Superlattice structures from diamond

Diamond superlattices were fabricated by producing multilayer structures of isotopically pure carbon-12 (C-12) and carbon-13 (C-13), which confine charge carriers through a difference in band-gap energy. C-12/C-13 homojunctions of a diamond layer in which isotopic composition modulation occurred were grown via a microwave plasma-assisted chemical vapor deposition on diamond substrates. Secondary ion mass spectrometry (SIMS) and imaging measurements were employed to characterize the isotopic composition of the diamond superlattices. Layers between 2 and 30 nm thick were designed and fabricated. (C) 2011 Elsevier RV. All rights reserved.