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用AES详细观测了化学生成Si/S_1O_2系统在超高真空(UHV)中的退火变化.并对收录的俄歇直接谱进行了快速傅里叶变换(FET)退自卷积处理,得到了Si态密度退火前后的变化情况.最后,对退火效应进行了分析和讨论. 相似文献
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最近,电子态在量子阱垒上方的局域和束缚已为实验证实,这是电子的波动性和干波效应的一种直接实验证,试图介绍这种所谓“正能量”束缚态的形成机制,以引起我国学者注意。 相似文献
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我们在研究中发现,在三极管管芯铝电极上涂敷一层聚酰亚胺树脂,对提高铝电极的抗电迁移能力是明显的,而且对提高三极管的电性能稳定性也很有好处.聚酰亚胺是一种性能优越的热塑料树脂,约在:-310~340℃的温度范围内可保持良好的机械性能和电性能,而且具有耐辐射、耐氧化等优良性能.其抗拉伸强度及热变形温度都很高.铝电极表面可以看成是一个连续的晶粒边 相似文献
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Radiative transition in δ-doped GaAs superlattices with and without Al0.1Ga0.9As barriers is investigated by using photoluminescence at low temperatures. The experimental results show that the transition mechanism of δ-doped superlattices is very different from that of ordinary superlattices. Emission intensity of the transition from the electron first excited state to hole states is obviously stronger than that from the electron ground state to hole states due to larger overlap integral between wavefunctions of electrons in the first excited state and hole states. Based on the effective mass theory we have calculated the self-consistent potentials, optical transition matrix elements and photoluminescence spectra for two different samples. By using this model we can explain the main optical characteristics measured. Moreover, after taking into account the bandgap renormalization energy, good agreement between experiment and theory is obtained. 相似文献
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报道了GaAs/AlGaAs非对称耦合双量子阱pin结构在不同温度下的光荧光谱,观察到宽阱与窄阱重空穴激子峰荧光强度随温度上升而较快下降的不同变化关系,结果表明窄阱电子的热发射是导致窄阱光荧光强度随温度上升而较快下降的主要原因。同时观测到宽阱轻空穴激子峰强度特环的温度依赖关系,并分析了其物理机制。 相似文献
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