃ )提高了样品中 In的含量和 PL 强度。当 / 族比率大约 5 0 0 0时 ,75 0℃生长的样品背景载流子浓度约为 2 .2 1× 10 1 8cm- 3,In含量约为 11.5 4% .其室温 394nm的带边峰 ,半高宽约为 116 me V,束缚能约为 32 .4m e V,可能与束缚激子发光相关 .该样品禁带宽度随温度变化的温度系数 α (d E/ d T)约为 0 .5 6× 10 - 3e V/ K.较高温度 (80 0℃和 90 0℃ )生长的样品 In含量较低 ,PL 强度较弱 ,且在样     

熔体外延法生长截止波长8～12μm InAs1-xSbx单晶的透射光谱

用熔体外延法在InAs衬底上成功地生长了截止波长为8～12mm的InAs1-xSbx单晶.用红外光谱仪测量了样品的透射光谱.提出了组分微观分布函数的概念,并计算了InSb单晶和3种不同组分InAs1-xSbx样品的透射光谱.结果表明,实验测得的样品截止波长与计算得到的数据基本一致,从而证实了熔体外延法生长的InAs1-xSbx单晶的禁带宽度变窄现象,并认为组分微观分布的不均匀性可能影响Ⅲ-Ⅴ族混晶的能带结构.     

熔体外延法生长截止波长8～12μm InAs1-xSbx单晶的透射光谱

用熔体外延法在InAs衬底上成功地生长了截止波长为8～12mm的InAs1-xSbx单晶.用红外光谱仪测量了样品的透射光谱.提出了组分微观分布函数的概念,并计算了InSb单晶和3种不同组分InAs1-xSbx样品的透射光谱.结果表明,实验测得的样品截止波长与计算得到的数据基本一致,从而证实了熔体外延法生长的InAs1-xSbx单晶的禁带宽度变窄现象,并认为组分微观分布的不均匀性可能影响Ⅲ-Ⅴ族混晶的能带结构.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

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.     

Cost-effective test solutions for smart card and other integrated flash applications

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.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

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.     

An improved parallel thinning algorithm with two subiterations

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.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

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.     

Study of waveguide coupling efficiency in hybrid silicon lasers

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

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.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks