Cd および Zn 徴結晶の VLS 成長機構

概要

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Cd and Zn fine crystals were grown by VLS mechanism in a binary system such as Cd-Bi, Cd-Sn and Zn-Sn. The nucleation of them was homogeneous nucleation, which was explained by our consideration. Morphology of these crystals was pencil-shaped at a low temperature but was polyhedral at a high temperature. VLS whiskers also grew at a high temperature. The transition temperature was different between these systems. The liquid shape for VLS growth on the tip of a crystal changed from hemispherical (low-temperature type) to thin filmy (high-temperature type). At the same time, faceted to non-faceted transition occurred at the interface between the liquid and the crystal, which was explained by our roughening transition theory. The growth rate of the crystals increased with in-creasing growth temperature, but was almost independent of the temperature of the vapor source, which was explained by our hert transport theory. The VLS growth was ceased by incorporating the impurity such as Bi and Sn into the crystals. Both low- and high-temperature type morphologies changed to hexagonal prism by VS growth after the cessation of VLS growth. The surfaces of the crystals were smooth or striated (step surface), which depended on the binary systems. When these crystals were grown in helium atmosphere, cavities appeared on the smooth surface, but did not on the striated surface.
日本結晶成長学会の論文
1994-03-25