Abstract
Using a density-functional approach, we study the effective density of states and the effective masses of Si(0 0 1)/SiO2 superlattices. We apply four models of the Si/SiO2 interface and vary the Si layer thickness. The role of the confinement and the interface geometry on the effective density of states and effective masses is discussed in detail. Averages over the k-space in three and one dimensions are compared. The critical influence of the SiO2 barriers on the transport of electrons and holes is investigated.
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