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在现有的一台蒸发镀膜机基础上,设计加工了一个双热舟化学气相沉积系统.该系统具有真空度高、升温速度快、源和衬底温度可分别控制等优点,有利于化合物半导体纳米材料的生长.利用该生长系统,通过在生长过程中掺入等电子杂质In作为表面活性剂,分别在Si衬底和3C-SiC/Si衬底上生长出高质量的具有纤锌矿结构的单晶GaN纳米线和纳米尖三棱锥.所得产物通过场发射扫描电子显微镜、高分辨透射电子显微镜、能量色散x射线谱仪、x射线衍射仪,和荧光谱仪进行表征.这里所用的生长方法新颖,生长出的GaN纳米尖三棱锥在场发射和激光方面有潜在的应用价值.
关键词:
GaN
纳米结构
透射电子显微镜
光致荧光谱 相似文献
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129.紫葳科 Bignoniaceae(1)美国凌霄 Campsis radicans(L.)Seen.(钱重海采)在武昌磨山武汉植物所、珞珈山、东湖风景区等地有栽培。花期6~9月。供观赏。(2)凌霄花 Campsis grandiflora(Thunb.)Loisel.(华师0017)在武昌珞珈山有栽培。花期6~8月。花可药用。(3)梓树 Catalpa ovata Don.(钱重海采) 相似文献
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Single crystalline ZnSe nanowires with both zincblende and wurtzite structures have been synthesized via a chemical vapour deposition method under different growth conditions. The nanowires are usually 50-80nm in diameter, and several tens of microns in length. Room-temperature photoluminescence spectra from zincblende and wurtzite ZnSe nanowires show a broad luminescence band peaked at around 2. 71 e V and a deep level emission band peaked at around 2.00 eV, respectively. Effects of post-growth annealing on the photoluminescence of these nanowires have been investigated. Strong room-temperature band-edge emission could be obtained from the annealed zincblende ZnSe nanowires. 相似文献
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研究了离子注入前后GaN的拉曼散射光谱,特别是其中几个在各种离子注入后都存在的拉曼散射峰,如298,362和661cm-1峰的性质,峰值强度随注入元素原子量、注入剂量和退火温度的变化关系.上述三个拉曼散射峰的强度都随注入元素原子量的增加而降低.当注入剂量增大时,362和661cm-1峰值强度减少,而298cm-1峰值强度却增大.随退火温度的升高,这三个拉曼散射峰的强度先增加后降低.对所观察到的实验现象和这三个峰的起源进行了分析和讨论.
关键词:
GaN
离子注入
拉曼散射
局域振动 相似文献
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使用近场光学显微术(scanning near-field optical microscopy, SNOM)研究了ZnO亚微米线端面出射性质,不同空间形貌Ⅱ-Ⅵ族半导体荧光器件光波导特性,二维光子晶体、准晶光子晶体对LED的出射增强作用以及表面等离激元(surface plasmon polariton, SPP)与半导体纳米荧光器件的相互作用,对纳米集成光路中的光源、光波导、光增强三个重要问题做了实验和理论上的分析.研究发现半导体微纳米线端面出射光束的质量与样品的直径有密切关系.通过合理地设计其直径和
关键词:
纳米集成光路
扫描近场光学显微术
光波导
光增强 相似文献
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The research on the setup and application of scanning near-field optical microscopy (SNOM) performed in our laboratory is reviewed in this report. We have constructed a versatile low temperature scanning near-field optical microscope with the capability of near-field imaging and spectroscopy, operating at liquid nitrogen temperature. A special designed coaxial double lens was used to introduce the illumination beam through a 200μm fiber; the detected optical signal was transmitted via a fiber tip to an avalanche photon detector. The performance test shows the stability of the new design. The shear force image and optical image of a standard sample are shown. A system of SNOM working at room temperature and atmosphere was used to characterize semiconductors and bio-molecular samples. It revealed the unique features of semiconductor microdisks in the near-field that is significantly different from that of far-field. The effects of different geographic microstructures on the near-field light distribution of InGaP, GaN, and InGaN multi-quantum-well microdisk were observed. 相似文献
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85.无患子科 Sapindaceae(1)倒地铃 Cardiospermum halicacabum L.(曹非采)武昌珞珈山等地有栽培。常栽于庭园作观赏植物。花期7月,果熟期8月。全草供药用,有清热解毒,消肿之效。(2)栾树 Koelreuteria paniculata Laxm.武汉各地庭园或路旁常见栽培,珞珈山有成片生长。叶可提取栲胶;花可做黄色染料; 相似文献
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使用近场光学显微术(scanning near-field optical microscopy, SNOM)研究了ZnO亚微米线端面出射性质,不同空间形貌Ⅱ-Ⅵ族半导体荧光器件光波导特性,二维光子晶体、准晶光子晶体对LED的出射增强作用以及表面等离激元(surface plasmon polariton, SPP)与半导体纳米荧光器件的相互作用,对纳米集成光路中的光源、光波导、光增强三个重要问题做了实验和理论上的分析.研究发现半导体微纳米线端面出射光束的质量与样品的直径有密切关系.通过合理地设计其直径和 相似文献
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