Epitaxial GexSi1-x/Si (100) structures produced by pulsed laser mixing of evaporated Ge on Si (100) substrates

Abelson, John R.; Sigmon, Thomas W.; Kim, Ki Bum; Weiner, Kurt H.
January 1988
Applied Physics Letters;1/18/1988, Vol. 52 Issue 3, p230
Academic Journal
Heteroepitaxial GexSi1-x alloy layers have been formed by pulsed laser induced mixing of pure germanium films and Si (100) substrates. Ge films 50–200 Å thick are electron beam evaporated onto Si (100) under ≤1×10-7 Torr vacuum. The near surface of the sample then undergoes a rapid melt and regrowth process using 2–10 pulses from a XeCl excimer laser. The laser has a 37-ns pulse width at 308 nm and its energy density of 0.5–1.5 J/cm2 is precisely homogenized into a 4×4 mm square area. The alloy layers are 250–1600 Å thick, have a Ge fraction x=2.5–19%, and exhibit excellent crystallinity as evaluated by MeV ion channeling and lattice resolution cross-sectional transmission electron microscopy. Unlike layer growth by molecular beam epitaxy, this approach is insensitive to minor levels of contamination because the original Ge/Si interface is melted through during the laser processing.


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