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Orientation effects on the bandgap and dispersion behavior of 0.91Pb(Zn_(1/3)Nb_(2/3))O_3-0.09PbTiO_3 single crystals 下载免费PDF全文
0.91Pb(Zn1/3Nb2/3)O3--0.09PbTiO3 (PZN--9%PT) single crystals with different orientations are investigated by using a spectroscopic ellipsometer, and the refractive indices and the extinction coefficients are obtained. The Sellmeier dispersion equations for the refractive indices are obtained by the least square fitting, which can be used to calculate the refractive indices in a low absorption wavelength range. Average Sellmeier oscillator parameters Eo, $\lambda$o, So, and Ed are calculated by fitting with the single-term oscillator equation, which are related directly to the electronic energy band structure. The optical energy bandgaps are obtained from the absorption coefficient spectra. Our results show that the optical properties of [001] and [111] poled crystals are very similar, but quite different from those of the [011] poled crystal. 相似文献
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以自制氢氧化铌、化学试剂碳酸钾、碳酸钠为原料,柠檬酸(CA)为螯合剂,乙二醇(EG)为酯化剂,采用水热辅助聚合物前驱体法在SiO2/Si基板上制备了铌酸钾钠(KNN)薄膜.研究了CA和EG用量对溶胶性能的影响,衬底和退火温度对薄膜的影响.结果表明,当n(CA):n(金属离子)=3:1,n(CA):n(EG)=1:2时,可获得稳定性好的溶胶.以水热处理过的Si片为基板得到的薄膜结晶性和致密性都有了很大的改善;随着退火温度的升高,薄膜的结晶性越来越好,所得薄膜粒径均匀,无裂纹,有定向生长的趋势. 相似文献
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Orientation effects on the bandgap and dispersion behavior of 0.91Pb(Zn<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-0.09PbTiO<sub>3</sub> single crystals 下载免费PDF全文
0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO 3(PZN-9%PT) single crystals with different orientations are investigated by using a spectroscopic ellipsometer,and the refractive indices and the extinction coefficients are obtained.The Sellmeier dispersion equations for the refractive indices are obtained by the least square fitting,which can be used to calculate the refractive indices in a low absorption wavelength range.Average Sellmeier oscillator parameters E o,λ o,S o,and E d are calculated by fitting with the single-term oscillator equation,which are related directly to the electronic energy band structure.The optical energy bandgaps are obtained from the absorption coefficient spectra.Our results show that the optical properties of [001] and [111] poled crystals are very similar,but quite different from those of the [011] poled crystal. 相似文献
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聚合物前驱体法制备铌酸钾钠薄膜 总被引:3,自引:2,他引:1
以加入和不加入草酸铵两种方法制备氢氧化铌。以碳酸钾、碳酸钠和制得的氢氧化铌为原料,柠檬酸为螯合剂,乙二醇为酯化剂,通过聚合物前驱体法在SiO2/Si基板上制备了铌酸钾钠(KNN)薄膜。研究了草酸铵的添加和不同退火温度对KNN薄膜性质的影响。结果显示:在pH=7.5,金属阳离子与柠檬酸摩尔比为1:3,柠檬酸与乙二醇的摩尔比为2:1时,可以获得均匀稳定的KNN前驱体溶胶。草酸铵的加入优化了薄膜的性能;随着退火温度的增加,薄膜的致密度越来越高。退火温度在850℃时,薄膜结晶性相对较好;900℃退火处理后,薄膜晶粒有定向生长趋势。 相似文献
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过渡金属硫化物因能带结构与层数具有明显的依赖关系而受到广泛关注,尤其是二维二硫化钼(MoS2)薄膜因其优良的光电性能而成为研究热点。目前,化学气相沉积法(CVD)和剥离法已成为制备MoS2薄膜的主要方法,但这两种方法均存在难以精确控制MoS2层数的问题,研究证实通过刻蚀手段能够对MoS2薄膜层数进行进一步加工,从而得到单层或特定层数的样品。本文综述了基于不同刻蚀原理的MoS2薄膜刻蚀技术的国内外研究进展,分析讨论了不同刻蚀技术对刻蚀后MoS2薄膜质量的影响,介绍了MoS2刻蚀方法在场效应晶体管(FET)以及其他光电器件领域的实际应用和发展前景,最后对将来研究中需要着力解决的问题进行了展望。 相似文献
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