共查询到20条相似文献,搜索用时 87 毫秒
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采用红外椭圆偏振光谱对微波等离子体化学气相沉积法(MPCVD)和热丝化学气相沉积法(H-FCVD)制备的金刚石薄膜在红外波长范围(2.5—12.5μm)的光学参数进行了测量.建立了不同的光学模型,且在模型中采用Bruggeman有效介质近似方法综合考虑了薄膜表面和界面的椭偏效应.结果表明,MPCVD金刚石膜的椭偏数据在模型引入了厚度为77.5nm的硅表面氧化层、HFCVD金刚石膜引入879nm粗糙层之后能得到很好的拟合.最后对两种模型下金刚石薄膜的折射率和消光系数进行了计算,表明MPCVD金刚石薄膜的红外
关键词:
金刚石薄膜
红外椭圆偏振光谱
光学参数
有效介质近似 相似文献
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采用红外椭圆偏振光谱仪对不同工艺条件下制备的CVD金刚石薄膜在红外波长范围内的光学参量进行了测量,分析了工艺条件对金刚石薄膜红外光学性质的影响.获得了最佳的沉积工艺参数,优化了薄膜的制备工艺.结果表明薄膜的折射率和消光系数与薄膜质量密切相关,当温度为750℃,碳源浓度为0.9%和压强为4.0 kPa时,金刚石薄膜的红外椭偏光学性质最佳,折射率平均值为2.385,消光系数在10-4范围内,在红外波段具有良好的透过性.
关键词:
薄膜光学
红外光学性质
工艺条件
金刚石薄膜 相似文献
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利用电子回旋共振(ECR)微波等离子体辅助化学气相沉积技术、工作气氛为丙酮,在光学玻璃衬底上得到了光滑、致密、均匀的类金刚石薄膜.在工艺研究中,对等离子体中氧的存在及其作用进行了分析.原子力显微镜分析表明,薄膜的表面粗糙度小于10nm,晶粒 尺寸约为100nm.拉曼光谱和中红吸收谱研究发现,薄膜具有强烈的荧光效应,含有sp1,sp2,sp3杂化C—C,sp3杂化CH3,羰基CO、含氧多元 环以及—COOH基等.利用纳米力学探针以 及近红区红外透射谱分析了薄膜的力学及光学性能,结果表明,薄膜的显微硬度接近4
关键词:
类金刚石薄膜
ECR微波等离子体
丙酮气氛
红外光谱 相似文献
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利用直流-射频-等离子体增强化学气相沉积技术在单晶硅表面制备了类金刚石薄膜,采用原子力显微镜、Raman光谱、x射线光电子能谱、红外光谱和纳米压痕仪考察了射频功率对类金刚石薄膜表面形貌、微观结构、硬度和弹性模量的影响.结果表明,制备的薄膜具有典型的含H类金刚石结构特征,薄膜致密均匀,表面粗糙度很小.随着射频功率的升高,薄膜中成键H的含量逐渐降低,而薄膜的sp33含量、硬度以及弹性模量先升高, 后降低,并在射频功率为100W时达到最大.
关键词:
等离子增强化学气相沉积
类金刚石薄膜
射频功率
结构和性 相似文献
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在对不同有机溶剂分子结构分析的基础上,选取甲醇、DMF(N,N-二甲基甲酰胺)和乙腈溶液为碳源,以脉冲直流电源电解有机溶液的方法在Si片上制得了含氢类金刚石薄膜(DLC薄膜),并研究了退火对薄膜结构的影响.通过X射线光电子能谱(XPS),喇曼(Raman)和红外(IR)光谱对薄膜的结构进行了分析表征.XPS表明薄膜的主要成分为C,喇曼光谱显示所得薄膜为典型DLC薄膜.喇曼和红外光谱还表明,膜中含有大量H并且主要键合于sp3碳处.随着退火的进行薄膜中的H被去除.随温度升高薄膜电阻率的下
关键词:
类金刚石薄膜
退火 相似文献
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用射频等离子体方法在玻璃基底上制备了类金刚石 (DLC)薄膜。采用拉曼光谱、可见紫外近红外光谱、红外光谱等手段对经γ射线 (其平均能量为 1 2 5MeV)辐照后的类金刚石薄膜中氢含量及其变化进行了分析。结果表明 ,随γ射线辐照剂量的增加 ,薄膜中SP3C H键数量明显减少 ,与此同时 ,薄膜中氢含量也随之减少。当辐照剂量达 1× 10 5Gy时 ,SP3C H键减少了约 5 0 %。利用光学带隙数据、完全抑制网络 (FCN)理论及相关计算得出膜中氢含量为 10 %~ 2 5 % ,且其含量随辐照剂量的增加而减少。随辐照剂量增加 ,类金刚石薄膜附着力增加及红外透过率的降低进一步验证了上述结论的正确性。 相似文献
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利用电化学方法在室温下成功地沉积了类金刚石(DLC)薄膜和非晶CNx薄膜,并 对制备条件进行了讨论.通过扫描电子显微镜、傅里叶变换红外光谱技术,分析了薄膜的表面形貌和化学结合状态.场发射测量结果表明:DLC膜和非晶CNx的开启场分别为88和 10V/μm;并且在23V/μm的电场下,DLC膜和非晶CNx膜的发射电流密度分别达到10 和037mA/cm2.
关键词:
电化学沉积
类金刚石薄膜
x薄膜')" href="#">CNx薄膜
场致电子发射 相似文献
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介绍了一种同时利用椭偏仪和分光光度计精确测量薄膜光学常数的方法, 并详细比较了该方法与使用单一椭偏仪拟合结果的可靠性.采用可变入射角光谱型椭偏仪(VASE)表征了250—1700 nm波段辉光放电法沉积的类金刚石薄膜,研究发现当仅用椭偏参数拟合时,由于厚度与折射率、消光系数的强烈相关性,无法得到吸收薄膜光学常数的准确解.如果加入分光光度计测得的透射率同时拟合,得到的结果具有很好的惟一性.该方法无需设定色散模型即可快速拟合出理想的结果,特别适合于确定透明衬底上较薄吸收膜的光学常数.
关键词:
光学常数
光谱型椭偏仪
吸收薄膜
透射率 相似文献
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LIANG QiYing CHEN Jie LI Xin GAO ZhiQiang MI BaoXiu YANG ZhenHua 《中国科学:物理学 力学 天文学(英文版)》2015,(2):19-25
This work presents the study of optical constants and film thickness of blended organic thin films, emphasizing on the modeling procedure with modified genetic algorithm aided by absorption or transmittance spectra of both pure materials and the blends. Taking the blending of copper phthalocyanine(Cu Pc) and fullerene(C60) as an example, a simple, convenient and low-cost method for the determination of the optical constants and film thickness of blended organic thin films was demonstrated. New scheme for optical modeling of blended organic thin film was proposed by introducing peak energies of Cody-Lorentz oscillators of the pure materials, which were determined by fitting the film absorption of pure materials. These oscillators of pure materials could be recognized in the transmittance spectrum of their blends, and were further used as the initial searching ranges in the simulation of blended films. As a result, the constraint bounds of the unknown parameters were significantly reduced and modeling efficiency as well as fitting accuracy was improved. For instance, the fitting of the transmittance curves of blended films with different blending ratios reached reliable results in comparison with extinction coefficients obtained from experiment. 相似文献
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Influence of Concentration of Vanadium in Zinc Oxide on Structural and Optical Properties with Lower Concentration 下载免费PDF全文
ZnO films doped with different vanadium concentrations are deposited onto glass substrates by dc reactive magnetron sputtering using a zinc target doped with vanadium. The vanadium concentrations are examined by energy dispersive spectroscopy (EDS) and the charge state of vanadium in ZnO thin films is characterized by x-ray photoelectron spectroscopy. The results of x-ray diffraction (XRD) show that all the films have a wurtzite structure and grow mainly in the c-axis orientation. The grain size and residual stress in the deposited films are estimated by fitting the XRD results. The optical properties of the films are studied by measuring the transmittance. The optical constants (refractive index and extinction coefficient) and the film thickness are obtained by fitting the transmittance. All the results are discussed in relation with the doping of the vanadium. 相似文献
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Optical and Electrical Properties Evolution of Diamond-Like Carbon Thin Films with Deposition Temperature 下载免费PDF全文
Optical and electrical properties of diamond-like carbon (DLC) films deposited by pulsed laser ablation of graphite target at different substrate temperatures are reported. By varying the deposition temperature from 400 to 25℃, the film optical transparency and electrical resistivity increase severely. Most importantly, the transparency and resistivity properties of the DLC films can be tailored to approaching diamond by adjusting the deposition temperature, which is critical to many applications. DLC films deposited at low temperatures show excellent optical transmittance and high resistivity. Over the same temperature regime an increase of the spa bonded C content is observed using visible Raman spectroscopy, which is responsible for the enhanced transparency and resistivity properties. 相似文献
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Intertwisted fibrillar diamond-like carbon films prepared by electron cyclotron resonance microwave plasma enhanced chemical vapour deposition 下载免费PDF全文
In this paper, the structures, optical and mechanical properties of diamond-like carbon films are studied, which are prepared by a self-fabricated electron cyclotron resonance microwave plasma chemical vapour deposition method at room temperature in the ambient gases of mixed acetylene and nitrogen. The morphology and microstructure of the processed film are characterized by the atomic force microscope image, Raman spectra and middle Fourier transform infrared transmittance spectra, which reveal that there is an intertwisted fibrillar diamond-like structure in the film and the film is mainly composed of sp^3 CH, sp^3 C—C, sp^2 C═C, C═N and C_{60}. The film micro-hardness and bulk modulus are measured by a nano-indenter and the refractive constant and deposition rate are also calculated. 相似文献
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用直流磁控反应溅射法和不同基底温度下在玻璃底上沉积微纳结构的氧化钒薄膜,通过X射线衍射、电子扫描显微镜、UV-Vis透射、红外和拉曼光谱研究了薄膜的结构特性.在低温下制备的薄膜表现出高的光学透过特性,在基底温度低于200℃下制备的薄膜具有无定形结构,而在基底温度高于200℃时制备的薄膜具有多晶结构.薄膜的光学参数使用经... 相似文献
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椭偏仪难以精确测量透明衬底上吸收薄膜光学常数的原因:1)衬底的背面反射光为非相干光, 它的存在会极大的增加拟合难度; 2)衬底光学常数(折射率和消光系数)的差异会影响测量的准确性, 而且会在吸收薄膜的光学常数中表现出来, 需要单独测量其光学常数; 3)厚度与光学常数之间呈现强烈的关联性. 针对以上三个问题, 选择石英玻璃、载玻片、盖玻片和普通浮法玻璃作为研究对象. 采用折射率匹配法消除上述衬底背面反射光的影响. 结果显示, 折射率匹配法能够有效消除折射率在1.43-1.64、波长范围为190-1700 nm波段的石英、浮法玻璃等透明衬底的背面反射光. 之后, 通过拟合椭偏参数ψ和垂直入射时的透过率T0 分别得到以上衬底的折射率和消光系数. 拟合得到的结果与文献报道的趋势一致. 最后, 采用椭偏参数和透过率同时拟合的方法(SE+T法)得到类金刚石薄膜(沉积在石英玻璃上)和非晶硅薄膜(沉积在载玻片、盖玻片上)光学常数和厚度的准确解. 相似文献