排序方式: 共有65条查询结果,搜索用时 15 毫秒
61.
High-Pressure Water-Vapor Annealing for Enhancement of a-Si:H Film Passivation of Silicon Surface
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We investigate the effect of amorphous hydrogenated silicon (a-Si:H) films passivated on silicon surfaces based on high-pressure water-vapor annealing (HWA). The effective carrier lifetime of samples reaches the maximum value after 210℃, 90min HWA. Capacitance-voltage measurement reveals that the HWA not only greatly reduces the density of interface states (Dit), but also decreases the fixed charges (Qfixed) mainly caused by bulk defects. The change of hydrogen and oxygen in the film is measured by a spectroscopic elHpsometer and a Fourier-transform infrared (FTIR) spectrometer. All these results show that HWA is a useful method to improve the passivation effect of a-Si:H films deposited on silicon surfaces. 相似文献
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63.
Determination of Thickness and Optical Constants of ZnO Thin Films Prepared by Filtered Cathode Vacuum Arc Deposition
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ZnO thin films are prepared on glass substrates by filtered cathode vacuum arc (FCVA) deposition technique. A new method is demonstrated to extract the refractive index, thickness and optical band gap of ZnO thin films from the transmission spectrum alone. The refractive index is calculated from the extremes of the interference fingers. The transmission spectrum is divided into two terms, non-interference term and interference effect term. The thickness of thin films is calculated by simulating the interference term, and the non-interference term is used to calculate optical band gap with the gained thickness. The results are compared with measurements by using an ellipsometry and a scanning electron microscope. 相似文献
64.
As proposed by Herminghaus, a hierarchical structure could render any surface nonwettable as long as the roughness amplitude at small scales is sufficient to suspend a free liquid surface. Recently we reported that the wettability of La0.7Sr0.3MnO3, an intrinsic hydrophilic oxide, can be tuned from superhydrophilicity to superhydrophobicity by hierarchical microstructures generated by annealing the coatings of La0.7Sr0.3MnO3 powder in nanometric scale at different temperatures. Here we further demonstrate the similar phenomenon observed on LaMaO3 coatings, which conforms THAT the surface geometrical structure is a key factor to determine the wettability. 相似文献
65.
中药白芍的HPLC含量测定及指纹图谱研究 总被引:1,自引:0,他引:1
建立白芍商品药材指纹图谱,并测定芍药苷含量评价药材质量。采用高效液相色谱分析,HypersilODS C18柱(4.6mm×250mm,5μm),乙腈-0.08%磷酸溶液梯度洗脱,柱温30℃。测定了市售17批白芍药材的HPLC指纹图谱,建立了白芍药材的总共有模式,计算得到各批药材的相似度,其中8批药材的相似度介于0.902—0.985。以相似度0.90为界,大于0.90认定为合格药材,小于0.90为不合格药材。本评价方法的结果与根据药典标准的划分结果一致,但更直观,可操作性更强,尤其对白芍药材中硫化物进行有效监控,还可对熏硫药材的质量控制起到示范作用。 相似文献