Abstract:
A gallium nitride (GaN) based light emitting diode (LED), wherein light is extracted through a nitrogen face (N-face) of the LED and a surface of the N-face is roughened into one or more hexagonal shaped cones. The roughened surface reduces light reflections occurring repeatedly inside the LED, and thus extracts more light out of the LED. The surface of the N-face is roughened by an anisotropic etching, which may comprise a dry etching or a photo-enhanced chemical (PEC) etching.
Abstract:
A region-divided substrate includes: a substrate having a first surface and a second surface opposite to the first surface and having a plurality of partial regions, which are divided by a plurality of trenches, wherein each trench penetrates the substrate from the first surface to the second surface; a conductive layer having an electrical conductivity higher than the substrate and disposed on a sidewall of one of the plurality of partial regions from the first surface to the second surface; and an insulator embedded in each trench.
Abstract:
Two light receiving elements are formed on a support substrate. A first light receiving element is formed of a p-type layer, an n-type layer, a light absorption semiconductor layer, an anode electrode, a cathode electrode, a protection film, etc. A second light receiving element is formed of a p-type layer, an n-type layer, a transmissive film, an anode electrode, a cathode electrode, a protection film, etc. The light absorption semiconductor layer absorbs light in a wavelength range λ and disposed closer to the light receiving surface than is the pn junction region. The transmissive film has no light absorption range and disposed closer to the light receiving surface than is the pn junction region. The amount of light in the wavelength range λ is measured through computation using a detection signal from the first light receiving element and a detection signal from the second light receiving element.
Abstract:
A semiconductor device includes a first semiconductor substrate, a second semiconductor substrate, and a sealing member. The first semiconductor substrate has a surface and includes a sensing portion on the surface side. The sensing portion has a movable portion. The first semiconductor substrate and the second semiconductor substrate are bonded together to form a stacked substrate. The stacked substrate defines a hermetically sealed space for accommodating the sensing portion between the first and second semiconductor substrates. The stacked substrate further defines a recess extending between the first semiconductor substrate and the second semiconductor substrate to penetrate an interface between the first semiconductor substrate and the second semiconductor substrate. The sealing member is located in the recess.
Abstract:
A semiconductor device includes: a SOI substrate including a support layer, a first insulation film and a SOI layer; a first circuit; a second circuit; and a trench separation element. The SOI substrate further includes a first region and a second region. The first region has the support layer, the first insulation film and the SOI layer, which are stacked in this order, and the second region has only the support layer. The trench separation element penetrates the support layer, the first insulation film and the SOI layer. The trench separation element separates the first region and the second region. The first circuit is disposed in the SOI layer of the first region. The second circuit is disposed in the support layer of the second region.
Abstract:
An angular velocity sensor includes first and second oscillators and a coupling beam. The coupling beam couples the first and second oscillators together in such a manner that the first and second oscillators vibrate relative to each other in a predetermined direction. The coupling beam includes a first post portion joined to a surface of the first oscillator, a second post portion joined to a surface of the second oscillator, and a spring portion that joins the first post portion to the second post portion. The spring portion is spaced from the first and second oscillators and has elasticity in the predetermined direction.
Abstract:
An oscillating angular speed sensor includes a detector, a driving portion, and a separating portion. When an angular speed is generated while the detector is driven to oscillate by the driving portion, Coriolis force is applied to the detector. Therefore, the angular speed is detected based on a capacitance variation in accordance with a variation of an interval between a movable electrode and a fixed electrode of the detector. The separating portion is distanced from the detector and the driving portion, and is configured to separate a first space accommodating the detector and a second space accommodating the driving portion.
Abstract:
A method for manufacturing a semiconductor device includes: preparing a wafer formed of a SOI substrate; forming a circuit portion in a principal surface portion; removing a support substrate of the SOI substrate; fixing an insulation member on a backside of a semiconductor layer so as to be opposite to the circuit portion; dicing the wafer and dividing the wafer into multiple chips; arranging a first conductive member on the insulation member so as to be opposite to a part of the low potential reference circuit, and arranging a second conductive member on the insulation member so as to be opposite to a part of the high potential reference circuit; and coupling the first conductive member with a first part of the low potential reference circuit, and coupling the second conductive member with a second part of the high potential reference circuit.
Abstract:
An ultrasonic sensor for detecting an object includes: a piezoelectric element having a piezoelectric body and first and second electrodes for sandwiching the piezoelectric body; an acoustic matching element having a reception surface, which receives an ultrasonic wave reflected by the object; and a circuit electrically coupled with the piezoelectric element via a wire. The piezoelectric element is embedded in the acoustic matching element so that the acoustic matching element covers at least the first electrode, a part of a sidewall of the piezoelectric element and a part of the wire between the circuit and the piezoelectric element, and the sidewall of the piezoelectric element is adjacent to the first electrode.
Abstract:
A semiconductor device includes: a sensor including a sensor structure on a first side of the sensor and a periphery element surrounding the sensor structure; and a cap covering the sensor structure and having a second side bonded to the first side of the sensor. The cap includes a first wiring layer on the second side of the cap. The first wiring layer steps over the periphery element. The sensor further includes a sensor side connection portion, and the cap further includes a cap side connection portion. The sensor side connection portion is bonded to the cap side connection portion. At least one of the sensor side connection portion and the cap side connection portion provides an eutectic alloy so that the sensor side connection portion and the cap side connection portion are bonded to each other.