991 resultados para 100 kyr tuning
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于2010-11-23批量导入
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于2010-11-23批量导入
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国家自然科学基金
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用XPS和UPS研究了氧在Rb复盖的和清洁的InP(100)表面的吸附行为。实验结果表明,碱金属可以使衬底的氧化能力大大增加。在氧的暴露量低于1L时,氧主要吸附在碱金属原子之间的InP衬底上,且位于Rb原子层之下。当氧暴露量增加时,氧主要还是吸附在Rb覆盖层下面,这时衬底开始氧化。在清洁表面,氧主要吸附在In原子上,样品退火后,Rb部分脱附,同时,衬底的氧化物相(InPO_4)含量增加。
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于2010-11-23批量导入
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利用同步辐射光电子能谱研究了室温下Na吸附下于P型InP(100)表面对其氮化反应的影响,通过P2p、In 4d芯能级谱的变化,对Na/InP(100)表面的氮化反应的研究表明,碱金属Na的吸附对InP(100)无明显的催化氮化作用,即使采用N_2/Na/N_2/Na/N_2/Na/InP(100)的类多层结构,在室温下也只有极少量的氮化物形成,而无明显的催化氮化反应发生.碱金属吸附层对III-V族半导体氮化反应的催化机制不同于碱金属对于元素半导体的催化反应机制,碱金属对元素半导体的催化氮化反应,吸附的碱金属与元素半导体衬底之间无需界面反应发生,而碱金属吸附层和III-V族半导体衬底之间发生界面反应而形成的表面缺陷在III-V族半导体的催化氮化反应过程中具有重要的作用.
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于2010-11-23批量导入
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于2010-11-23批量导入
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于2010-11-23批量导入
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国家教委基金
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Low power design method is used in a 100MHz embedded SRAM. The embedded SRAM used in a FFT chip is divided into 16 blocks. Two-level decoders are used and only one block can be selected at one time by tristate control circuits, while other blocks are set stand-by. The SRAM cell has been optimized and the cell area has been minimized at the same time.
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The effect of thermal annealing on the Raman spectrum of Si0.33Ge0.67 alloy grown on Si (100) by molecular beam epitaxy is investigated in the temperature range of 550-800 degrees C. For annealing below 700 degrees C, interdiffusion at the interface is negligible and the residual strain plays the dominant role in the Raman shift. The strain-shift coefficients for Si-Ge and Ge-Ge phonon modes are determined to be 915 +/- 215 cm(-1) and 732 +/- 117 cm(-1), respectively. For higher temperature annealing, interdiffusion is significant and strongly affects the Raman shift and the spectral shape.