Research of "vacancy epitaxy"

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(1) I tried to grow Ga vacancy-ordered Ga_2Se_3 epitaxial films on Si (100) substrates. In order to obtain a single-domain epitaxial film I used a vicinal Si (001) substrare, whose clean surface has the 2×1 single-domain reconstruction. In addition, the lattice constant of the Si is almost same with that of Ga_2Se_3. It has been found that Ga vacancy-ordered single-domain Ga_2Se_3 films can be grown on the vicinal Si (001) substrates with the growth condisions ; substrate temperature = 480℃, VI/III ratio > 100. At the substrate temperature higher than 500℃, no Ga vacancy ordering was observed. At lower substrate temperature than 420 ℃, polycrystalline growth occurred. At the VI/III ratio of 10, no Ga vacancy-ordering was found, too. Photoluminescence spectra taken at 6.5K showed very btoad luminescence peak around 650 〜 1000 nm. No polarized photoluminescence was observed from the Ga vacancy-ordered Ga2Se3 film, which suggests that the grown film on the vicinal Si (001) substrate has the monoclinic crystal structure.