共查询到20条相似文献,搜索用时 125 毫秒
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采用射频磁控溅射方法,常温条件下以N2作为N掺杂源,在玻璃基底制备了N掺杂Al:ZnO薄膜。在真空氛围下对样品进行了不同温度的退火处理15 min。通过X射线衍射、霍尔效应测试、紫外-可见光谱和X射线光电子能谱(XPS)仪分析了退火对样品结构和光电性能的影响。结果表明真空400℃退火15 min时成功制备出性能优异的p型ZnO薄膜,其空穴载流子浓度为3.738×1020cm~(-3),电阻率为1.299×10~(-2)Ω·cm,样品可见光透射率达到了85%以上。XPS分析说明No受主缺陷的含量大于(N2)o施主缺陷导致薄膜实现了p型转变。 相似文献
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用电子束蒸发氧化铪靶的方法.在SOI(绝缘体上硅)材料上制备了氧化铪薄膜,随后在氮气中进行快速退火(600℃.300s)。借助掠角X射线衍射(GAXRD)、X射线光电子能谱(XPS)、高分辨透射电镜(HRTEM)技术分析了样品的微观结构.研究了样品在退火前后发生的组成及结构变化.结果表明退火后氧化铪薄膜由退火前的非晶态转变为单斜结构的多晶态,薄膜中的O/Hf原子比较退火前更接近化学计量比2。借助扩展电阻探针(SRP)技术考察了退火前后薄膜的电学性能.证明在SOI材料上制备的多晶氧化铪薄膜同样具有较好的电介质绝缘性能。 相似文献
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《真空科学与技术学报》2016,(5)
利用原子层沉积(ALD)法分别在Si和石英衬底上制备了Ti O_2薄膜,并在N2氛围下对Ti O_2薄膜样品进行退火处理。采用X射线衍射、原子力显微镜和场发扫描电子显微镜对不同退火温度下样品晶体结构、表面形貌进行了分析。利用紫外-可见分光光度计对不同退火温度下的Ti O_2薄膜进行了光学性能测试,并分析了退火温度对其光学带隙的影响。发现利用ALD方法制备的沉积态Ti O_2薄膜为高度择优取向的锐钛矿结构;当退火温度升高到600℃时,Ti O_2薄膜晶体结构类型仍为锐钛矿型,晶粒略有变大;退火态Ti O_2薄膜粗糙度比沉积态Ti O_2薄膜的粗糙度大,而且粗糙度随退火温度升高而增大。根据薄膜的透射光谱拟合了光学带隙,退火后薄膜禁带宽度略有变宽,吸收边缘发生蓝移。 相似文献
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采用真空热蒸发法制备了CsI(Tl)薄膜, 然后进行了不同温度的真空热处理.用X射线衍射仪、扫描电子显微镜、X射线荧光光谱仪及正电子寿命谱仪对CsI(Tl)薄膜样品进行了分析, 并测得了样品的光产额.结果表明, 该CsI(Tl)薄膜沿(200)晶面择优取向生长.经过较低温度退火, CsI薄膜中的Tl+离子向薄膜表面扩散, 薄膜中缺陷数量增加, 且尺寸较大, 光产额略微增高.经过250℃退火, 薄膜中低温退火所形成缺陷得到恢复, 薄膜缺陷尺寸变小, 且数目减少, 具有较好的结晶状态, 光产额提高.经过400℃退火, 薄膜结构发生显著变化, 薄膜中缺陷大幅增加, 结晶状态变差, Ti+含量减少, 光产额急剧下降. 相似文献
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Sorescu M. Grabias A. Tsakalakos L. Sands T. 《Journal of Materials Synthesis and Processing》2001,9(4):181-185
A pulsed laser deposition technique was used to obtain Fe-Cr-B-Si metallic glass in a thin film form using the amorphous Fe77Cr2B16Si5 ribbon as a target. Subsequently the as-deposited films were annealed at the same conditions as the ribbon samples in order to compare their crystallization behaviors. The structure and magnetic properties of the bulk and the surface layer of the samples were characterized by transmission and conversion electron Mössbauer spectroscopy, respectively. Significantly different crystallization behavior was observed for the ribbon and thin film samples. 相似文献
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Trilochan Sahoo V. Kannan Yeon-Tae Yu Young-Sik Park 《Materials Research Bulletin》2008,43(3):502-509
Single crystalline ZnO thin film on p-GaN/sapphire (0 0 0 1) substrate, using two different precursors by hydrothermal route at a temperature of 90 °C were successfully grown. The effect of starting precursor on crystalline nature, surface morphology and optical emission of the films were studied. ZnO thin films were grown in aqueous solution of zinc acetate and zinc nitrate. X-ray diffraction analysis revealed that all the thin films were single crystalline in nature and exhibited wurtzite symmetry and c-axis orientation. The thin films obtained with zinc nitrate had a more pitted rough surface morphology compared to the film grown in zinc acetate. However the thickness of the films remained unaffected by the nature of the starting precursor. Sharp luminescence peaks were observed from the thin films almost at identical energies but deep level emission was slightly prominent for the thin film grown in zinc nitrate. 相似文献
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The thermal metastability of iron nitride was exploited to fabricate thin-film microstructures applicable to left-handed metamaterials. A granular thin film containing dispersed iron particles was prepared by post-annealing an rf-sputter-deposited Fe0.5Al0.5N thin film with a wurtzite-type structure in a nitrogen atmosphere at 450 °C. The obtained samples showed magnetic resonance in the microwave region. Laser direct writing was also applied in a nitrogen atmosphere to an rf-sputter-deposited Fe0.7Al0.3N thin film. 200 μm-wide, 300 Ω cm iron metal lines were drawn in a host nitride film of approximately 2 kΩ cm. Combining and optimizing the above negative permeability and permittivity values should provide left-handed materials with a negative refractive index. 相似文献
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Vertically aligned nanowires and highly uniform nanoporous array thin films of PbTiO(3) are synthesized by varying anodic oxidation conditions of Ti foil followed by hydrothermal reaction in an aqueous Pb(II) acetate trihydrate solution. As-synthesized samples have single crystalline nanowire structure and polycrystalline nanoporous structure, although both are pure PbTiO(3) with a tetragonal phase. The structure of intermediate TiO(2) films obtained from different anodic oxidation conditions determines the structure of the product PbTiO(3). The relationships between these morphological structures and ferroelectric properties are investigated. Piezoresponse force microscopy reveals that both these films show ferroelectricity with clear phase contrast and well-defined hysteresis loops. The saturated longitudinal piezoelectric coefficient field (E(c)) of the nanowire sample is smaller than that of nanoporous thin film. Thus, polarization of nanowire thin film is larger in magnitude and easier to flip than that of nanoporous film. 相似文献
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本文着重阐述了非晶硅薄膜电池、多晶硅薄膜电池、铜铟硒系薄膜太阳能电池以及染料敏化二氧化钛薄膜太阳能电池生产技术方法以及研究方向,特别介绍了一些薄膜太阳能电池的实验室样品和组件的最高光电转化效率。并从材料、工艺与转换效率等方面讨论了它们的优势和不足之处。同时介绍了国内外薄膜太阳电池研究的进展,展望了薄膜太阳能电池的发展前景。 相似文献
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Grain boundary diffusion of dopants (boron and phosphorous) in silicon is discussed. The appropriate models and equations are presented both for semi-infinite and for thin film boundary conditions. Data reported in the literature for both thick and thin samples have generally been analyzed using models appropriate to diffusion in a homogeneous semi-infinite substrate. These data were reanalyzed using the appropriate boundary conditions and a more realistic model of the inhomogeneous nature of diffusion in polycrystalline samples. It was shown that, even though the relation between diffusion depth and time may be the same from bulk and grain boundary models, the diffusion coefficients determined from assuming the homogeneous semi-infinite solid may be several orders of magnitude in error for the pre-exponential factor, and the activation energy will also be wrong. Grain boundary diffusion coefficients for arsenic, boron and phosphorus in silicon were determined. 相似文献
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YSZ thin films were grown evaporating cubic and tetragonal phase ZrO2 stabilized by 8 wt.% of Y2O3 (8% of YSZ) ceramic powders by using e-beam deposition technique. Operating technical parameters that influence thin film properties were studied. The influence of substrate crystalline structure on growth of deposited YSZ thin film was analyzed there. The YSZ thin films (1.5-2 μm of thickness) were deposited on three different types of substrates: Al2O3, optical quartz (SiO2), and Alloy 600 (Fe-Ni-Cr). The dependence of substrate temperature, electron gun power, and phase of ceramic powder on thin film structure and surface morphology was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The substrate temperature was changed in the range of 20-600° C (during the YSZ thin film deposition) and its influence on the crystallinity of deposited YSZ thin films was analyzed. It was found that electron gun power and substrate temperature has the influence on the crystallite size, and texture of YSZ thin films. Also, the substrate has no influence on the crystal orientation. The crystallite size varied between 20 and 40 nm and increased linearly changing the substrate temperature. The crystal phase of evaporated YSZ powder has the influence on the structure of the deposited YSZ thin films. 相似文献
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Highly c-axis oriented AlN thin films have been deposited by reactive sputtering on different substrates. The crystallographic properties of layered film structures consisting of a piezoelectric layer, aluminum nitride (AlN), synthesized on a variety of substrates, have been examined. Aluminum nitride thin films have been deposited by reactive pulsed-DC magnetron sputtering using an aluminum target in an Ar/N2 gas mixture. The influence of the most critical deposition parameters on the AlN thin film crystallography has been investigated by means of X-ray diffraction (XRD) analysis of the rocking curve Full-Width at Half Maximum (FWHM) of the AlN-(0 0 0 2) peak. The relationship between the substrate, the synthesis parameters and the crystallographic orientation of the AlN thin films is discussed. A guide is provided showing how to optimize these conditions to obtain highly c-axis oriented AlN thin films on substrates of different nature. 相似文献
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