共查询到17条相似文献,搜索用时 125 毫秒
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利用Ge与不同衬底形成的不同晶格失配度来调节有盖层的张应变Ge量子点的光电特性。通过有限元方法模拟并获得张应变Ge量子点内的应变分布,而后通过形变势理论和有效质量近似计算得到量子点的电子结构。与无盖层张应变Ge量子点相比,有盖层Ge量子点能保持更大的应变量。另外,随着量子点尺寸和晶格失配度的增大,导带Γ谷与导带L谷的能量差缩减,最终使Ge转变为直接带隙材料。直接带隙能量随着量子点尺寸的增大而减小。该研究结果表明张应变Ge量子点是制备包含激光器在内的Si基光源的理想材料,在未来光电子应用中有巨大潜力。 相似文献
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采用LP-MOVPE技术,在(001)InP衬底上生长的InAs/InP自组装量子点是无序的。为了解决这个问题,在InP衬底上先生长张应变的GaAs层,然后再生长InAs层,可得到有序化排列的量子点。本文对张应变GaAs层引入使量子点有序化排列的机理进行了分析,为生长有序化、高密度,均匀性好自组装量子点提供了依据。 相似文献
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田允允 《中国新技术新产品》2019,(15)
以量子点为基础的显示技术能够更加还原大自然中的各种颜色,满足人们对显示体验不断提升的需求。该文主要以CNABS中文数据库和SIPOABS英文数据库中的检索结果为分析样本,从专利文献的视角,针对量子点显示相关专利申请趋势,全球目标市场国的申请量以及全球申请人分布情况统计和可视化分析,并对量子点显示专利的技术发展分支统计分析。 相似文献
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硫化铜量子点作为一种p型半导体纳米晶,具有很强的表面等离子体共振效应、低的毒性以及独特的光学和电学性能,在光催化、生物技术、光电转换材料领域受到了极大关注。由于单分散的硫化铜量子点的制备过程复杂,效率较低,并且纯的硫化铜量子点电导率较低,这极大地限制了其在能量存储器件方面的应用。此外,由于硫化铜量子点复杂的能带结构和独特的p型半导体特性,针对硫化铜量子点的光学性能调控尚不成熟。基于此,本文综述了硫化铜量子点在制备方面的研究现状与取得的进展,介绍了硫化铜量子点的能带结构、晶体结构,及其在量子点敏化太阳能电池、光催化降解污染物、肿瘤细胞诊断与治疗等方面的研究进展,并对硫化铜量子点或Cu系量子点更进一步的研究、开发应用提出了几点建议。 相似文献
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D. R. Mašović 《Journal of Modern Optics》2017,64(12):1199-1207
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《Journal of Experimental Nanoscience》2013,8(4):348-356
Histidine functionalised CdS quantum dots (QDs) have been synthesised by sonochemical method. Transmission Electron Microscopy (TEM) observation shows that the histidine functionalised CdS QDs are well-defined, nearly spherical particles. The X-ray diffraction pattern indicates formation of cubic phase of CdS/histidine QDs. The absorption spectra confirm quantum confinement of histidine functionalised CdS QDs. The photoluminescence property of CdS/histidine QDs is found better than that of CdS QDs. Histidine functionalised CdS QDs, in which histidine acts as a biocompatibiliser, can find potential applications in the biological fields. 相似文献
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Jay Oswald Eugen Wintersberger Günther Bauer Ted Belytschko 《International journal for numerical methods in engineering》2011,85(7):920-938
This paper presents a higher‐order method for modeling dislocations with the extended finite element method (XFEM). This method is applicable to complex geometries, interfaces with lattice mismatch strains, and both anisotropic and spatially non‐uniform material properties. A numerical procedure for computing the J‐integral around a dislocation core to determine the energy release rate for a virtual advance of the dislocation line is described. Several examples in three dimensions illustrate the applicability of this method to material interfaces and semiconductor heterostructures, specifically the computation of the energetics of systems of dislocations in SiGe islands deposited on pure Si substrates. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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Yingying WEI Lin CHEN Shaoban ZHAO Xuguang LIU Yongzhen YANG Jinglei DU Qiang LI Shiping YU 《材料科学前沿(英文版)》2021,15(2):253
High fluorescence quantum yield (QY), excellent fluorescence stability, and low toxicity are essential for a good cellular imaging fluorescent probe. Green-emissive carbon quantum dots (CQDs) with many advantages, such as unique fluorescence properties, anti-photobleaching, low toxicity, fine biocompatibility and high penetration depth in tissues, have been considered as a potential candidate in cell imaging fluorescent probes. Herein, N, S-codoped green-emissive CQDs (QY= 64.03%) were synthesized by the one-step hydrothermal method, with m-phenylenediamine as the carbon and nitrogen source, and L-cysteine as the nitrogen and sulfur dopant, under the optimum condition of 200 °C reaction for 2 h. Their luminescence was found to originate from the surface state. In light of the satisfactory photobleaching resistance and the low cytotoxicity, CQDs were used as a cell imaging probe for HeLa cell imaging. The results clearly indicate that cells can be labeled with CQDs, which can not only enter the cytoplasm, but also enter the nucleus through the nuclear pore, showing their broad application prospect in the field of cell imaging. 相似文献