Abstract:
The present disclosure provides a laminated structure suitable for semiconductor elements. The laminated structure includes a first oxide layer having a trench structure on its surface and a second oxide layer laminated along the trench structure. A difference in thickness between centers of a bottom and a sidewall of the second oxide layer is less than 30%.
Abstract:
Methods of forming high voltage (111) silicon nano-structures are described. Those methods and structures may include forming a III-V device layer on (111) surface of a silicon fin structure, forming a 2DEG inducing polarization layer on the III-V device layer, forming a source/drain material on a portion of the III-V device layer on terminal ends of the silicon fin. A middle portion of the silicon fin structure between the source and drain regions may be removed, and backfilled with a dielectric material, and then a gate dielectric and a gate material may be formed on the III-V device layer.
Abstract:
The invention relates to a method for the production of a light-emitting diode, characterised in that the method comprises a step of preparing a light-emitting layer (20) on a front face of a support (10), said emitting layer comprising at least two adjacent quantum wells (21, 22, 23) emitting at different wavelengths, said quantum wells (21, 22, 23) being in contact with the front face of the support. According to the invention, the step in which the light-emitting layer is deposited comprises a sub-step consisting in locally varying the temperature of a rear face of the support opposite the front face such that the front face of the support comprises at least two zones at different temperatures.
Abstract:
A light emitting device and method for making the same is disclosed. The light-emitting device includes an active layer sandwiched between a p-type semiconductor layer and an n-type semiconductor layer. The active layer emits lights when holes from the p-type semiconductor layer combine with electrons from the n-type semiconductor layer therein. The active layer includes a number of sub-layers and has a plurality of pits in which the side surfaces of a plurality of the sub-layers are in contact with the p-type semiconductor material such that holes from the p-type semiconductor material are injected into those sub-layers through the exposed side surfaces without passing through another sub-layer. The pits can be formed by utilizing dislocations in the n-type semiconductor layer and etching the active layer using an etching atmosphere in the same chamber used to deposit the semiconductor layers without removing the partially fabricated device.
Abstract:
Provided is an epitaxial substrate in which a silicon substrate is used as a base substrate, that allows a HEMT device with a high breakdown voltage to be achieved. 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 that is made of AlN and that is a layer 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; a third group-III nitride layer that is epitaxially formed on the second group-III nitride layer; and the third group-III nitride layer that is a graded composition layer in which the proportion of existence of Al is smaller in a portion closer to a fourth group-III nitride.
Abstract:
Provided is a crack-free epitaxial substrate having excellent breakdown voltage properties in which a silicon substrate is used as a base substrate thereof. An epitaxial substrate in which a group of group-III nitride layers are formed on a base substrate made of (111)-oriented single crystal silicon such that a (0001) crystal plane of the group of group-III nitride layers is substantially in parallel with a substrate surface of the base substrate includes: a buffer layer including a composition modulation layer that is formed of a first composition layer made of AlN and a second composition layer made of Al x Ga 1-x N (0‰¤x x(n) is satisfied, where n represents the number of laminations of each of the first composition layer and the second composition layer (n is a natural number equal to or greater than two), and x(i) represents the value of x in i-th one of the second composition layers as counted from the base substrate side, to thereby cause a compressive strain to exist such that the compressive strain increases in a portion more distant from the base substrate.
Abstract:
A semiconductor epitaxial substrate includes: a single crystal substrate; an AlN layer epitaxially grown on the single crystal substrate; and a nitride semiconductor layer epitaxially grown on the AlN layer, wherein an interface between the AlN layer and nitride semiconductor layer has a larger roughness than an interface between the single crystal substrate and AlN layer, and a skewness of the upper surface of the AlN layer is positive.
Abstract:
A method for manufacturing a gallium nitride (GaN) wafer is provided. In the method for manufacturing the GaN wafer according to an embodiment, an etch stop layer is formed on a substrate, and a first GaN layer is formed on the etch stop layer. A portion of the first GaN layer is etched with a silane gas, and a second GaN layer is formed on the etched first GaN layer. A third GaN layer is formed on the second GaN layer.