摘要:
A nitride single crystal is produced on a seed crystal substrate 5 in a melt containing a flux and a raw material of the single crystal in a growing vessel 1. The melt 2 in the growing vessel 1 has temperature gradient in a horizontal direction. In growing a nitride single crystal by flux method, adhesion of inferior crystals onto the single crystal is prevented and the film thickness of the single crystal is made constant.
摘要:
A nitride single crystal is produced on a seed crystal substrate 5 in a melt containing a flux and a raw material of the single crystal in a growing vessel 1. The melt 2 in the growing vessel 1 has temperature gradient in a horizontal direction. In growing a nitride single crystal by flux method, adhesion of inferior crystals onto the single crystal is prevented and the film thickness of the single crystal is made constant.
摘要:
A seed crystal is immersed in a melt containing a flux and a single crystal material in a growth vessel to produce a nitride single crystal on the seed crystal. A difference (TS-TB) of temperatures at a gas-liquid interface of the melt (TS) and at the lowermost part of the melt (TB) is set to 1° C. or larger and 8° C. or lower. Preferably, the substrate of seed crystal is vertically placed.
摘要:
A seed crystal 9 is immersed in a melt 10 containing a flux and a single crystal material in a growth vessel 7 to produce a nitride single crystal 8 on the seed crystal 9. A difference (TS−TB) of temperatures at a gas-liquid interface of the melt (TS) and at the lowermost part of the melt (TB) is set to 1° C. or larger and 8° C. or lower. Preferably, the substrate of seed crystal is vertically placed.
摘要:
It is provided a method for gently and safely recovering only sodium metal from a flux containing sodium metal in a short time and in a reusable form. Flux 23 is heated in a medium 19 unreactive with sodium metal 22 at a temperature equal to or higher than the melting point of sodium metal to separate and recover the sodium metal 22 from the flux 23. The medium is a hydrocarbon, for example.
摘要:
It is used a substrate main body 1 having a side face 1b and a pair of main faces 1a and an underlying film 2 of a single crystal of a nitride of a metal belonging to the group III formed at least on one main face of the substrate main body 1. A single crystal 3 of a nitride of a metal belonging to the group III is grown on the main face 1a of the substrate main body 1 by a liquid phase process. The underlying film 2 has a shape of a convex figure in a plan view. A surface 4 without the underlying film thereon surrounds the entire circumference of the underlying film 2. The single crystal 3 of a nitride of a metal belonging to the group III grown on the underlying film 2 is not brought into contact with a single crystal of a nitride of a metal belonging to group III formed on another underlying film.
摘要:
It is used a substrate main body 1 having a side face 1b and a pair of main faces 1a and an underlying film 2 of a single crystal of a nitride of a metal belonging to the group III formed at least on one main face of the substrate main body 1. A single crystal 3 of a nitride of a metal belonging to the group III is grown on the main face 1a of the substrate main body 1 by a liquid phase process. The underlying film 2 has a shape of a convex figure in a plan view. A surface 4 without the underlying film thereon surrounds the entire circumference of the underlying film 2 The single crystal 3 of a nitride of a metal belonging to the group III grown on the underlying film 2 is not brought into contact with a single crystal of a nitride of a metal belonging to group III formed on another underlying film.
摘要:
It is provided a method for gently and safely recovering only sodium metal from a flux containing sodium metal in a short time and in a reusable form. Flux 23 is heated in a medium 19 unreactive with sodium metal 22 at a temperature equal to or higher than the melting point of sodium metal to separate and recover the sodium metal 22 from the flux 23. The medium is a hydrocarbon, for example.
摘要:
Provided is an epitaxial substrate using a silicon substrate as a base substrate. An epitaxial substrate, in which a group of group-III nitride layers are formed on a (111) single crystal Si substrate such that a (0001) crystal plane of the group of group-III nitride layers is substantially in parallel with a surface of the substrate, includes: a first group-III nitride layer made of AlN with many defects configured of at least one kind from a columnar or granular crystal or domain; a second group-III nitride layer whose interface with the first group-III nitride layer is shaped into a three-dimensional concave-convex surface; and a third group-III nitride layer epitaxially formed on the second group-III nitride layer as a graded composition layer in which the proportion of existence of Al is smaller in a portion closer to a fourth group-III nitride.
摘要:
An epitaxial substrate, in which a group of group-III nitride layers is formed on a single-crystal silicon substrate so that a crystal plane is approximately parallel to a substrate surface, comprises: a first group-III nitride layer formed of AlN on the base substrate; a second group-III nitride layer formed of InxxAlyyGazzN (xx+yy+zz=1, 0≦xx≦1, 0