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1.
为了研究钝化层对声表面波(SAW)滤波器性能的影响,以二氧化硅(SiO2)薄膜为钝化层,对厚度为12~80 nm 的SiO2膜钝化层工艺数据进行分析。结果表明,当SiO2膜钝化层覆膜厚度大于25 nm时其膜层质量均匀性好,致密度高。同时SiO2膜钝化层厚度对膜层间的粘性、传播损耗、自身的质量负载及谐振峰处的频率均有影响,且会引起过渡带宽发生变化。  相似文献   

2.
锑基薄膜太阳电池具有原材料丰富、制备方法简单 和光电性能优异等优势。将宽带隙 Sb2S3电池与窄带隙Sb2Se3电池组成叠层太阳电池能够进一步提高光谱能量利用率 ,增强器 件性能。基于此,采用wx-AMPS软件对锑基双结叠层薄膜太阳电池进行了仿真优化。仿 真结果显示,要想获得高效的叠层太阳电池首先需要高质量的吸收层,吸收层缺陷态要低于 1015 cm-3才能够将光生载流子充分转换为电流。除此 之外,子电池厚度的调制能够平衡顶 底电池的光谱响应,在叠层太阳电池的优化中也十分重要。基于此,绘制了不同顶底电 池厚度叠层太阳电池性能参数的等高线图,为叠层太阳电池的实验优化制备提供指导,并最 终在顶底电池厚度分别为700 nm和2500 nm的情况下,得到24.60%的锑基双结叠层太阳电 池 的最高光电转换效率。研究结果体现了新型锑基薄膜叠层太阳电池结构的优势和发展 潜力。  相似文献   

3.
热处理温度对Li2SrSiO4:Eu2+发光性能的影响   总被引:5,自引:5,他引:0  
采用高温固相反应法制备一种白光发光二极管(LED )用黄色荧光粉Li2Sr(1-x)SiO4:xEu2+, 研究测试温度和退火温度对Li2Sr(1-x)SiO4:xEu2+荧光粉发光性能的影响。实验发现,对于 不同掺杂浓度的样品,在不同测试温度下,经过热处理后的样品与未处理样品相 比,激发和发射光谱强度得到普遍提高,原因是热处理后晶体结构的完整性得到 提高。在变温测试下,Li2Sr(1-x)SiO4:xEu2+的发光性能总体是随着测试温度升高而 下降,但在短波长(500~550nm)范围内的发光性能随着温度升高 而增强。分析表明,这与Li2SrSiO4基质材料的晶体结构和掺杂元素有关。  相似文献   

4.
采用电子束蒸发镀膜方法在K9玻璃基底上分别镀制了ITO/SiO2/ITO,ITO/Ti2O3/ITO和ITO/MgF2/ITO结构的多层薄膜,用四探针方块电阻仪测量薄膜表面的方块电阻,用原子力显微镜观测样品的表面微观形貌。结果显示,当ITO薄膜的粗糙度较大且介质薄膜的物理厚度小于100nm时,各层ITO薄膜之间通过山峰状的凸起结构相连通,导致样片表面的方块电阻测量值与各层ITO薄膜电阻的并联值相当。这表明,当ITO薄膜的粗糙度较大且介质薄膜厚度较小时,各层ITO薄膜表现出电阻并联效应。利用多层ITO薄膜的电阻并联效应设计并制备了450~1200nm超宽光谱透明导电薄膜,用四探针方块电阻仪测量了试验样片的表面方块电阻,用紫外-可见-近红外分光光度计测试了样片的光谱透射率。结果显示,在相同表面方块电阻条件下,相比于单层ITO薄膜,利用ITO薄膜电阻并联效应所制备的多层透明导电薄膜具有更高的光谱透射率。  相似文献   

5.
在氧化气氛下,采用固相反应法合成了一系列 KLa1-x(MoO4)2:Eu3+x红 色荧光粉。利 用X射线衍射仪、扫描电子显微镜和荧光分光光度计考察了KLa1-x(MoO4)2:Eu3+x荧光粉的 物相、形貌和发光强度。结果表明,激活剂Eu3+和助熔剂H3BO3的添加没有改变K La(MoO4)2的物相结构。KLa1-x(MoO4)2:Eu 3+x荧光粉可以被近紫外(393 nm )和蓝光(463 nm)有效 激发,主发射峰值位于616 nm附近,发射红光,归属为Eu3+5D07F2跃迁。393nm和463nm的激发波长与目前广泛使用的近紫外和蓝光LED芯片相匹配。添加质量分数为5%的H3BO3时 ,所制备的KLa1-x(MoO4)2:Eu3+x红色荧光粉的发光强度比未掺杂H3BO3时的发光强度提高了234%,色坐标 (0.639,0.339)比商用的Y2O3:Eu3+(0.625,0.338)更接近于美国电 视标准委员会标准(0.67),这表明这 种荧光粉具备成为商业化红色荧光粉的潜力。  相似文献   

6.
采用高温固相反应法制备了Zn3Ga3.99Ge xO9+2x:1%Cr3+(x=1,2,3,4,5)新型近红外长余辉荧光粉, 利用X射线衍射(XRD)和荧光(PL)光谱分别对其晶体结构、PL性质和余辉性能进行了分析。结 果表明,Zn3Ga3.99Cr0.01GexO9+2x实际上是Cr3+和Ge4+共同取代了ZnGa2O4尖晶石 结构中的部分Ga3+而形成的固溶体; 样品可以被近紫外光和蓝绿光有效地激发,发射出640nm波长范围的红光和近红外光,峰值位于695nm波长 附近,属于Cr3+的特征发射,对应于2E→4A2的跃迁;余辉持续时间均超过300h。进一步分析了烧结温度对Zn3Ga 3.99GexO9+2x:1%Cr3+(x =1,2,3,4,5)材料的发光和余辉性能影响,得到Zn3Ga3.99Cr0.01Ge1O11 的最佳烧结温度是1200℃,且随温度的升高, 样品的发光和余辉性能均得到提高。  相似文献   

7.
研究了WO3对Rubrene/C70有机太阳能电池 (OSCs)性能的 改善,制备了结构为ITO/WO3/Rubrene/C70/BCP/Al的OSCs,其中WO3插入在I TO和Rubrene中间作为阳极修饰层。通过优化WO3的厚度,研究了WO3对OSCs性能的改善及其作用机理。实验发现,器件的短路电流Jsc、开路电压Voc、 填充因子(FF)、光电转换效率(PCE)和串联电阻Rs等性能参数随WO3厚度的变化呈规律性变化;当 WO3厚度小于80 nm时,器件PCE随着厚度的增加不断增大;当W O 3厚大于80 nm时,器件PCE随着厚度的 增加不断减小;当WO3厚度为80 nm 时,器件PCE达到最高为1.03%, 相应的J sc、Voc、FF分别为2.81mA·cm-2、 0.83V、43.85%,Rs为45.3Ω·cm2,对比没有WO3修饰层, 器件的Jsc、Voc、FF和PCE分别提高了31%、137%、17%,Rs降低了33%。  相似文献   

8.
ZnO缓冲层改善Rubrene/C70有机太阳能电池的性能   总被引:2,自引:2,他引:0  
通过制备结构为ITO/ZnO/C70 /Rubrene/MoO3/Al 的有机太阳能电池(OSCs),研究了ZnO作为阴极 修饰层对Rubrene/C70有机太阳能电池性能的改善。同时通过 优化ZnO的厚度研究了ZnO的工作机理。 从实验结果可以看出,随着ZnO厚度的变化,器件的短路电流密度(Jsc)、开路电压(Voc)、填充因子 (FF)、光电转换效率(PCE)和串联电阻(Rs)等性能参数呈现出了规律 性变化,当ZnO层厚度比较 薄时,器件PCE随着厚度的增加不断增大,当ZnO层厚度为53nm时,器件PCE达到最高为1.13%, 对应的Jsc、Voc、FF分别为2.82mA·cm-2、0. 84V、45.86%,Rs为66.2Ω·cm2,当ZnO层厚度继续增 加时,器件PCE开始减小。对比没有ZnO阴极修饰层,器件最优时 的Jsc、Voc、FF和PCE 分别提高了49%、17%,Rs降低了56%。  相似文献   

9.
采用一步法制作了基于 n-i-p结构的钙钛矿太阳电池。为了提高钙钛矿活性层以及TiO2与钙钛矿活性层接触面的质量,用 MAI、MABr和PbI2溶液对TiO2层进行预处理,研究了预处理对电池性能的影响。结果显示对TiO2进行预处理能够改善钙钛矿活性层薄膜的质量并提升钙钛矿太阳电池的性能。通过溶液预处理,太阳电池的能量转换效率和器件稳定性有显著提高,同时滞后效应明显减弱。  相似文献   

10.
致密层作为钙钛矿太阳电池的重要组成部分, 对其制备方法, 工艺及微结构等性质的研究对提高钙钛矿太阳电池的光伏性能具有重要影响. 本文利用介稳态的TiCl4醇水溶液作为前驱体溶液, 通过旋涂水解制备TiO2致密层, 并研究了前驱体溶液不同醇水比对致密层微结构及其相应太阳电池光伏性能的影响. 结果表明, 将2 mol.L-1的TiCl4的水溶液按醇水体积比3:1的比例用异丙醇稀释后所制备的TiO2致密层其厚度为126 nm, 且相应的太阳电池取得最高的光电转换效率10.6 %.  相似文献   

11.
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   

12.
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   

13.
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   

14.
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   

15.
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   

16.
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   

17.
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.  相似文献   

18.
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   

19.
The effect of laser microbeam trapping the bioparticles has been appfied widely in the biology .However the micromechanism of the acting that realizes the laser-microbeam trapping bioparticles is still lacking. In this paper ,the act microchenism of the gradiant force of laser microbeam for the bioparticles is analysed by means of quantum theory ,The result accords with our experiment.  相似文献   

20.
Using multiple importance sampling (MIS) technique, the optical communication system performance affected by polarization-mode dispersion (PMD) and polarization-dependent loss (PDL) is simulated numerically. The power penalties and system outage probabilities are obtained for optical communication systems with on-off keying (OOK) or differential phase shift keying (DPSK) modulation. The simulation results show that DPSK always performs better than OOK. When the system has moderate PDL (about 1.5 dB), it is necessary to compensate effectively the fiber PMD in order to enhance the system tolerance to the PMD and PDL. However, the efficiency of PMD compensation will degrade rapidly when the PMD of the whole optical link drops into the low value.  相似文献   

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