In ultraviolet-photoelectron spectroscopy on a Si(100) surface during solid-source or gas-source molecular-beam epitaxy (MBE), intensity oscillations of photoelectrons from the valence-band surface states are observed. Recent studies by authors [Enta et al., Surf. Sci. 313, L797 (1994)] have revealed that the photoelectron intensity oscillations (PIOs) most probably originate from an alternation between the 2×1 and the 1×2 surface reconstructions during growth. This model consequently suggests that the period of the oscillations corresponds to the growth time of 2 ML. To confirm this relation, reflection high-energy electron diffraction (RHEED) intensity oscillation was measured during gas-source MBE, using Si2H6 under identical growth conditions with those used for PIO observations. The oscillation period at the half-order diffraction spots of RHEED agreed well with that of PIO at various Si2H6 pressures, providing a direct support for the above interpretation for the origin of PIO.
|ジャーナル||Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films|
|出版ステータス||Published - 1997|
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