256×1线列InGaAs短波红外焦平面的研究

利用分子束外延(MBE)方法生长的掺杂InGaAs吸收层PIN InP/InGaAs/InP双异质结外延材料,通过台面制作、硫化后覆盖聚酰亚胺钝化、电极生长等工艺,制作了台面构造的256×1正照射InGaAs探测器阵列。测试了器件的I-V特性与响应光谱,得出器件的暗电流Id、零偏压电阻R0、G因子;通过信号和噪声的测试,计算出了在278K时的平均峰值探测率为1.33×1012cmHz1/2W-1。256元InGaAs探测器阵列与CTIA结构L128读出电路相互连,经封装后成功制备256×1线列InGaAs短波红外焦平面,在室温(300K)时测得256元响应信号,其响应不均匀性为19.3%。     

128×1线列InGaAs短波红外焦平面的研究

报道了用分子束外延(MBE)方法生长的掺杂InGaAs吸收层PIN InP/InGaAs/InP双异质结外延材料,通过干法刻蚀和湿法腐蚀相结合制作台面、硫化和聚酰亚胺钝化、电极生长等工艺,制备了128×1台面正照射InGaAs探测器阵列.测试了器件的变温I-V、响应光谱和探测率,在278K时平均峰值探测率为1.03×1012cmHz1/2W-1.实现了128元InGaAs探测器阵列与CTIA结构L128读出电路相互连,经封装后,在室温(291K)时成功测出128元响应信号.焦平面响应的不均匀性为18.3%,并对不均匀性产生的原因进行了分析.     

正照射与背照射InGaAs探测器的性能对比研究

首先介绍了InGaAs台面探测器的研究进展,然后为了验证利用台面结制作背照射器件的可行性,利用分子束外延(MBE)方法生长的掺杂InGaAs吸收层PIN InP/InGaAs/InP双异质结外延材料,通过台面制作、钝化、电极生长、背面抛光等工艺,制备了8元台面InGaAs探测器,并测试了正照射和背照射时,器件的Ⅰ-Ⅴ、信号和响应光谱.测试结果表明,正照射和背照射情况下,器件的响应信号差别不大,正照射下器件的平均峰值探测率为4.1×1011 cm·Hz1/2·W-1,背照射下器件的平均峰值探测率为4.0×1011 cm·Hz1/2·W-1,但背照射情况下器件的响应光谱在短波方向有更好的截止.     

正、背照InGaAs探测器的性能对比研究

为了验证利用台面结制作背照射器件的可行性,利用分子束外延(MBE)方法生长的掺杂InGaAs吸收层PIN InP/InGaAs/InP双异质结外延材料,通过台面制作、钝化、电极生长、背面抛光等工艺,制备了8元台面InGaAs探测器,并测试了正照射和背照射时,器件的I-V、信号和响应光谱.测试结果表明,正照射和背照射情况下,器件的响应信号差别不大,正照射下器件的平均峰值探测率为4.13×1011cmHz1/2W-1,背照射下器件的平均峰值探测率为4×1011cmHz1/2W-1,但背照射情况下器件的响应光谱在短波方向有更好的截止.     

正照射与背照射InGaAs探测器的性能对比研究

首先介绍了InGaAs台面探测器的研究进展，然后为了验证利用台面结制作背照射器件的可行性，利用分子束外延(MBE)方法生长的掺杂InGaAs吸收层PIN InP／InGaAs／InP双异质结外延材料，通过台面制作、钝化、电极生长、背面抛光等工艺，制备了8元台面InGaAs探测器，并测试了正照射和背照射时，器件的I-V、信号和响应光谱。测试结果表明，正照射和背照射情况下，器件的响应信号差别不大，正照射下器件的平均峰值探测率为4．1×1011cm·Hz1/2·W-1，背照射下器件的平均峰值探测率为4．0×1011cm·Hz1/2·W-1，但背照射情况下器件的响应光谱在短波方向有更好的截止。     

两种钝化结构InGaAs红外探测器低频噪声的研究

低频噪声的测量和分析已成为红外探测器性能和可靠性评估的一种重要手段.制备了聚酰亚胺单层钝化和硫化后ZnS/聚酰亚胺双层钝化两种结构InGaAs探测器,测试了不同偏压或不同温度下器件的低频噪声谱,讨论了偏压和温度对InGaAs探测器低频噪声的影响.随着偏压的增加,噪声增大,拐点向低频方向移动,并且低频噪声随温度降低而减小.认为硫化后ZnS/聚酰亚胺双层钝化器件相对聚酰亚胺单层钝化器件相同偏压或温度下噪声较小,拐点低.因为硫化处理和ZnS层增强了钝化效果,器件的表面漏电流明显减小,因而大大降低了器件的低频噪声.     

LBIC技术研究InGaAs线列探测器串音及光敏感区

利用激光诱导电流技术研究了InGaAs台面探测器的相邻探测器间的串音和光敏感区。用分子束外延方法生长掺杂InGaAs的PIN InP/InGaAs/InP 外延材料,制备了256×1正照射台面InGaAs线列探测器。测试结果表明,InGaAs线列探测器相邻探测器间没有串音,虽然台面结构周围吸收层已被腐蚀,但因为少数载流子的侧向收集,扩大了有效光敏感区。     

正照射与背照射InGaAs探测器的性能对比研究

首先介绍了InGaAs台面探测器的研究进展，然后为了验证利用台面结制作背照射器件的可行性，利用分子束外延（MBE）方法生长的掺杂InGaAs吸收层PIN InP／InGaAs／InP双异质结外延材料，通过台面制作、钝化、电极生长、背面抛光等工艺，制备了8元台面InGaAs探测器，并测试了正照射和背照射时，器件的Ⅰ-Ⅴ、信号和响应光谱。测试结果表明，正照射和背照射情况下，器件的响应信号差别不大，正照射下器件的平均峰值探测率为4．1×10^11cm·Hz^1/2·W^-1，背照射下器件的平均峰值探测率为4．0×10^11cm·Hz^1/2·W^-1，但背照射情况下器件的响应光谱在短波方向有更好的截止。     

近红外256×1元InGaAs焦平面探测器无效像元研究

采用分子束外延方法生长的PIN型InP/InGaAs/InP双异质结材料制备了正照射256×1元近红外探测器,并与128×1奇偶两路读出电路互连,制备了近红外256×1元焦平面探测器.针对近红外InGaAs焦平面探测器中的无效像元问题,通过光学显微镜、扫描电镜和电学测试将无效像元进行分类,并分析了无效像元产生的原因.研...     

InGaAs台面探测器的AIN钝化研究

首次介绍了采用AlN介质薄膜为钝化层的InGaAs台面型探测器(λ=2.4 μm).探测器采用分子束外延(MBE)方法生长的原位掺杂的PIN In0.78Ga0.22As/In0.78Ga0.22As/InxGa1-xAs/InP 外延材料.由于台面型器件的裸露面积较大,特另q是台面的成形工艺所带来的侧面损伤,加大了光生载流子的表面复合,使器件的暗电流、噪声等性能急剧下降.采用新的AlN钝化工艺,制备了8元正照射台面InGaAs探测器,室温下(T=300 K)电压为-0.5 V时.探测器的暗电流(ID)约为9×10-8 A,优值因子(R0A)大于30 Ωcm2,通过与其他钝化工艺所制备的器件的性能进行分析对比得出:AlN能有效地改善器件的表面状态,减小表面复合,从而降低了暗电流,提高了探测器的性能.     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.