共查询到18条相似文献,搜索用时 78 毫秒
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量子点敏化太阳电池是兼具低成本和高理论转化效率的第三代太阳电池。量子点敏化光电极是量子点敏化太阳电池的核心部分。对量子点敏化光电极的制备方法进行了分类,综述了量子点敏化光电极制备方法的研究进展。 相似文献
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全无机铅铯卤化物CsPbX3(X=Cl, Br, I)钙钛矿型量子点(PQDs)玻璃具有高光致发光量子产率(PLQY)、可调谐发光波长、载流子迁移率高等光学特性,近几年在光电领域取得了极大的发展。在玻璃中原位成核结晶析出钙钛矿量子点,利用玻璃致密的网络结构将量子点包覆,使量子点与外界的水、气等环境隔离,可以有效解决量子点应用过程中寿命短、稳定性差等问题,使其在照明、背光显示和光探测等领域具有广阔的应用空间。本文综述了钙钛矿量子点玻璃的制备方法和成核策略,以及近几年研究人员在钙钛矿量子点玻璃性能改善和优化方面的研究进展,并展望了全无机钙钛矿量子点玻璃的未来挑战,为钙钛矿量子点玻璃的发展应用提供了参考和思路。 相似文献
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石墨烯以其优异的物理和化学性能,在锂离子电池负极材料领域备受关注。然而,石墨烯片层间易聚集、高长径比等缺点限制了其应用。对石墨烯进行结构设计可以显著改善上述问题。本文对近年来锂离子电池负极领域中关于结构设计石墨烯的相关文献进行了综述。结构设计石墨烯根据设计维度的不同分为三维石墨烯、多孔石墨烯、石墨烯纳米带和石墨烯量子点。简述了结构设计石墨烯的制备方法、作用机制、结构形貌以及作为锂离子电池负极的电化学性能。结构设计石墨烯在保留石墨烯本身的物理化学特性的基础上,赋予了石墨烯更丰富的三维结构、表面缺陷和边缘形态,以及更高的比表面积和导电性。这些改进促进了石墨烯对锂离子的吸附和储存,优化了锂离子扩散路径,从而提升了石墨烯材料作为锂离子电池负极的电化学性能。对于石墨烯纳米带和石墨烯量子点,通过杂原子掺杂可以更好地发挥其结构优势。 相似文献
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研究了在Si衬底上自组织生长Ge岛或Ge量子点的光致发光特性,用原子力显微镜(AFM)和透射电子显微镜(TEM)观察Ge岛的大小和密度,经过680℃退火30min,观察到了量子点的光致发光。 相似文献
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ABSTRACTIn this paper, the InAs/GaAs p-i-p quantum dots infrared photodetectors (QDIPs) were successfully demonstrated by Apsys software. It consists of Al0.3Ga0.7As/GaAs structure to reduce dark current and InAs quantum dots (QDs) embedded in In0.15Ga0.85As as an active layer. The effect of structure parameters of InAs QDs on the dark current, photocurrent of the device and SNR (signal to noise) is discussed respectively, including different QDs density, the number of QD layer, GaAs thickness between QDs layers and Al0.3Ga0.7As, and GaAs thickness between two the QD layers. 相似文献
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ABSTRACTGraphene quantum dots (GQDs) and CeO2-GQDs were synthesized by using a facile hydrothermal method at 140°C. All the synthesized materials were characterized by TEM, UV-Vis Spectroscopy, FT-IR, Raman Spectroscopy and PL. Ceria decorated GQDs show different emission peaks with different excitation of wavelengths. The discrete change in dominant luminescence features of the GQDs and their composites indicate that the variation in PL occurs because of alteration in its shape, size and bandgap. Based on the experimental results of PL peak wavelength, the emission is attributed to quasi-molecular PL from the fragments composed of a few aromatic rings with oxygen containing functional groups. 相似文献
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Eric R. Hedin Yong S. Joe Arkady M. Satanin 《Journal of Computational Electronics》2007,6(1-3):167-170
We study a four-terminal AB-ring with three embedded quantum dots in one arm. A tight-binding model is employed to analytically
obtain the transmission through the system. Results show that the magnitude and sharpness of the resonance phase-jumps diminish
as a function of the degree of coupling to the extra terminals. The Fano resonance zeros become complex with a non-zero coupling
matrix element to the extra terminals. The zeros can be returned to the real energy axis by increasing the flux for values
of the coupling less than a critical value. A simple analytical model of the Fano resonances shows naturally how the phase
transition across the resonance peak will soften and diminish in the case where the transmission zero energy is no longer
real, but complex. 相似文献
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Fabrizio Buscemi Paolo Bordone Andrea Bertoni 《Journal of Computational Electronics》2008,7(3):263-267
We address the problem of the entanglement generation in an electron-scattering by a 1D double-barrier resonant tunnelling
device. In particular we analyze the role played by transport resonances in the appearance of quantum correlations between
the energy states of the electrons. The entanglement is not sensitive to the presence of Breit-Wigner resonances, while it
may be controlled by manipulating Fano resonances. Such a behavior is ascribed to the different mechanisms characterizing
the two types of processes. 相似文献
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锂离子电池隔膜的研究进展 总被引:1,自引:0,他引:1
隔膜是锂离子电池的重要组成部分,性能优异的隔膜对提高电池的综合性能具有重要的作用。综述了锂离子电池隔膜材料的类别,并对锂离子电池隔膜材料的制备方法进行了介绍,展望了锂离子电池隔膜材料的发展趋势。 相似文献
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在300℃下、空气气氛中还原氧化石墨(GO),制得石墨烯(GN),并与二氧化锰(MnO_2)复合,在异丙醇溶液中制备GN/MnO_2复合材料。通过XRD、场发射扫描电子显微镜和高分辨拉曼光谱等方法,对产物进行分析。热还原制备的GN为薄的片层状结构;复合材料中,线状MnO_2在片层状GN表面生长。用循环伏安和恒流充放电测试产物的电化学性能。在1 mol/L Na_2SO_4电解液中,当电流为100 mA/g、电位为0~0.8 V时,GN和MnO_2的比电容分别为108 F/g和119 F/g,复合材料的比电容为181 F/g。 相似文献
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TiO2一维纳米材料(如纳米棒)的制备与应用在近些年得到快速发展,特别是TiO2纳米棒阵列作为光阳极在染料敏化太阳电池中的应用备受科研工作者的关注。本文就近些年来TiO2纳米棒阵列制备方法的研究情况做一总结和归纳,主要有模板法、超声法、水热法、金属有机化学气相沉积法及直接氧化法,并分别对不同实验方法合成的TiO2形貌及结构进行分析讨论,指出每种方法具有的优势和存在的问题,为探索简单、方便,产物形貌结构可控性强的实验方法提供依据。 相似文献