共查询到16条相似文献,搜索用时 171 毫秒
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采用电容耦合法,在18~300K 温度范围内测量了一系列 Ge_xSi_(1-x)/Si应变层多量子阱和 Ge/Si 超薄超晶格在不同温度下的红外光电压谱。实验结果表明,在长波段有强的光电压信号。文中还对 Ge_xSi_(1-x)/Si 量子阱和超晶格的能带排列和光伏效应作了讨论。 相似文献
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GexSi1—x/Si应变层超晶格光伏特性研究 总被引:2,自引:0,他引:2
采用电容耦合法测量了Ge_xSi_(1-x)/Si应变层超晶格在不同温度下的光伏特性.在Ⅱ型能带排列的样品中观测到价带-导带子带和价带子带-导带光跃迁的4个峰.对所有样品测得的光伏截止波长都比理论预期值小.还对光电压随温度的变化作了初步解释. 相似文献
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近年来,Ge_xSi_(1-x)/Si 应变层超晶格的研究日渐活跃与成熟。本文试从半导体物理与器件应用的角度出发,着重介绍了这种超晶格的各种结构特性,并简要评述了以 Ge_xSi_(1-x)/Si 异质结形成的各种新型半导体器件的研究进展。 相似文献
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李锋 《红外与毫米波学报》1994,13(5):340-346
研究了用分子束外延方法生长在GaAs(100)衬底上的In_xGa_(1-x)As/GaAs(x=0.1)应变多量子阱样品,观察了其光荧光谱和光调制反射谱的光谱结构,讨论了有关基态光跃迁和激发态光跃迁性质.根据实验结果给出了能带偏移比值为Q_c=0.69(Q_v=1-Q_c=0.31),并提出有关轻空穴束缚于GaAs层而形成Ⅱ类超晶格的重要佐证. 相似文献
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本文着重介绍HgCdTe、IrSi、Ce_xSi_(1-x)/p-Si和GaAs/AlGaAs多重量子阱长波红外焦平面阵列的现状及发展趋势。 相似文献
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GexSi1—xSi应变层和超晶格及其临界厚度 总被引:1,自引:0,他引:1
异质外延层的性能和质量,往往取决于异质结构的特性。文章讨论了Ge_xSi-(1-x)/Si 应变层和应变层超晶格中的应变、位错和临界厚度,并比较了实验结果。 相似文献
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D. W. Peggs M. S. Skolnick D. M. Whittaker R. A. Hogg A. R. K. Willcox D. J. Mowbray R. Grey G. J. Rees L. Hart M. Hopkinson G. Hill M. A. Pate 《Solid-state electronics》1996,40(1-8):167-170
Wannier-Stark ladder transitions in the photocurrent spectra of (111)B InxGa1−xAs---GaAs strained layer superlattices are reported. Both vertical transitions in the same well and diagonal transitions between adjacent wells are observed. In contrast to (100) superlattices, the Wannier-Stark spectra are observed for both senses of applied bias relative to zero potential drop across the superlattice. The observed transition energies are found to be in good agreement with the predictions of exciton calculations. The piezo-electric field is deduced in a simple and direct way from analysis of the spectra as a function of bias. 相似文献
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文章主要介绍 Ge_xSi_(1-x)/Si 超晶格量子阱长波红外探测器和新颖的红外焦平面阵列的现状。 相似文献
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介绍了应变层Ge_xSi_(1-x)/Si异质结构的生长、材料特性及其在异质结双极晶体管(HBT)、双极反型沟道场效应晶体管(BICFET)、调制掺杂场效应晶体管(MODFET)、谐振隧道二极管、负阻效应晶体管(NERFET)、毫米波混合隧道雪崩渡越时间(MITATT)二极管和光电探测器等器件中的应用状况,并指出了其发展前景。 相似文献
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Defects such as dislocations and interfaces play a crucial role in the performance of heterostructure devices. The full potential
of GaAs on Si heterostructures can only be realized by controlling the defect density. The reduction of threading dislocations
by the use of strained layer superlattices has been studied in these heterostructures. Several superlattice structures have
been used to reduce the density of threading dislocations in the GaAs epilayer. In this study, we have optimized the use of
strained layer superlattices with respect to the position, period and number to reduce and control the dislocation density.
The use of strained layer superlattices in conjunction with rapid thermal annealing was found to be a most effective method
for reducing the threading dislocation density. Transmission electron microscopy has been used to study the dislocation density
reduction and the interaction of threading dislocations with the strained layers. A model has been developed based on energy
considerations to determine the critical thickness required for the bending of threading dislocations. 相似文献