期刊
PHYSICAL REVIEW LETTERS
卷 86, 期 11, 页码 2381-2384出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.2381
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We report first quantitative measurements by energy-selected imaging in a transmission electron microscope of In segregation within an uncapped islanded In0.25Ga0.75As layer grown epitaxially on GaAs. This layer has the lowest In concentration at which islanding occurs and, then, only after a flat similar to3 nm alloy layer has been formed. In buildup by segregation at the surface of this initial flat layer is considered the driving force for islanding and, importantly, the segregation process introduces the characteristic delay seen before the Stranski-Krastanow transition. We observe strong inhomogeneous In enrichment within the islands (up to x(In) approximate to 0.6 at the apex) and a simultaneous In depletion in the remaining flat layer.
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