共查询到20条相似文献,搜索用时 125 毫秒
1.
K. A. Verkhovskaya A. A. Plakseev A. M. Lotonov N. D. Gavrilova S. G. Yudin 《Physics of the Solid State》2009,51(7):1370-1373
The dielectric dispersion of poly(vinylidene fluoride-trifluoroethylene) copolymer films prepared using the Langmuir-Blodgett technique is studied. All films of different compositions and thicknesses undergo a Debye-type dielectric relaxation. The phenomenon of critical slowing down is investigated. It is found that the relaxation time τ and the kinetic coefficient ξ depend on the thickness of the film. 相似文献
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利用过滤阴极真空电弧技术制备了sp3键含量不小于80%的四面体非晶碳(ta-C)膜.利用冷阴极潘宁离子源产生不同能量的氮离子对制备的ta-C薄膜进行轰击,通过X射线光电子能谱和原子力显微镜对薄膜表面结构与形貌进行分析研究.研究表明,随着氮离子的轰击能量的增大,薄膜中的CN键结构略有增大,形成了轻N掺杂;同时,在薄膜表层发生了sp3键结构向sp2键结构的转化;薄膜的表面粗糙度在经过氮离子轰击后从0.2 nm减小至0.18 nm,然后随着轰击能
关键词:
四面体非晶碳
X射线光电子能谱
摩擦系数 相似文献
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采用表面等离子激元波技术测定LB膜的光学参数 总被引:1,自引:1,他引:0
利用表面等离子激元波技术来测定极薄膜层的光学参量是相当灵敏的,但拟合计算结果往往会得到两组不确定的解。本文报道一种采用Otto耦合结构、通过测量相对于空气隙厚度变化取最小的反射率来唯一确定介质膜层复介电常数和厚度的方法。文章最后给出3对具有不同分子层数的Langmuir-Blodgett膜的测试结果。 相似文献
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We measure the nonlinear susceptibility of Bi(3.25)La(0.75)Ti(3)O(12) (BLT) thin films grown on quartz substrates using the Z-scan technique with picosecond laser pulses at a wavelength of 532 nm. The third-order nonlinear refractive index coefficient gamma and absorption coefficient beta of the BLT thin film are 3.1 x 10(-10) cm(2)/W and 3 x 10(-5) cm/W, respectively, which are much larger than those of most ferroelectric films. The results show that the BLT thin films on quartz substrates are good candidate materials for applications in nonlinear optical devices. 相似文献
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江月松 《光谱学与光谱分析》1999,19(2)
本文在用X-射线小角衍射对聚合与转载先后次序不同的PDALB膜进行结构表征的基础上,不同厚度PDALB膜的光声斩波频率效应说明,随着PDALB膜厚度增加,LB膜的热学性质逐渐明显。此外,还探讨了如何从PDALB膜的光声谱求得光声吸收系数问题,本文的研究结果表明,光声谱技术是研究LB膜热学特性的有效手段。 相似文献
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Size dependence of non-linear optical properties of SiO2 thin films containing InP nanocrystals 总被引:1,自引:0,他引:1
M.J. Zheng L.D. Zhang J.G. Zhang 《Applied Physics A: Materials Science & Processing》2001,73(2):183-187
SiO2 composite thin films containing InP nanocrystals were fabricated by radio-frequency magnetron co-sputtering technique. The
microstructure of the composite thin films was characterized by X-ray diffraction and Raman spectrum. The optical absorption
band edges exhibit marked blueshift with respect to bulk InP due to strong quantum confinement effect. Non-linear optical
absorption and non-linear optical refraction were studied by a Z-scan technique using a single Gaussian beam of a He-Ne laser
(632.8 nm). We observed the saturation absorption and two-photon absorption in the composite films. An enhanced third-order
non-linear optical absorption coefficient and non-linear optical refractive index were achieved in the composite films. The
nonlinear optical properties of the films display the dependence on InP nanocrystals size.
Received: 27 June 2000 / Accepted: 27 June 2000 / Published online: 13 September 2000 相似文献
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Vanadium oxide thin films on silicon (Si) substrate are grown by pulsed radio frequency (RF) magnetron sputtering technique at RF power in the range of 100–700 W at room temperature. Deposited thin films are characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques to investigate microstructural, phase, electronic structure and oxide state characteristics. The reflectance and transmittance spectra of the films and the Si substrate are recorded at the solar region (200–2300 nm) of the spectral window. Substantial reduction in reflectance and increase in transmittance is observed for the films grown beyond 200 W. Further, optical constants viz. absorption coefficient, refractive index and extinction coefficient of the deposited vanadium oxide films are evaluated. 相似文献
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江月松 《光谱学与光谱分析》1999,19(2):154-157
本在用X-射线小角衍射聚合与转载先后次序不同的PDA LB膜进行结构表征的基础上,不同厚度的PDA LB膜的光声新斩波频率效应说明,随着PDA LB膜厚度增加,LB膜的热学性质逐渐明显。此外,还探讨了如何从PDA LB膜的光声谱求得光声吸收系数问题,本的研究结果表明,光声谱技术是研究LB膜热学特性的有效手段。 相似文献
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利用等离子体化学气相沉积系统在直流电压源和射频源的双重激励下,以康宁7059玻璃为衬底制备了氢化硅薄膜.过测定氢化硅薄膜Raman光谱,对薄膜微结构进行了表征;建立氢化硅薄膜的光吸收模型,计算出薄膜的光吸收系数和光学带隙,和实验结果基本一致,说明该模型符合实验结果;并利用该模型计算的光吸收系数和光学带隙,结合AMPS软件对设计的太阳电池结构进行了模拟,给出的I-V特性曲线变化趋势与实验结果基本符合,同时对实验结果与模拟结果存在差异的原因进行了分析,并给出合理解释.
关键词:
氢化硅薄膜
光吸收系数
光吸收模型 相似文献
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Preparation and optical properties of barium titanate thin films 总被引:1,自引:0,他引:1
Wei Cai Chunlin FuJiacheng Gao Qian GuoXiaoling Deng Chaoyang Zhang 《Physica B: Condensed Matter》2011,406(19):3583-3587
Barium titanate (BTO) films were prepared by sol-gel spin-coating technique. The crystal structure and optical properties of BTO films have been investigated. The results indicate that the BTO films are single perovskite phase having tetragonal symmetry. The band gap of the BTO films increases with the increasing of layer number and decreasing of solution concentration. The transmittance and band gap of the BTO films annealed at 900 °C is more than that of the BTO films annealed at 700 °C when wavelength is 200-1000 nm. When wavelength is 400-1000 nm, the absorption coefficient α obtained by experiment is higher than that obtained by calculation (close to zero). 相似文献
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氧化钒(VOx)薄膜是一种广泛应用于红外热成像探测的薄膜材料,研究VOx薄膜的制备工艺、获取高电阻温度系数(TCR)的VOx薄膜具有重要意义。以高纯金属钒作靶材,采用射频磁控溅射的方法在室温下制备了VOx薄膜。主要研究了氩氧流量比以及功率等工艺参数对薄膜TCR的影响,获得了较好的工艺参数。采用万用表和X射线光电子能谱仪(XPS)分别测试了不同条件下射频磁控溅射法制备的VOx薄膜的电阻特性和薄膜成分,测试结果表明,采用所获得的较好工艺参数制备的VOx薄膜TCR值大于1.8%。 相似文献
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N. Ali R. Ahmed A. Shaari I. Rahim M. Shah A. Hussain N. Ahmad S. M. Abbas 《Brazilian Journal of Physics》2014,44(6):733-738
We report the deposition and characterization of tin antimony sulfide thin films on a soda glass substrate by a thermal evaporation technique. The thin films were annealed in argon gas at 150, 175, and 300 °C inside glass ampoules. The structural and optical properties of the deposited and annealed films are investigated. X-ray diffraction (XRD) patterns show that the films are polycrystalline in structure. Photoconductivity plot revealed good response in the NIR and visible regions, while the films show no transmittance below 700 nm. The absorption coefficient was of the order of 106 cm?1. Optical band gaps were also evaluated and a decrease in band gap was observed due to annealing. Hot point probe technique was employed for type of conductivity. 相似文献
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Sriram S Bhaskaran M Short KT Matthews GI Holland AS 《Micron (Oxford, England : 1993)》2009,40(1):109-113
This article introduces a technique for observing and quantifying the piezoelectric response of thin films, using standard atomic force microscopes (AFMs). The technique has been developed and verified using strontium-doped lead zirconate titanate (PSZT) thin films, which are known for their high piezoelectric response. Quantification of the electro-mechanical voltage coefficient d(33) (pm/V) is made directly based on the applied peak-to-peak voltage and the corresponding peak-to-peak displacement in the obtained scan image. Under the proposed technique the AFM is configured in contact mode, where the silicon nitride tip is set to follow the film displacement at a single point. A known sinusoidal voltage is applied across the film and the displacement determined as a function of time, rather than the typical AFM measurement of displacement versus tip position. The resulting raster image contains several bands, which are directly related to the AFM scan frequency and the applied sinusoidal voltage and its frequency. Different combinations of the AFM scan frequency and the applied sinusoid frequency have been used to characterise the PSZT thin films, with estimated values of d(33) between 109 and 205 pm/V. 相似文献
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Ayush Khare 《Journal of luminescence》2010,130(7):1268-1274
Nanocrystalline (Zn-Cd)S films have been co-deposited on glass slide substrates by chemical bath deposition (CBD) technique at 70 °C for 75 min. Electroluminescent (EL), photoluminescent (PL) and structural characteristics of these films doped with Cu have been investigated. Cu doping has significant effects on the growth, structural and optical properties of the deposited (Zn-Cd)S films. EL studies show the essentiality of copper for EL emission. The effect of Cu concentration is examined on XRD, SEM, UV-vis spectroscopy, etc. The morphology of these films investigated with SEM and XRD is used to determine crystalline nature of the films. The optical absorption coefficient of the films has been found to increase with increase in Cu concentration. Voltage and frequency dependence shows the effectiveness of acceleration-collision mechanism. The trap-depth values are calculated from temperature dependence of EL brightness. 相似文献
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A. V. Khomchenko I. U. Primak A. B. Sotsky I. A. Korneeva N. A. Krekatsen A. N. Pyatlitski 《Bulletin of the Russian Academy of Sciences: Physics》2016,80(4):431-434
A new noncontact technique is proposed for determining the parameters of nanosized metal coatings (absorption coefficients, refractive indices, and thicknesses). It is based on processing the measured angular dependence of the energy reflection coefficient of a polarized laser beam reflected by a thin-film structure surface. Features of determining the parameters of films on silicon substrates have been considered. 相似文献
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Aluminum–antimony (Al–Sb) seems to be a promising semiconducting material for high-temperature application especially for
transistors and P–N junction diodes and is a highly coefficient solar material. No attempt has been made to study the bilayer
diffusion properties of Al–Sb thin film by plasma exposure. In this paper, the characterization of plasma-exposed Al–Sb bilayer
thin films is presented. Thin films were coated by thermal vapor coating technique, and after coating, the sample was annealed
and exposed with plasma. Results were obtained from optical band gap data and X-ray diffraction for treated and untreated
Al–Sb thin films, and these results were compared with annealed Al–Sb thin films. 相似文献