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用磁控溅射系统和快速合金化法制备了Mo/W/Ti/Au多层金属和n-GaAs材料的欧姆接触,在溅射金属层之前分别用HCl溶液和(NH4)2S溶液对n-GaAs材料的表面进行处理.用传输线法对比接触电阻进行了测试,并利用俄歇电子能谱(AES)、X射线衍射图谱(XRD)对接触的微观结构进行了分析.结果表明,用(NH4)2S溶液对n-GaAs材料表面进行处理后,比接触电阻最小;在700℃快速合金化后获得最低的比接触电阻,约为4.5×10-6Ω·cm2.这是由于(NH4)2S溶液钝化处理后降低了GaAs的表面态密度,消除了费米能级钉扎效应,从而改善了难熔金属与GaAs的接触特性. 相似文献
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研究了应用于日盲探测器的高Al组分Si掺杂n型Al0.6Ga0.4N与两层金属层Ti(20nm)/Al(100nm)之间的欧姆接触.在制作金属电极前用煮沸王水对样片进行表面预处理,金属制作后再在N2氛围中做快速热退火处理.使用高精度XRD测试样品表面特性,并对不同温度下的情况进行比较.样品的比接触电阻率是用环形传输线模型通过I-V测试得到.670℃下90s退火得到最优ρc为3.42×10-4Ω·cm^2.将该处理方法应用到实际的背照式AlGaN p-i-n日盲探测器中,探测器的光谱响应度和反向特性等参数得到很大的优化. 相似文献
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3 对振膜式ECM中背极材料的讨论
振膜式ECM中振膜兼有2种功能:(1)有振膜的功能;(2)有驻极体的功能,它能提供电场,使ECM不需外加偏压。一般用FEP薄膜经过绷紧后再极化充电完成。而作为下电极的背极则是由铜一锌合金的黄铜作为主要材料被应用的。为了研究背极材料对ECM特性的影响.笔者先讨论如图10所示的Cu—Zn合金相图。 相似文献
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基于再生锁模光纤激光器的RZ码光源研究 总被引:1,自引:1,他引:0
进行了再生锁模光纤激光器(RMLFL)在光学归零(RZ)光源应用的实验。通过外接马赫一曾德(M-Z)调制器加伪随机码调制得到良好的背背(back-to-back)测试眼罔,获得了可以满足长途传输要求的10Gbit/s波长可调谐RZ码光源,稳定输出脉宽5ps,可通过4路复用后升级为40bit/s RZ光源。同时,将这种RZ码光源与利用两级调制方式产生的RZ码光源作了比较,结果表明,前一种方案在脉宽、信噪比等方面具有明显优势。 相似文献
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大型机场的场面多点定位(MLAT)系统具有接收站布局复杂和非视距(NLOS)传播严重的特点,为了选择最佳定位站点组合和消除NLOS对目标定位的影响,需要提供一个目标的估计位置。以往采用目标前次定位位置的方式存在将前次定位误差引入到当次目标信号处理中的缺陷。为了实现多点定位系统对目标当次信号处理的独立性,采用一种基于最优水平精度因子(HDOP)的目标位置估算方法,利用当次测量达到时间(TOA)信息,基于最优HDOP,通过快速优选、位置一致性判定和优化站点等方法,快速估计出目标当次二维位置,数据处理系统利用当次目标估计位置完成最佳站点组合选择和NLOS处理。仿真测试和机场场面真实数据测试验证了该方法的可行性,同时表明利用该方法提高了多点定位系统的定位连续性和定位精度。 相似文献
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基于化学水浴沉积法以硫脲为硫源,醋酸镉为镉源,氨水作为缓冲剂,制备太阳能电池用半导体薄膜硫化镉(CdS),研究不同的退火温度和是否涂敷CdCl2溶液对CdS薄膜的影响。采用X线衍射仪、电子扫描电镜和紫外/可见光分光光度计研究了不同退火工艺对硫化镉薄膜的结构、形貌及光学特性的影响。实验表明,悬涂CdCl2溶液退火处理可明显改善CdS薄膜的结晶及其光学性质,最佳退火温度为400℃,退火时间为60min。 相似文献
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CdTe Films Deposited by Closed—space Sublimation 总被引:1,自引:0,他引:1
CdTe films are prepared by closed-space sublimation technology,Dependence of film crystalline on substrate materials and substrate temperature is investigated.It is found that films exhibit higher crystallinity at substrate temperature higher than 400℃.And the CdTe films deposited on CdS films with higher crystallinity have bigger crystallite and higher uniformity.Treatment with CdCl2 methanol solution promotes the crystallite growth of CdTe films during annealing. 相似文献
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CdS窗口层光谱透射率的提高对CdTe-HgCdTe叠层太阳电池有效利用入射太阳光并增大电池的短路电流密度有重要的影响。通过研究化学水浴法、近空间升华法和磁控溅射法制备的CdS薄膜在CdCl2退火前后的光谱平均透过率和短路电流密度损失表明:在光谱区520~820 nm,化学水浴法制备的CdS薄膜在退火前后具有最高的光谱平均透过率,对应的CdTe顶电池有最小的短路电流密度损失;在光谱区820~1150和520~1150 nm,磁控溅射法制备的CdS薄膜在退火前后均具有最高的光谱平均透过率,对应的HgCdTe底电池和CdTe-HgCdTe叠层太阳电池有最小的短路电流密度损失。在光谱区520~820、820~1150和520~1150 nm,CdCl2退火可以显著增大CdS薄膜的光谱平均透过率,降低对应CdTe顶电池、HgCdTe底电池和CdTe-HgCdTe叠层电池的短路电流密度损失。 相似文献
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A. N. Tiwari G. Khrypunov F. Kurdzesau D. L. Btzner A. Romeo H. Zogg 《Progress in Photovoltaics: Research and Applications》2004,12(1):33-38
Polycrystalline thin‐film CdTe/CdS solar cells have been developed in a configuration in which a transparent conducting layer of indium tin oxide (ITO) has been used for the first time as a back electrical contact on p‐CdTe. Solar cells of 7·9% efficiency were developed on SnOx:F‐coated glass substrates with a low‐temperature (<450°C) high‐vacuum evaporation method. After the CdCl2 annealing treatment of the CdTe/CdS stack, a bromine methanol solution was used for etching the CdTe surface prior to the ITO deposition. The unique features of this solar cell with both front and back contacts being transparent and conducting are that the cell can be illuminated from either or both sides simultaneously like a ‘bi‐facial’ cell, and it can be used in tandem solar cells. The solar cells with transparent conducting oxide back contact show long‐term stable performance under accelerated test conditions. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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N. Lovergine P. Prete A. Cola M. Mazzer D. Cannoletta A. M. Mancini 《Journal of Electronic Materials》1999,28(6):695-699
The growth of thick CdTe epitaxial layers by the hydrogen transport vapor phase epitaxy (H2T-VPE) method is reported for the first time. The thermodynamics of the H2 transport method of CdTe is analyzed to determine the equilibrium partial pressures of the molecular species in the vapor
and its supersaturation as a function of growth conditions. (100)-oriented CdTe epilayers are successfully grown by H2T-VPE on hybrid ZnTe/GaAs(100) substrates prepared by metalorganic vapor phase epitaxy. Growth rates up to 10 μm/h are obtained
at temperatures ∼760°C and with the CdTe source temperature at 827°C. The achievement of even higher growth rates can be foreseen
by using the present method under slightly different conditions; several hundreds micron thick CdTe layers can be thus grown
by the H2T-VPE. CdTe samples have mirror-like, nearly featureless surfaces. Also, CdTe epilayers have shown a medium-to-high resistivity
at room temperature, possibly as a result of compensation by donor impurities diffusing from GaAs. Still the growth of highly
resistive layers by in-situ chlorine doping during the H2T-VPE growth is possible. In summary, H2T-VPE is a potential alternative to traditional melt- and vapor-growth methods for the synthesis of detector-grade CdTe for
application to the 1–100 keV x-ray energy range. 相似文献
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C. B. Norris 《Journal of Electronic Materials》1980,9(3):499-512
Vapor-phase-grown CdTe is interesting in that it represents an alternate growth technology for CdTe and in addition provides
an alternate setting in which to observe the poorly-understood 1.4 eV luminescence that has received much attention in liquid-phase-grown
material. In this paper we present the first cathodoluminescence measurements in vapor-phase-grown CdTe. We describe the injection
level dependence, temperature dependence, and frequency response of the luminescence of vapor-phase-grown CdTe and compare
the results to those reported previously on liquid-phase-grown CdTe. 相似文献
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氩氧气氛下沉积的CdTe薄膜及太阳电池的性质 总被引:9,自引:2,他引:7
研究了在氩氧气氛下近空间升华沉积CdTe的技术.发展了在表面十分平整的玻璃衬底上沉积优质CdTe薄膜的方法,对比了在玻璃衬底和CdS薄膜上CdTe薄膜的结构特征.通过研究氧分压对CdTe薄膜择优取向的影响,证实了在恰当的近空间升华沉积过程中,两种衬底上的CdTe薄膜具有相同的结构.研究了玻璃衬底上CdTe薄膜的电学与光学性质,观察了后处理对上述薄膜性质的影响,并研制出了效率达1338%的小面积CdTe 薄膜太阳电池. 相似文献