応用物理
Online ISSN : 2188-2290
Print ISSN : 0369-8009
ISSN-L : 0369-8009
ゲルマニウム単結晶の成長過程
中島 壮夫池亀 護
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ジャーナル フリー

1960 年 29 巻 6 号 p. 420-426

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The growth process of germanium single crystals from melt by Czochralski method is studied under various conditions.
As to the external shape of the crystal, if the rate of growth perpendicular to the pulling-up direction is fairly fast, it is regular hexagonal, square and hexagonal when grown in ‹111›, ‹100› and ‹110› directions respectively, but if the rate is slow, it is circular regardless of the direction of growth.
Supercooling of the melt and anisotropy of radial growth rate influence the shape of the crystal at early stage of the growth, the anisotropy seemingly depending on the degree of supercooling.
Ratios between growth rates of the main faces in highly supercooled state of the melt have been determined as
V{111}‹111›: V{110}‹110›: V{100}‹100›=1/√:1/√2:1
The crystal grows with the plane of highest atomic packing, the {111} plane, as its front in accord with Bravis' rule. The observed crystal surface perpendicular to the pulling-up direction, therefore, is bounded by {111} planes belonging to various systems and should have a certain characteristic appearance, for instance hexagon or square.

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