摘要:
On a substrate made of e.g., sapphire single crystal is formed an Al underlayer having FWHM X-ray rocking curve value of 90 seconds or below. A buffer layer is formed on the AlN underlayer and has a composition of AlpGaqIn1−p−qN (0≦p≦1, 0≦y≦q). A GaN-based semiconductor layer group is formed on the buffer layer.
摘要翻译:在由例如蓝宝石单晶制成的基板上形成FWHM X射线摇摆曲线值为90秒以下的Al底层。 在AlN底层上形成缓冲层,并且具有下列组成:在1-pq N(0 <= p < = 1,0 <= y <= q)。 在缓冲层上形成GaN基半导体层组。
摘要:
A method for fabricating a Group III nitride film is provided, including the steps of preparing a substrate, forming an underfilm and then forming the Group III nitride film on the underfilm. The underfilm is a Group III nitride including at least 50 atomic percent of elemental Al for each of the Group III elements of the underfilm Group III nitride. The surface of the underfilm includes a contoured portion and a flat region, and less than 50% of the surface is occupied by the flat region.
摘要:
In fabricating a semiconducting nitride film by a MOCVD method, a susceptor tray is employed. The susceptor tray is constructed of a base plate and an outer member detachable from the base plate. A substrate for the film to be formed upon is set in a recessed portion formed by disposing the outer member on the base plate.
摘要:
A method for fabricating a Group III nitride film is provided, including the steps of preparing a substrate, forming an underfilm and then forming the Group III nitride film on the underfilm. The underfilm is a Group III nitride comprising at least one Group III element and includes at least 50 atomic percent of elemental Al with respect to all of the Group III elements of the Group III nitride of the underfilm. The surface of the underfilm is contoured (concave-convex) and includes flat regions, and less than 50% of the underfilm surface is occupied by the flat regions.
摘要:
The crystal orientation of the main surface of a sapphire single crystal base material to constitute an epitaxial substrate is inclined from the orientation (c-axis) preferably for the orientation (m-axis) by a range within 0.02-0.3 degrees. Then, a surface nitride layer is formed at the main surface of the base material. Then, a III nitride underfilm is formed on the main surface of the base material via the surface nitride layer. The III nitride underfilm includes at least Al element, and the full width at half maximum at (101-2) reflection in X-ray rocking curve of the III nitride underfilm is 2000 seconds. The surface roughness Ra within 5 μm area is 3.5 Å.
摘要:
A lower region having a composition of Alx1Gax2Inx3N (x1+x2+x3=1, 0.5≦x1≦1.0) is formed through epitaxial growth by a CVD method, and subsequently, an upper region having a composition of Aly1Gay2Iny3N (y1+y2+y3=1, 0≦y1≦x1−0.1) is formed through epitaxial growth by a CVD method. A boundary face divides a given III nitride film into the lower region and the upper region and the lower and upper regions have an Al content difference of 10 atomic percent or more.
摘要:
A semiconductor element includes a conductive SiC base having a resistivity of less than 1×105 &OHgr;cm, an underlayer made of a semiconductor nitride including at least Al element which is formed on the SiC base, and a semiconductor nitride layer group made including at least one of Al element, Ga element and In element.
摘要:
A hydrogen chloride gas and an ammonia gas are introduced with a carrier gas into a reactor in which a substrate and at least an aluminum metallic material through conduits. Then, the hydrogen gas and the ammonia gas are heated by heaters, and thus, a III-V nitride film including at least Al element is epitaxially grown on the substrate by using a Hydride Vapor Phase Epitaxy method. The whole of the reactor is made of an aluminum nitride material which does not suffer from the corrosion of an aluminum chloride gas generated by the reaction of an aluminum metallic material with a hydrogen chloride gas.
摘要:
A III nitride semiconductor substrate for ELO is provided for forming a III nitride film whose surface is controlled independent of the film's thickness. A III nitride underlayer including at least Al is directly formed on a base made of e.g. a sapphire single crystal, and not formed through a buffer layer formed at a low temperature. After that patterns made of e.g SiO2 are formed on the underlayer.
摘要:
Plural island-shaped crystal portions are formed on a first Al-including nitride base. The island-shaped crystal portions are made of a second nitride, and have a nitride film including a third nitride epitaxially grown thereon. The island-shaped crystal portions function as nuclei during the growth of the third nitride-including film.