【摘 要】
：
Thin films comprising nitrogen-doped ultrananocrystalline diamond/hydrogenated amorphous-carbon (UNCD/a-C:H) composite films were experimentally investigated. The prepared films were grown on Si substrates by the coaxial arc plasma deposition method. They
【机 构】
：
DepartmentofElectricalEngineering,CollegeofEngineering,QassimUniversity,Unaizah56452,SaudiArabiaDepa
【出 处】
：
JournalofSemiconductors
论文部分内容阅读
Thin films comprising nitrogen-doped ultrananocrystalline diamond/hydrogenated amorphous-carbon (UNCD/a-C:H) composite films were experimentally investigated. The prepared films were grown on Si substrates by the coaxial arc plasma deposition method. They were characterized by temperature-dependent capacitance-frequency measurements in the temperature and frequency ranges of 300–400 K and 50 kHz–2 MHz, respectively. The energy distribution of trap density of states in the films was extracted using a simple technique utilizing the measured capacitance-frequency characteristics. In the measured temperature range, the energy-distributed traps exhibited Gaussian-distributed states with peak values lie in the range: 2.84 × 1016–2.73 × 1017 eV–1cm–3 and centered at energies of 120–233 meV below the conduction band. These states are generated due to a large amount of sp2-C and π-bond states, localized in GBs of the UNCD/a-C:H film. The attained defect parameters are accommodating to understand basic electrical properties of UNCD/a-C:H composite and can be adopted to suppress defects in the UNCD-based materials.
其他文献
提出了一种提高扫频光学相干层析成像(SSOCT)系统灵敏度的方法。在SSOCT系统中, 当平衡探测器前耦合器的分束比不是50%∶50%时, 会在探测的干涉信号中引入直流偏置, 从而影响系统的灵敏度。分析了干涉信号中引入直流偏置时耦合器分束比对系统灵敏度的影响, 证明了通过调节耦合器的分束比并增加参考臂能量的方法可以提高系统的灵敏度。基于实验中SSOCT系统各器件的参数, 对系统的灵敏度进行了数值模拟, 模拟结果证明了所提方法的有效性, 灵敏度测试实验结果表明应用所提方法后系统的灵敏度提高了2.3 dB。
生物发光断层成像(BLT)是一种低成本、高灵敏、具有巨大潜力的光学分子成像模态,高效稳定的重建算法是将其推向实用的关键。为克服BLT重建的高不适定性,提出了基于非凸L_(1-2)正则化的重建方法,采用凸差分算法来解决非凸泛函最小化问题,在每一步迭代中采用带自适应惩罚项的交替方向乘子法高效求解。为评估该方法的有效性和稳健性,设计了单光源和双光源数字鼠仿体实验,并与3个典型的重建算法进行对比,仿真实验
Ablation experiments with femtosecond (fs) laser pulse (pulse duration 37 fs, wavelength 800 nm) on organic polymers have been performed in air. The ablation threshold is found to be only several nanojoules. The diameters of the dots ablated in the organi
本文主要介绍苏联科学院П. H.列别捷夫物理研究所获得的结果并被发展了的思想，对其它实验室所获得的结果仅取其与我们的研究结果相同的部分。略去了化学激光器的装置和原理的许多详细内容。目前这类报导见于许多今开出版物翻版出来的普及性的文章。
We fabricate and measure a multilayer-coated ion-beam-etched laminar grating for the extreme ultraviolet wavelength region. The fabrication process is carefully controlled so that the grating groove and multilayer-coating parameters well meet the design t
We develop and build a new type of inspection car. A beam that is not rigidly connected to the train axle boxes and can absorb the vibration and impact caused by the high speed train is used, and a laser-camera measurement system based on the machine visi
测量了瞬态二波耦合增益随泵浦光与探测光相对延迟改变而变化的曲线,并分析了瞬态二波耦合中各种过程的特性。预计并观察到了耦合光偏振的改变,证明了ps脉冲二波耦合是一种实现ps光开关的新途径。
针对直线特征,提出了基于两条垂直直线特征双目视觉位姿测量解析算法。该算法根据直线特征和其在摄像机图像上投影直线共面性质建立模型,利用单位四元素法简化了投影模型变量,进而在仅知被测物体上两条直线相互垂直的信息,利用两条垂线投影在两个摄像机图像上四条直线图像,求解出被测物体的位姿参数。同时分析了退化情况下位姿求解方法,即当直线向量平行于两个摄像机基线向量时,直线向量在左右摄像机投影到同一条直线上时的位
为实现低损耗、抗弯曲的中红外激光传输，在3 μm波段研究超低损耗空芯嵌套式反谐振无节点光纤，采用有限元法对空芯光纤的结构参数（管厚、包层毛细管外径、纤芯直径和嵌套管外径）进行数值仿真，并在3 μm波段实现低至0.52 dB/km的光纤传输损耗。通过对空芯反谐振光纤和空芯嵌套式反谐振无节点光纤的弯曲损耗及泄漏损耗的对比研究，证明空芯嵌套式反谐振无节点光纤相比于空芯反谐振光纤在宽光谱范围内具有更低的传输损耗（损耗比最高可达22.87 dB）、更好的抗弯曲性能（弯曲半径为6.5 cm的损耗小于0.1 dB/m）
制备了一种新型多孔聚丙烯酸/十六烷基三甲基溴化铵聚吡咯凝胶电解质，并将其应用于柔性基染料敏化太阳电池(DSSC)。通过扫描电镜表征、热重分析测试、电化学性能测试和柔性电池光电性能测试等手段，分析了凝胶电解质对柔性基DSSC的光电性能影响。研究结果表明：随着聚吡咯的引入，提高凝胶电解质导电性以及催化电解质中的I-/I-3离子电对等性能，最终在100 mW/cm2[大气质量(AM)1.5]光照条件下，测得基于该准固态凝胶电解质的柔性基DSSC光电转换效率达1.28%。