Abstract:
A semiconductor laser device includes, in a disclosed embodiment: a semiconductor active region disposed between upper and lower confining regions of opposite type semiconductor material; reflective facets at opposing edges of the active and confining regions; at least one of the confining regions including a layer of relatively high aluminum fraction aluminum-bearing III-V material between layers of relatively low aluminum fraction aluminum bearing III-V material, the layer of relatively high aluminum fraction material having, at its edges and adjacent the facets, spikes of native oxide of aluminum; and electrodes for applying electric potential across the upper and lower confining regions.
Abstract:
In a form of the disclosure an array of coupled cavities (called minicavities) of a QWH semiconductor laser are defined by a native oxide of an aluminum-bearing III-V semiconductor material and are arranged serially end-to-end along the longitudinal direction. The native oxide confines the injected carriers and optical field within the cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe. Single-longitudinal-mode operation is exhibited over an extended range. In a further form of the disclosure, two linear arrays of end-coupled minicavities are arranged side by side to obtain a two dimensional array, with resultant lateral coupling between the linear arrays. The two dimensional array exhibits mode switching and multiple switching in the light power (L) versus current (I) characteristic (L-I) with increasing current. In another form of the disclosure, a stripe laser is transversely coupled (or side-coupled) with a linear array of end-coupled minicavities. Bistability and switching are demonstrated in the light versus current (L-I) characteristic of a native-oxide-defined structure of this type. The device, with internally coupled elements and the current partitioned among the elements, exhibits a large hysteresis in the L-I curve, with switching from the stimulated to the spontaneous regime occurring over substantial power (light) and current ranges.
Abstract:
A silicon carbide semiconductor device (90), includes: 1) a silicon carbide substrate (1); 2) a gate electrode (7) made of polycrystalline silicon; and 3) an ONO insulating film (9) sandwiched between the silicon carbide substrate (1) and the gate electrode (7) to thereby form a gate structure, the ONO insulating film (9) including the followings formed sequentially from the silicon carbide substrate (1): a) a first oxide silicon film (O) (10), b) an SiN film (N) (11), and c) an SiN thermally-oxidized film (O) (12, 12a, 12b). Nitrogen is included in at least one of the following places: i) in the first oxide silicon film (O) (10) and in a vicinity of the silicon carbide substrate (1), and ii) in an interface between the silicon carbide substrate (1) and the first oxide silicon film (O) (10).
Abstract:
A silicon carbide semiconductor device (90), includes: 1) a silicon carbide substrate (1); 2) a gate electrode (7) made of polycrystalline silicon; and 3) an ONO insulating film (9) sandwiched between the silicon carbide substrate (1) and the gate electrode (7) to thereby form a gate structure, the ONO insulating film (9) including the followings formed sequentially from the silicon carbide substrate (1): a) a first oxide silicon film (O) (10), b) an SiN film (N) (11), and c) an SiN thermally-oxidized film (O) (12, 12a, 12b). Nitrogen is included in at least one of the following places: i) in the first oxide silicon film (O) (10) and in a vicinity of the silicon carbide substrate (1), and ii) in an interface between the silicon carbide substrate (1) and the first oxide silicon film (O) (10).
Abstract:
A holding device is presented in which a layer which is to be oxidized is processed, in a single-substrate process. The process temperature during the processing is recorded directly at the substrate or at a holding device for the substrate. The process includes introducing a substrate, which bears a layer to be oxidized uncovered in an edge region in a layer stack, into a heating device, passing an oxidation gas onto the substrate, heating the substrate to a process temperature, which is recorded during the processing via a temperature of the holding device which holds the substrate, and controlling the substrate temperature to a desired temperature or temperature curve during the processing.
Abstract:
The invention relates to a method of producing a semiconductor device, comprising the following steps consisting in: forming first, second and third semiconductor layers (1, 2, 3), whereby the first and second layers (1, 3) contain a smaller concentration of oxidizable species than the second layer (2); forming a mask (4) on the third layer (3); and oxidizing the second layer (2) with the diffusion of oxidizing species through the third layer (3).
Abstract:
A sample stand is set in a chamber provided with an observation window on its upper surface and a heater for heating a sample is provided in the vicinity of the sample stand. Then, a microscope, a camera and a television monitor are connected and mounted outside the observation window of the chamber. The microscope is mounted such that a specific layer of the sample is focused on and can be observed. According to a manufacturing method of the preset invention, oxidation treatment is performed in such equipment while an oxidation process of the specific layer (semiconductor layer for selective oxidation) of the sample is observed. As a result, the amount of oxidation of the semiconductor layer for selective oxidation can be strictly controlled, a semiconductor light emitting device which restricts a current into a certain region can be obtained with high yield ratio, and there is obtained an oxidation furnace which can precisely control the amount of oxidation of the semiconductor layer for selective oxidation.
Abstract:
A sample stand is set in a chamber provided with an observation window on its upper surface and a heater for heating a sample is provided in the vicinity of the sample stand. Then, a microscope, a camera and a television monitor are connected and mounted outside the observation window of the chamber. The microscope is mounted such that a specific layer of the sample is focused on and can be observed. According to a manufacturing method of the preset invention, oxidation treatment is performed in such equipment while an oxidation process of the specific layer (semiconductor layer for selective oxidation) of the sample is observed. As a result, the amount of oxidation of the semiconductor layer for selective oxidation can be strictly controlled, a semiconductor light emitting device which restricts a current into a certain region can be obtained with high yield ratio, and there is obtained an oxidation furnace which can precisely control the amount of oxidation of the semiconductor layer for selective oxidation.
Abstract:
In a method for fabricating a semiconductor device, a first semiconductor layer of aluminum gallium nitride is first formed on a substrate, and a protection film containing silicon is then formed on the first semiconductor layer in such a manner that a device-isolation region is uncovered. Thereafter, the method further includes the step of heat-treating the first semiconductor layer in an oxidizing atmosphere whose temperature is adjusted to be within a range of 950° C. or more and 1050° C. or less.
Abstract:
A method passivates a surface of a semiconductor structure. The method provides III-V semiconductor material having a surface to be passivated. Upon the surface of the III-V semiconductor material to be passivated an oxide layer is formed. Thereafter, the surface of the III-V semiconductor material having the oxide layer is passivated, without desorption of the oxide layer and in a vacuum of 2null10null6 Torr, with a material having the ability to intermix with the oxide layer so as to exchange oxygen, passivation layer material, and III-V semiconductor material therebetween to form graded layers of oxidized III-V and passivation material.