共查询到20条相似文献,搜索用时 62 毫秒
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为降低ITO薄膜对紫外波段的光吸收,制备低电压高功率的紫外LED,研究了一种基于金属掺杂ITO透明导电层的365 nm紫外LED的制备工艺。利用1 cm厚的石英片生长了不同厚度ITO薄膜以及在ITO上掺杂不同金属的新型薄膜,并研究了在不同的退火条件下这种薄膜的电阻和透过率,分析了掺杂金属ITO薄膜的带隙变化。将这种掺杂的ITO薄膜生长在365 nm外延片上并完成电极生长,制备成14 mil×28 mil的正装LED芯片。利用电致发光(EL)设备对LED光电性能进行测试并对比。实验结果表明:掺Al金属的ITO薄膜能够相对ITO薄膜的带隙提高0.15 eV。在600℃退火后,方块电阻降低6.2 Ω/□,透过率在356 nm处达到90.8%。在120 mA注入电流下,365 nm LED的电压降低0.3 V,功率提高14.7%。ITO薄膜掺金属能够影响薄膜带隙,改变紫光LED光电性能。 相似文献
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ITO透明导电膜玻璃的翘曲度是评价大尺寸薄基片ITO玻璃的重要指标之一。利用磁控射频溅射技术制备了ITO薄膜。研究了基片加热前、后的翘曲度和ITO膜层应力对ITO玻璃翘曲度的影响以及ITO成膜温度分布对ITO玻璃翘曲度的影响。结果表明,薄基片ITO玻璃的翘曲度主要是在镀膜时ITO膜层压应力大引起的,选择合适的成膜温度分布可明显减小ITO玻璃的翘曲度。 相似文献
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根据红外辐射理论和薄膜光学原理计算了高品质ITO(indium tin oxide)导电膜的红外发射 率,其理论曲线与实测曲线基本符合. 并得出方块电阻小于30Ω时,ITO膜在红外波段8—14μ m的平均红外发射率理论值小于0.1.实际制备方块电阻小于10Ω的ITO膜具有优良的红外隐身 性能. 讨论了高品质ITO膜具有低红外发射率的物理机理,并提出了低红外发射率临界方块电 阻值,这有利於理论研究和工艺制备红外隐身ITO膜.
关键词:
红外发射率
ITO薄膜
理论计算
方块电阻 相似文献
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在聚对苯二甲酸乙二醇酯(PET)柔性衬底上采用直流磁控溅射技术制备了氧化铟锡(ITO)透明导电薄膜,研究了衬底温度、溅射功率和溅射压强等工艺条件对薄膜光电性能的影响,并利用原子力显微镜(AFM)表征了衬底及ITO薄膜的表面形貌。结果表明,在PET衬底温度50℃、溅射功率100W和溅射压强2.66×10-1Pa的条件下,可以得到低方阻(50Ω/□)和高透过率(>90%)的透明导电薄膜。以此柔性ITO衬底为阳极,制备了结构为PET/ITO/NPB/Alq3/Mg∶Ag的柔性有机电致发光器件,在驱动电压为13V时,器件的发光亮度达到了2834cd/m2。 相似文献
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《中国光学与应用光学文摘》2006,(1)
O484.12006010529低压反应离子镀方法制备ITO透明导电膜=Preparationof ITOfil ms by reactive lowvoltageion plating[刊,中]/徐颖(中科院长春光机所光学技术研究中心.吉林,长春(130022)),高劲松…∥光学技术.—2005,31(5).—669-671使用一种不同于溅射方法的另一种制备工艺—低压反应离子镀方法制备ITO透明导电膜。实验对不同沉积速率和不同氧气流量对ITO透明导电膜的方块电阻以及光学透过率的影响进行了详细的分析,并综合比较得到了当沉积速率为0.5nm/s,氧气流量为24cm3/min时,在波长为550nm处,方块电阻为20Ω,λ=550nm,透过率为90… 相似文献
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The results of measurements of the scattering matrix at a wavelength of 0.63 μm in the range of scattering angles of 10°–155° are presented for an aqueous suspension of lead oxide containing particles of plate form and their aggregates of monomers with dimensions of ~5 nm. The results of the measurements are compared with the results of calculations for axially symmetric scatterers (ellipsoids of rotation, cylinders). It is shown that the presence of aggregates affects the scattering properties of such a medium. The results of reconstructing the distribution of particles of a disperse medium in sizes from the measurements data of the scattering matrix are presented. The reconstruction of the distributions was carried out by solving the problem of optimizing the sum of the squared deviations of the experimental and calculated values of matrix elements in the framework of the model of axially symmetric scatterers. It is shown that the distribution of particles by sizes is more accurately reconstructed by minimizing the sum of the squares of the deviations for the sum of the diagonal elements. The obtained distribution is compared with the distribution measured by the method of dynamic light scattering. 相似文献
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The problem of reconstructing the characteristics of disperse particles from measurements of scattered radiation is considered. To solve this problem, the neural network method, based on the approximation of the parameters of particles by a linear combination of the results of measurements, is used. The capabilities of the method are studied on the examples of the reconstruction of the radius and the refractive index of spherical particles from measurements (for example, in flow-type cytometers) of the luminance of radiation scattered by individual particles, as well as the reconstruction of the mean radius, the coefficient of variation, and the refractive index from measurements of the luminance of radiation scattered by an ensemble of particles. Errors in the reconstruction of the characteristics of disperse particles depending on the structure of the neural network and the parameters of particles are studied. 相似文献
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The structures of the electronic-vibrational spectra and of the excited states of a number of diphenylpolyene molecules are determined within the framework of the second approximation of the parametric method. The system of parameters of the structural fragments of molecules is improved and good agreement with spectral experiment is obtained. It is shown that there is a high degree of transferability of the polyene and acene parameters of the method and that the models obtained are adequate to the real structure of molecules. It is also shown that the method proposed makes it possible to perform predictive qualitative and quantitative calculations of the spectra of these molecules, as well as of the spectral characteristics necessary for modeling photochemical molecular transformations. In the series of diphenylpolyene molecules, an interpretation of the vibrational structure of the spectra is proposed and the specific features of variation of the geometry upon excitation of molecules are considered. 相似文献
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P. N. Alekseev E. A. Ivanov V. A. Nevinitsa N. N. Ponomarev-Stepnoi A. N. Rumyantsev V. M. Shmelev V. D. Borisevich A. Yu. Smirnov G. A. Sulaberidze 《Physics of Atomic Nuclei》2010,73(14):2264-2270
The present paper deals with investigation of the possibilities for reducing the risk of proliferation of fissionable materials
by means of increasing the degree of protection of fresh fuel intended for light-water reactors against unsanctioned use in
the case of withdrawal of a recipient country of deliveries from IAEA safeguards. It is shown that the use of recycled uranium
for manufacturing export nuclear fuel makes transfer of nuclear material removed from the fuel assemblies for weapons purposes
difficult because of the presence of isotope 232U, whose content increases when one attempts to enrich uranium extracted from fresh fuel. In combination with restricted access
to technologies for isotope separation by means of establishing international centers for uranium enrichment, this technical
measure can significantly reduce the risk of proliferation associated with export deliveries of fuel made of low-enriched
uranium. The assessment of a maximum level of contamination of nuclear material being transferred by isotope 232U for the given isotope composition of the initial fuel is obtained. The concept of further investigations of the degree of
security of export deliveries of fuel assemblies with recycled uranium intended for light-water reactors is suggested. 相似文献
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I.I. Izhnin O.I. Fitsych A.V. Voitsekhovskii A.P. Kokhanenko K.A. Lozovoy V.V. Dirko 《Opto-Electronics Review》2018,26(3):195-200
In this paper questions of optimization of growth conditions in the method of molecular beam epitaxy for creation of high-efficient quantum dot infrared photodetectors are considered. As a model material system for theoretical investigations, heterostructures with germanium-silicon quantum dots on the silicon surface are chosen. For calculations of the dependencies of quantum dots array parameters on synthesis conditions the kinetic model of growth of differently shaped quantum dots based on the general nucleation theory is proposed. The theory is improved by taking into account the change in free energy of nucleation of an island due to the formation of additional edges of islands and due to the dependence of surface energies of facets of quantum dots on the thickness of a 2D wetting layer during the Stranski–Krastanow growth. Calculations of noise and signal characteristics of infrared photodetectors based on heterostructures with quantum dots of germanium on silicon are done. Dark current in such structures caused by thermal emission and barrier tunneling of carriers, as well as detectivity of the photodetector in the approximation of limitation by generation-recombination noises are estimated. Moreover, the presence of dispersion of quantum dots by size is taken into account in the calculations of the generation-recombination noises. Results of calculations of the properties of structures with quantum dots and their dependencies on growth parameters, as well as the characteristics of quantum dot photodetectors are presented. Comparison of the estimated parameters of quantum dots ensembles and the characteristics of quantum dot photodetectors with experimental data is carried out. 相似文献
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A. G. Gudkov V. G. Tikhomirov B. R. Shub S. I. Vidyakin 《Russian Journal of Physical Chemistry B, Focus on Physics》2017,11(1):112-117
Requirements to the modeling of the effects of temperature differential and ionizing radiation on the current–voltage characteristics of high electron mobility transistors (HEMTs) were formulated. The results of modeling of the effects of temperature differential on the current–voltage characteristics of HEMTs were described. The results of analysis of the effects of ionizing radiation on the current–voltage characteristics of HEMTs were given. The results of modeling of the effects of ionizing radiation on the current–voltage characteristics of HEMTs were presented. 相似文献
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Possibilities for application of the theory of subspaces to determination of the energy of excited electronic states are studied in terms of density functional formalism. Specific features of computer implementation of the theory in a basis of spherical Gaussian functions, whose parameters are determined by minimizing the energy of the corresponding subspace of states, are discussed. The results of calculation of the energy of excited states and the excitation energies of simple atoms and molecules are presented to demonstrate the potential of the approach. 相似文献
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U. F. Bryakina T. V. Gubina V. A. Shargatov 《Russian Journal of Physical Chemistry B, Focus on Physics》2011,5(3):482-490
A sufficient condition of applicability of the model of a chemical equilibrium mixture to gasdynamic calculations based on
a comparison of the rate of change of the equilibrium concentrations of the products in gas-dynamic process with the rate
of chemical reactions leading to the establishment of chemical equilibrium is obtained. An example of using this condition
in examining the applicability of the model of a chemical equilibrium mixture to the products of detonation of spherical charges
of oxyacetylene and hydrogen-air mixtures the in the air is presented. 相似文献
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S. N. Vergeles 《Journal of Experimental and Theoretical Physics》2003,97(6):1075-1092
The problem of doubling of fermion states is studied in the framework of the theory of discrete gravitation. Examples of amorphous lattices (simplicial two-, three-, and four-dimensional complexes) free of doubling of fermion states are given. Possible consequences of this fact, such as the absence of quantum anomalies in divergence of axial currents, are considered. On the basis of the absence of axial anomalies and the finiteness of the number of physical degrees of freedom in the model of discrete quantum gravity proposed in [1] and of the continuum theory of gravitation constructed with the help of the dynamic quantization method [2], the following conclusion has been drawn: discrete quantum gravity [1] in the continuum limit is transformed into the theory of gravitation constructed in accordance with the algorithm of the dynamic quantization method [2]. 相似文献
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Visualization of scattering media upon backscattering of a linearly polarized nonmonochromatic light
Yu. P. Sinichkin D. A. Zimnyakov D. N. Agafonov L. V. Kuznetsova 《Optics and Spectroscopy》2002,93(1):102-107
The method of polarization visualization of multiply scattering macroinhomogeneous media, based on analysis of the spatial distributions of polarization characteristics of a linearly polarized radiation backscattered from a medium, is discussed. The effect of optical characteristics of the medium and the scattering geometry on the quality of the images obtained in the case of visualization of an absorbing heterogeneity immersed into a multiply scattering medium is considered. The comparative analysis of the quality of formed images was performed with the use of different polarization characteristics of the backscattered radiation as a visualization parameter. The theoretical interpretation of the obtained experimental results is given within the framework of the phenomenological approach based on the concept of the distribution of the effective optical paths of partial components of the scattered optical field. To calculate the probability density of the effective optical paths, the statistical simulation method was used. 相似文献