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激光沉积超导薄膜过程中出射粒子速度的飞行时间谱分析 总被引:1,自引:1,他引:0
采用飞行时间谱技术,测量了准分子激光烧蚀沉积高温超导薄膜过程中,由靶面出射粒子的飞行速度。研究了粒子速度与充氧压及其激光能量密度的关系。讨论了高能粒子在薄膜原位低温外延生长中的作用。 相似文献
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利用等离子体增强脉冲激光沉积系统在Si(100)基底上沉积出了高质量的o-BN薄膜,利用红外光谱(FTIR)、X射线衍射谱(XRD)和原子力显微镜照片对o-BN薄膜进行了表征.通过红外光谱(FTIR)得到o-BN薄膜的红外峰特征峰值为1189cm-1,1585cm-1和1450cm-1;由XRD谱得到o-BN薄膜的(111),(020),(021),(310)和(243)各晶面的衍射峰, 特别是(310)和(243)晶面的衍射峰非常强;通过原子力显微镜照片清楚看到BN薄膜具有尖状突起的表面形貌.
关键词:
等离子体增强脉冲激光沉积
氮化硼薄膜
X射线衍射谱 相似文献
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利用光学发射谱技术对螺旋波等离子体化学气相沉积纳米硅薄膜的等离子体内活性粒子的光发射特征进行了原位测量.研究了薄膜沉积过程中各实验参量对活性基团SiH*, Hβ以及Hα的发射谱强度的影响.实验结果表明,静态磁场的加入可显著提高反应气体 的解离效率 ;适当的氢稀释可以提高氢活性粒子的浓度,而过高的氢稀释比将使含硅活性基团浓度显著 减小;提高射频馈入功率整体上可以使各活性粒子的浓度增加,并有利于提高到达衬底表面 氢活性粒子的相对比例.结合螺旋波等离子体色散关系和等离子体特点对以上结果进行了分 析.该结果为螺旋波等离子体沉积纳米硅薄膜过程的理解及制备工艺参数的调整提供了基础 数据.
关键词:
光学发射谱
螺旋波等离子体化学气相沉积
纳米硅薄膜 相似文献
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准分子激光诱导铅等离子体中谱线Stark展宽时空特性研究 总被引:5,自引:5,他引:0
测定了激光诱导铅等离子体中铅原子和离子谱线Stark展宽的时间演化特性以及与缓冲气体压力之间的关系,由此计算得到了等离子体中电子密度的时间演化特性及其与缓冲气体压力之间的关系,实验结果表明,由不同的金属固体材料产生的激光等离子体的动力学性质差异很大,并讨论了形成这种差异的物理机制。 相似文献
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采用时间与空间分辨光谱测量技术,研究了在Ar气为缓冲气体下,用脉冲Nd:YAG激光烧蚀A1产生等离子体遥发射光谱及其随气压的变化规律,对粒子的激发机理进行了讨论认为特征谱线是由复合辐射为主要机理,并用此结论在一定程序上解释了实验结果。 相似文献
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脉冲激光烧蚀碲镉汞材料的等离子体发射谱 总被引:6,自引:0,他引:6
脉冲激光辐照处于不同背景气压下的Hg0.8Cd0.2Te材料表面,用时间和空间分辨诊断技术探测了激光照射后产生的等离子体发射谱,根据所获得的飞行时间谱测量了等离子体中粒子的出射速度,结果表明粒子速度随着出射距离的增加迅速减小,且背景气压对出射速度有很大的影响,而激光能量对粒子速度的影响不大。另外根据谱线的展宽计算了等离子体中的电子密度,结果表明,电子密度在激光辐照样品后的短时间内迅速减小,且电子密度最大的位置不是出现在靶的表面而是在距表面一定距离处。 相似文献
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采用时间与空间分辨光谱测量技术,研究了在Ar气为缓冲气体下,用脉冲Nd∶YAG激光烧蚀Al产生等离子体的发射光谱及其随气压的变化规律,对粒子的激发机理进行了讨论,认为特征谱线是由复合辐射为主要机理,并用此结论在一定程度上解释了实验结果。 相似文献
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J. Gottmann G. Schlaghecken E.W. Kreutz 《Applied Physics A: Materials Science & Processing》1999,69(7):S597-S600
The deposition of Al2O3 thin films by pulsed KrF excimer laser radiation (248 nm) on fused silica substrates is investigated as a function of the processing variables: laser fluence, processing gas pressure and target-to-substrate distance. The kinetic energy of the Al species in the laser-generated plasma, as measured by time-of-flight optical emission spectroscopy and time-of-flight quadrupole mass spectrometry, is described as a function of the type and pressure of the processing gas, the distance from target, and the laser fluence. The influence of the kinetic energy of the film-forming particles on the density and the refractive index of the resulting films, determined by ellipsometry, is investigated. The densification of the Al2O3 thin films to 94% of the bulk value is achieved by film-forming Al particles impinging on the growing surface with mean kinetic energies of about 25 eV. 相似文献
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The deposition of BaTiO3 thin films by pulsed excimer laser radiation (248 nm) on Pt/Ti/Si(111) and Pt/Ti/Si(100) substrates is investigated as a function of the processing variables laser fluence, processing gas pressure, and target-to-substrate distance under conditions of temporal and spatial properties of the involved vapour and plasma states. The kinetic energy of the species in the laser-generated plasma, as measured by time-of-flight optical emission spectroscopy and time-of-flight quadrupole mass spectrometry, is described as a function of the pressure of the processing gas, the distance from the target, and the laser fluence. The influence of the kinetic energy of the film-forming particles on the crystalline structure, defects, and orientation, and on the resulting electrical properties of the films is investigated. X-ray diffraction measurements and polarisation-dependent micro-Raman measurements reveal a c-axis orientation normal to the substrate surface, in the case of high particle energy (>50 eV), whereas at low kinetic energies (<30 eV) a [111]pc or [110]pc orientation is preferred. The ferroelectricity and the dielectric constant of the films, determined by impedance measurements, decrease with increasing kinetic energy of the film-forming particles from )r=1000-2200 to )r=200-700. This decrease correlates with the change of the orientation and with an increasing lattice constant of the films, indicating that particles with high kinetic energies produce crystal defects and stress in the growing film. 相似文献
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用PLD法成功制备了一系列高质量的MgZnO薄膜。实验中发现高脉冲能量沉积薄膜的结构和发光特性随基片温度的变化规律与低脉冲能量下的结果不一样:基片在室温时高脉冲能量制备薄膜的XRD峰的半峰全宽比高基片温度时的结果相对更小;AFM显示其颗粒变大,柱状生长突出;PL谱紫峰与绿峰强度比最大,结晶质量反而提高。另一方面,与低脉冲能量时相反,增大氧气压强后高脉冲能量沉积的薄膜XRD半峰全宽变窄。结合实验现象和表征,合理解释了高脉冲能量沉积的机理。室温制备高质量MgZnO薄膜的PLD沉积机理对于以后在柔性衬底上沉积薄膜的研究有重要的参考价值。 相似文献
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Kanji Shibagaki Kota Kawano Atsuto Mori 《Applied Physics A: Materials Science & Processing》2013,110(4):805-808
Shape-memory alloys are crucial in various industrial fields. However, a high-quality film synthesis method has not been established yet. Here we examine optimum conditions for synthesis of thin films by pulsed laser deposition of Ti–Ni alloy target in vacuum. We investigated surface morphologies and chemical compositions of the films which were obtained under various conditions. We found that the suitable Ti/Ni ratio was obtained by adjusting the distance between the target and the substrate in vacuum. In parallel, we analyzed plasma plume by optical emission spectroscopy and time-of-flight mass spectrometry. We discuss the basic behavior of ablated particles in vacuum. 相似文献
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采用脉冲激光沉积(PLD)法在单晶Si(100)衬底上生长ZnO薄膜,以X射线衍射(XRD)、原子力显微镜(AFM)和透射电镜(TEM)等手段分析了所得ZnO薄膜的晶体结构和微观形貌。优化工艺(700℃,20Pa)下生长的ZnO薄膜呈c轴高度择优取向,柱状晶垂直衬底表面生长,结构致密均匀。室温光致发光(PL)谱分析结果表明,随着薄膜生长时O2分压的增大,近带边紫外发光峰与深能级发光峰之比显著增强,表明薄膜的结晶性能和化学计量比都有了很大的改善。O2分压为20Pa时所生长的ZnO薄膜具有较理想的化学计量比和较高的光学质量。 相似文献
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Donagh O’Mahony Thomas Dumont Thomas Lippert Alexander Wokaun 《Applied Surface Science》2007,254(4):811-815
Laser ablation is widely used to assist in the fabrication of prototype lithium manganate (LiMn2O4) thin film structures for Li-ion battery electrodes via the pulsed laser deposition technique. However, films can be considerably Li and/or O deficient, depending the deposition conditions used. Here we present data on the ionic component of laser-produced plasma in laser ablation of lithium manganate with ns excimer laser. Plasma was monitored using an electrical Langmuir ion probe, in time-of-flight mode in conjunction with mass spectrometry to identify the dominant ionic species. Ablation in vacuum at ∼2.5 J cm−2 revealed the plasma's ionic component was composed primarily of singly charged Li and Mn ions. The time-of-flight data indicates significant deceleration of the plasma when ablation is carried out in an oxygen background gas pressure of the order of 10 Pa. The implications for thin film growth are considered in terms of the possible gas phase interactions and/or thin film re-sputtering yield. 相似文献