共查询到18条相似文献,搜索用时 62 毫秒
1.
Ag/AuGeNi/n—GaSb欧姆接触的研究 总被引:1,自引:0,他引:1
研究了Ag/AuGeNi/n-GaSb在150°-450°下合金处理对欧姆接触的影响,最佳合金温度为220℃,此进接触电阻率为6.7×10^-4Ωcm^2。用AES和XRD研究了金属半导体界面处的扩散及物相变化,并讨论了接触电阻率与微结构的关系。 相似文献
2.
3.
4.
5.
6.
7.
8.
本文介绍一种新型接触式光纤高温计及其相应的测试系统,这种高潮计特别适用于高温燃气温度测量。文中还提供一些实测结果。这一研究成果从理论和实践上为动力工程中燃烧过程温度的动态测试打了了良好基础。 相似文献
9.
《内燃机与动力装置》2017,(3):10-12
针对气门落座的接触动力学问题,设计气门落座冲击试验,根据试验测得气门运动数据,分析气门与座圈之间动态接触力、相对滑移距离。结果表明气门落座是一个非线性接触的过程,在气门碰撞到座圈的时候,气门落座冲击力最大,并且随着气门落座速度的增大,气门与座圈的碰撞接触时间缩短,能量消耗加剧。 相似文献
10.
11.
碲化锌复合背接触层对碲化镉太阳电池性能的影响 总被引:15,自引:1,他引:15
碲化镉太阳电池的流行结构为n-CdS/p-CdTe。通过对其能带结构的分析。采用ZnTe:Cu作背接触层。再在p-CdTe和ZnTe;Cu之间引入不掺杂的ZnTe作过渡层,以改进这种电池的结特性和载流子收集,从实验上对三种结构的CdTe太阳电池进行了对比研究。结果表明复合的ZnTe/ZnTe:Cu背接触层。的确能大幅度提高CdTe太阳电池的转换效率。这种结构的电池经电子205计量站测试转换效率已达11.6%。 相似文献
12.
13.
a-Si:H薄膜的缺陷会给以该材料制作的半导体器件,如太阳电池、激光唱盘、光导鼓、TFT等造成疵点,降低器件的质量和成品率;而对微波功率器件,这些缺陷则是致命的危害。本文讨论表面上由细微颗粒造成的各种缺陷。揭示这些缺陷的微结构形貌,对其形成的原因进行理论分析,并就如何消除这些缺陷,制备光洁如镜的a-Si:H薄膜进行讨论。 相似文献
14.
15.
研究了热处理气氛对用无电沉积方法制备的Cd2SnO4导电膜的化学态结构和导电率的影响。X射线光电子能谱和室温电阻率测量结果表明,以氢气为热处理气氛时,薄膜中的氧空位最高,导电性好,真空处理次之,以氧气为热处理气氛时,氧空位少,薄膜的导电性能差。 相似文献
16.
以橡木锯木屑为原料,K2CO3为研究活化剂,采用化学活化法制备DCFC用活性炭,着重考察了碱炭比、活化温度、活化时间对活性炭的比表面积、孔隙率的影响,同时采用HNO3浸渍对活性炭表面进行改性及镍负载对活性炭导电性能进行改善。研究结果表明:当碱炭比为1、活化温度为900℃、活化时间为120min时,活性炭比表面积达1240m2/g,孔容积为0.768m3/g;镍负载后的活性炭体积电阻率明显下降;HNO3浸渍后,活性炭表面含氧官能团增多,灰分明显减少,但比表面积有一定下降,而体积电阻率增加明显。 相似文献
17.
Transparent conductive indium tin oxide (ITO)/metal/ITO multilayer electrodes have been prepared by sputtering at room temperature. Ag and Cu thin films with thickness ranging from 5 to 35 nm have been used as intermediate metal layer, between ITO coatings of about 30 nm thickness. Evolution of the optical and electrical characteristics of the multilayers as a function of each metal film thickness has been analyzed. High-quality transparent electrodes have been obtained, with sheet resistance below 6 Ω/sq for Ag film thickness above 10 nm or Cu film thickness above 16 nm. These multilayers also showed high transmittance in the visible spectral range, above 90% by discounting the glass substrate, with a maximum that is located at lower wavelength for Ag-based electrodes than for the Cu-based ones. After heating at 350 °C in flowing nitrogen, some improvement in the optoelectronical characteristics of the multilayer electrodes has been achieved that is related to the structural improvement of the ITO components. 相似文献
18.
Investigation of Ag-bulk/glassy-phase/Si heterostructures of printed Ag contacts on crystalline Si solar cells 总被引:1,自引:0,他引:1
Ching-Hsi Lin Song-Yeu Tsai Shih-Peng Hsu Ming-Hsun Hsieh 《Solar Energy Materials & Solar Cells》2008,92(9):1011-1015
The interface structure of screen-printed silver contacts on a crystalline silicon solar cell has been studied by transmission electron microscopy (TEM). TEM results confirmed that the glassy-phase plays an important role in contact properties. There are at least three different microstructures present in optimal fired contacts. The location where silver-bulk directly contacts silicon is observed through SEM, and this is actually a very thin glass layer in between. In addition, high-density silver embryos on silicon were found for samples fired optimally. The results presented in this study suggest that Ag-bulk/thin-glass-layer/Si contact is the most decisive path for current transportation. 相似文献