Abstract: An ultraviolet light emitting semiconductor chip, its use in a LED, and methods of its fabrication are disclosed. The semiconductor chip can include a buffer layer of AlxGa1-xN, where 0<x?1 having a thickness from about 10 ?m to about 3 mm and defining apertures in the thickness of the buffer layer formed due to lateral overgrowth of the buffer layer over a grooved basal substrate. A n-junction LED layer overlying the buffer layer, a multiple quantum well LED layer overlying the n-junction LED layer, and a p-junction LED layer overlying the multiple quantum well LED layer are also included in the chip, where all of the LED layers comprise AlxGa1-xN, where 0<x?1.

Abstract: Fabrication methods of a high frequency (sub-micron gate length) operation of AlInGaN/InGaN/GaN MOS-DHFET, and the HFET device resulting from the fabrication methods, are generally disclosed. The method of forming the HFET device generally includes a novel double-recess etching and a pulsed deposition of an ultra-thin, high-quality silicon dioxide layer as the active gate-insulator. The methods of the present invention can be utilized to form any suitable field effect transistor (FET), and are particular suited for forming high electron mobility transistors (HEMT).

Abstract: An ultraviolet light emitting semiconductor chip, its use in a LED, and methods of its fabrication are disclosed. The semiconductor chip can include a buffer layer of AlxGa1-xN, where 0<x?1 having a thickness from about 10 ?m to about 3 mm and defining apertures in the thickness of the buffer layer formed due to lateral overgrowth of the buffer layer over a grooved basal substrate. A n-junction LED layer overlying the buffer layer, a multiple quantum well LED layer overlying the n-junction LED layer, and a p-junction LED layer overlying the multiple quantum well LED layer are also included in the chip, where all of the LED layers comprise AlxGa1-xN, where 0<x?1.

Abstract: An ultraviolet light emitting semiconductor chip, its use in a LED, and methods of its fabrication are disclosed. The semiconductor chip can include a buffer layer of AlxGa1-xN, where 0<x?1 having a thickness from about 10 ?m to about 3 mm and defining apertures in the thickness of the buffer layer formed due to lateral overgrowth of the buffer layer over a grooved basal substrate. A n-junction LED layer overlying the buffer layer, a multiple quantum well LED layer overlying the n-junction LED layer, and a p-junction LED layer overlying the multiple quantum well LED layer are also included in the chip, where all of the LED layers comprise AlxGa1-xN, where 0<x?1.

Abstract: Methods of achieving high breakdown voltages in semiconductor devices by suppressing the surface flashover using high dielectric strength insulating encapsulation material are generally described. In one embodiment of the present invention, surface flashover in AlGaN/GaN heterostructure field-effect transistors (HFETs) is suppressed by using high dielectric strength insulating encapsulation material. Surface flashover in as-fabricated III-Nitride based HFETs limits the operating voltages at levels well below the breakdown voltages of GaN.

Abstract: Fabrication methods of a high frequency (sub-micron gate length) operation of AlInGaN/InGaN/GaN MOS-DHFET, and the HFET device resulting from the fabrication methods, are generally disclosed. The method of forming the HFET device generally includes a novel double-recess etching and a pulsed deposition of an ultra-thin, high-quality silicon dioxide layer as the active gate-insulator. The methods of the present invention can be utilized to form any suitable field effect transistor (FET), and are particular suited for forming high electron mobility transistors (HEMT).

Abstract: Fabrication methods of a high frequency (sub-micron gate length) operation of AlInGaN/InGaN/GaN MOS-DHFET, and the HFET device resulting from the fabrication methods, are generally disclosed. The method of forming the HFET device generally includes a novel double-recess etching and a pulsed deposition of an ultra-thin, high-quality silicon dioxide layer as the active gate-insulator. The methods of the present invention can be utilized to form any suitable field effect transistor (FET), and are particular suited for forming high electron mobility transistors (HEMT).

Abstract: An epitaxy procedure for growing extremely low defect density non-polar and semi-polar III-nitride layers over a base layer, and the resulting structures, is generally described. In particular, a pulsed selective area lateral overgrowth of a group III nitride layer can be achieved on a non-polar and semi-polar base layer. By utilizing the novel P-MOCVD or PALE and lateral over growth over selected area, very high lateral growth conditions can be achieved at relatively lower growth temperature which does not affect the III-N surfaces.

Abstract: Methods of achieving high breakdown voltages in semiconductor devices by suppressing the surface flashover using high dielectric strength insulating encapsulation material are generally described. In one embodiment of the present invention, surface flashover in AlGaN/GaN heterostructure field-effect transistors (HFETs) is suppressed by using high dielectric strength insulating encapsulation material. Surface flashover in as-fabricated III-Nitride based HFETs limits the operating voltages at levels well below the breakdown voltages of GaN.

Abstract: An epitaxy procedure for growing extremely low defect density non-polar and semi-polar III-nitride layers over a base layer, and the resulting structures, is generally described. In particular, a pulsed selective area lateral overgrowth of a group III nitride layer can be achieved on a non-polar and semi-polar base layer. By utilizing the novel P-MOCVD or PALE and lateral over growth over selected area, very high lateral growth conditions can be achieved at relatively lower growth temperature which does not affect the III-N surfaces.

Abstract: Fabrication methods of a high frequency (sub-micron gate length) operation of AlInGaN/InGaN/GaN MOS-DHFET, and the HFET device resulting from the fabrication methods, are generally disclosed. The method of forming the HFET device generally includes a novel double-recess etching and a pulsed deposition of an ultra-thin, high-quality silicon dioxide layer as the active gate-insulator. The methods of the present invention can be utilized to form any suitable field effect transistor (FET), and are particular suited for forming high electron mobility transistors (HEMT).

Abstract: An ultraviolet light emitting semiconductor chip, its use in a LED, and methods of its fabrication are disclosed. The semiconductor chip can include a buffer layer of AlxGa1-xN, where 0<×?1 having a thickness from about 10 ?m to about 3 mm and defining apertures in the thickness of the buffer layer formed due to lateral overgrowth of the buffer layer over a grooved basal substrate. A n-junction LED layer overlying the buffer layer, a multiple quantum well LED layer overlying the n-junction LED layer, and a p-junction LED layer overlying the multiple quantum well LED layer are also included in the chip, where all of the LED layers comprise AlxGa1-xN, where 0<×?1.

Abstract: Methods of achieving high breakdown voltages in semiconductor devices by suppressing the surface flashover using high dielectric strength insulating encapsulation material are generally described. In one embodiment of the present invention, surface flashover in AlGaN/GaN heterostructure field-effect transistors (HFETs) is suppressed by using high dielectric strength insulating encapsulation material. Surface flashover in as-fabricated III-Nitride based HFETs limits the operating voltages at levels well below the breakdown voltages of GaN.

Abstract: A high efficiency UV responsive negative electron affinity photocathode with the long wavelength cutoff tunable over the wavelength from .about.200 to .about.300 nm based on Al.sub.x Ga.sub.1-x N. Negative electron affinity photocathodes for sharply enhanced photoemission yield can be formed by applying a layer of cesium to the surface of Al.sub.x Ga.sub.1-x N for which the Fermi energy level is appropriately positioned.

Abstract: A method of preparing a UV detector of Al.sub.x Ga.sub.1-x N. Metal organic chemical vapor deposition (MOCVD) is utilized to grow AlN and then Al.sub.x Ga.sub.1-x N on a sapphire substrate. A photodetector structure is fabricated on the AlGaN.