共查询到19条相似文献,搜索用时 468 毫秒
1.
本文介绍了多孔硅(PS)二次阳极氧化(A0)过程中的电致发光现象,所设计的M/PS/Si/M肖特基结构的二极管也观察到了电致发光,本文还对它们的发光机理做了粗略地讨论。并提出要使多孔硅电致发光器件实用化,还有许多问题有待进一步解决。 相似文献
2.
3.
4.
用光致荧光谱、傅里叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)对用阳极氧化法制成的多孔硅层在1%NH3/H2O2溶液中的腐蚀现象进行了研究。红外分析表明,Si-O键和H-O键的强度随NH3/H2O2溶液的腐蚀时间的增加而增加,Si-H键强主匠随腐蚀时间增加而减少。光致荧光谱的峰值在腐蚀开始时先下降后上升,半高宽变窄,谱峰的以边明显蓝移。分析研究表明,1%NH3/H2O2溶液对多孔硅层有腐蚀 相似文献
5.
6.
7.
本文在很宽的导电范围内采用阳极氧化方法形成多孔硅。用SEM观测了多孔硅形貌、性质与腐蚀时间的关系。研究了四种不同掺杂的Si-HF系统的电流-电压特性。 相似文献
8.
9.
采用多孔氧化硅形成超薄SOI结构的研究 总被引:2,自引:1,他引:1
本文采用多孔氧化硅全隔离技术获得了硅膜厚度小于100nm、硅岛宽度大于100μm的超薄SOI(TFSOI)结构.用透视电子显微镜剖面分析技术(XTEM)、扩展电阻分析(SRP)、喇曼光谱、台阶轮廓仪和击穿电压测量等技术对多孔氧化硅超薄SOI结构进行了分析,结果表明其顶层硅膜单晶性好,硅膜和埋层氧化层界面平整.实验表明硅岛的台阶形貌及应力状况取决于阳极化反应条件.在硅膜厚约为80nm的TFSOI材料上制备了p沟MOSFET,输出特性良好. 相似文献
10.
采用横向阳极氧化技术在n型单晶硅衬底上制备多孔硅,室温下光荧光谱峰值位于688nm;表面蒸铝形成铝/多孔硅/硅的类肖特基结构,并观察到采用这种方法生长的多孔硅样品的室温电致发光。铝/多孔硅结具有良好的整流特性,在-10V内反向漏电流小于50nA,理想因子为7。室温电致发光的阈值电流为8.5mA,发光强度随正向电流的增加而加强。 相似文献
11.
12.
本文较详细地描述了多孔硅的电致发光(EL),以及发光的量子限制效应的机制,并且讨论了目前已经制备出的几种多孔硅发光二级管:Ps/电解液型,Schot-tky-Like,PN结等二极管。最后,讨论了多孔硅作为半导体光电材料所存在的一些问题。 相似文献
13.
多孔硅的应用研究进展 总被引:1,自引:0,他引:1
多孔硅是一种新型的纳米半导体光电材料,室温下具有优异的光致发光、电致发光等特性,易与现有硅技术兼容,极有可能实现硅基光电器件等多个领域的应用.扼要论述了多孔硅在绝缘材料、敏感元件及传感器、照明材料及太阳能电池、光电器件以及作为合成其它材料的模板等多个领域内的应用进展情况,并对其发展前景作了展望。 相似文献
14.
本文综述了多孔硅作了新型的光电半导体材料的最新研究进展,讨论了多孔硅的电致发光和两种不同结构的发光二极管。最后,讨论了制备多孔硅光电器件所遇到的一些问题。 相似文献
15.
16.
Si/SiO2 films have been grown using the two-target alternation magnetron sputtering technique. The thickness of the SiO2 layer in all the films was 8 nm and that of the Si layer in five types of the films ranged from 4 to 20 nm in steps of 4 nm. Visible electroluminescence (EL) has been observed from the Au/Si/SiO2/p-Si structures at a forward bias of 5 V or larger. A broad band with one peak 650–660 nm appears in all the EL spectra of the structures. The effects of the thickness of the Si layer in the Si/SiO2 films and of input electrical power on the EL spectra are studied systematically. 相似文献
17.
Min Wei Li‐Guo Sun Zhuo‐Ying Xie Jin‐Fang Zhii Akira Fujishima Yasuaki Einaga De‐Gang Fu Xue‐Mei Wang Zhong‐Ze Gu 《Advanced functional materials》2008,18(9):1414-1421
Negatively charged gold nanoparticles (AuNPs) and a polyelectrolyte (PE) have been assembled alternately on a polystyrene (PS) colloid by a layer‐by‐layer (LBL) self‐assembly technique to form three‐dimensional (Au/PAH)4/(PSS/PAH)4 multilayer‐coated PS spheres (Au/PE/PS multilayer spheres). The Au/PE/PS multilayer spheres have been used to modify a boron‐doped diamond (BDD) electrode. Cyclic voltammetry is utilized to investigate the properties of the modified electrode in a 1.0 M KCl solution that contains 5.0 × 10?3 M K3Fe(CN)6, and the result shows a dramatically decreased redox activity compared with the bare BDD electrode. The electrochemical behaviors of dopamine (DA) and ascorbic acid (AA) on the bare and modified BDD electrode are studied. The cyclic voltammetric studies indicate that the negatively charged, three‐dimensional Au/PE/PS multilayer sphere‐modified electrodes show high electrocatalytic activity and promote the oxidation of DA, whereas they inhibit the electrochemical reaction of AA, and can effectively be used to determine DA in the presence of AA with good selectivity. The detection limit of DA is 0.8 × 10?6 M in a linear range from 5 × 10?6 to 100 × 10?6 M in the presence of 1 × 10?3 M AA. 相似文献
18.
Methods are discussed for computing transient performance measures for the M/M/1 queue. These performance measures are often expressed in terms of modified Bessel functions without any discussion about computation. In fact, a common expression for the probability transition function of the M/M/1 queue length process has an infinite sum of modified Bessel functions. For actually generating numbers, however, it is convenient to use numerical integration with associated integral representations, as was first pointed out by P.M. Morse (Oper. Res., vol.3, p.255-61, 1955) 相似文献
19.
We report room-temperature measurements of the high-energy electroluminescence (EL) of InAlAs/InGaAs HEMT's lattice-matched to InP substrates. We found that both the carrier temperature and the intensity obtained from the EL signal for the 1.4-1.7 eV energy range drastically increases with increasing the variation in the potential at the drain edge in the channel. The observed features are consistent with the results of the spatial distribution measurement, which indicates that the EL comes from the drain edge. We further compared the bias-voltage dependence of the high-energy EL and the recombination-induced EL measured for the same device, and discussed the origin and the threshold energy of the respective luminescent processes 相似文献