A method of fabricating an ultraviolet (UV) light emitting device includes receiving a UV transmissive substrate, forming a first UV transmissive layer comprising aluminum nitride upon the UV transmissive substrate using a first deposition technique at a temperature less than about 800 degrees Celsius or greater than about 1200 degrees Celsius, forming a second UV transmissive layer comprising aluminum nitride upon the first UV transmissive layer comprising aluminum nitride using a second deposition technique that is different from the first deposition technique, at a temperature within a range of about 800 degrees Celsius to about 1200 degrees Celsius, forming an n-type layer comprising aluminum gallium nitride layer upon the second UV transmissive layer, forming one or more quantum well structures comprising aluminum gallium nitride upon the n-type layer, and forming a p-type nitride layer upon the one or more quantum well structures.

A method of making a GaN device includes: forming a GaN substrate; forming a plurality of spaced-apart first metal contacts directly on the GaN substrate; forming a layer of insulating GaN on the exposed portions of the upper surface; forming a stressor layer on the contacts and the layer of insulating GaN; forming a handle substrate on the first surface of the stressor layer; spalling the GaN substrate that is located beneath the stressor layer to separate a layer of GaN and removing the handle substrate; bonding the stressor layer to a thermally conductive substrate; forming a plurality of vertical channels through the GaN to define a plurality of device structures; removing the exposed portions of the layer of insulating GaN to electrically isolate the device structures; forming an ohmic contact layer on the second surface; and forming second metal contacts on the ohmic contact layer.

A method for fabricating a light emitting device, comprising: forming a plurality of light emitting stacked layers above a substrate; forming and patterning a current blocking (CB) layer on the light emitting stacked layers; forming a transparent conductive layer covering the light emitting stacked layers and the current blocking layer; etching the transparent conductive layer and exposing a reserved region for a first pad electrode and a mesa structure, respectively; and etching an exposed portion of the light emitting stacked layers and a portion of the current blocking layer to form a remaining current blocking layer, the mesa structure and a first opening.

Light emitting diodes (LEDs) with N-polarity and associated methods of manufacturing are disclosed herein. In one embodiment, a method for forming a light emitting diode on a substrate having a substrate material includes forming a nitrogen-rich environment at least proximate a surface of the substrate without forming a nitrodizing product of the substrate material on the surface of the substrate. The method also includes forming an LED structure with a nitrogen polarity on the surface of the substrate with a nitrogen-rich environment.

In a method according to embodiments of the invention, a III-nitride layer is grown on a growth substrate. The III-nitride layer is connected to a host substrate. The growth substrate is removed. The growth substrate is a non-III-nitride material. The growth substrate has an in-plane lattice constant a.sub.substrate. The III-nitride layer has a bulk lattice constant a.sub.layer. In some embodiments, [(|a.sub.substratea.sub.layer|)/a.sub.substrate]*100% is no more than 1%.

A light emitting diode device has a bulk gallium and nitrogen containing substrate with an active region. The device has a lateral dimension and a thick vertical dimension such that the geometric aspect ratio forms a volumetric diode that delivers a nearly uniform current density across the range of the lateral dimension.

Provided is a vertical type light emitting device and a method of manufacturing the same. A transparent electrode having high transmittance with respect to light in the entire range and constructed by using a resistance change material of which resistance state is to be changed from a high resistance state to a low resistance state if a voltage exceeding a threshold voltage inherent in a material is applied so that conducting filaments are formed is formed between an electrode pad and a semiconductor layer of a light emitting device. The transparent electrode has high transmittance with respect to the light in a UV wavelength range as well as in a visible wavelength range generated in the light emitting device. Since the conductivity of the transparent electrode is heightened due to the formation of the conducting filaments, the transparent electrode has good ohmic contact characteristic with respect to a semiconductor layer.

Provided is a self-supporting polycrystalline GaN substrate composed of GaN-based single crystal grains having a specific crystal orientation in a direction approximately normal to the substrate. The crystal orientations of individual GaN-based single crystal grains as determined from inverse pole figure mapping by EBSD analysis on the substrate surface are distributed with tilt angles from the specific crystal orientation, the average tilt angle being 1 to 10. There is also provided a light emitting device including the self-supporting substrate and a light emitting functional layer, which has at least one layer composed of semiconductor single crystal grains, the at least one layer having a single crystal structure in the direction approximately normal to the substrate. The present invention makes it possible to provide a self-supporting polycrystalline GaN substrate having a reduced defect density at the substrate surface, and to provide a light emitting device having a high luminous efficiency.

A semiconductor device is disclosed, and the semiconductor device comprises: a semiconductor layer; and a transparent electrode which is formed from a resistance switching material and is formed on one side of the semiconductor layer, wherein the transparent electrode includes a channel on which an electron is capable of hopping and a conductive path formed by applying a voltage that is a threshold voltage or more, and the threshold voltage for forming the conductive path is lowered by the channel.

A light emitting diode chip including a substrate and a light emitting diode element layer is provided. The substrate has a growth surface and a plurality of microstructures on the growth surface. An area of the growth surface occupied by the microstructures is A1 and an area of the growth surface not occupied by the microstructures is A2, such that A1 and A2 satisfy the relation of 0.1A2/(A1+A2)0.5. The light emitting diode element layer is disposed on the growth surface of the substrate.