Diamond superlattices were fabricated by producing multilayer structures of isotopically pure carbon-12 (12C) and carbon-13 (13C), which confine electrons by a difference in band-gap energy. Secondary ion mass spectrometry (SIMS) measurements were employed to characterize the isotopic composition of the diamond superlattices. Layers between 2 nm and 350 nm in thickness can be designed and fabricated using a microwave plasma-assisted chemical vapor deposition technique.
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Watanabe, H., Shikata, S. Superlattices from Diamond. MRS Online Proceedings Library 1203, 1304 (2009). https://doi.org/10.1557/PROC-1203-J13-04