Atom probe microscopy of three-dimensional distribution of silicon isotopes in Si28∕Si30 isotope superlattices with sub-nanometer spatial resolution

作者: Yasuo Shimizu , Yoko Kawamura , Masashi Uematsu , Kohei M Itoh , Mitsuhiro Tomita

DOI: 10.1063/1.3236673

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摘要: Laser-assisted atom probe microscopy of 2 nm period Si28∕Si30 isotope superlattices (SLs) is reported. Three-dimensional distributions Si28 and Si30 stable isotopes are obtained with sub-nanometer spatial resolution. The depth resolution the present analysis much higher than that secondary ion mass spectrometry (SIMS) even when SIMS performed a great care to reduce artifact due atomic mixing. Outlook Si SLs as ideal scales for three-dimensional position standards discussed.

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