摘要:
A Schottky barrier diode includes a first semiconductor layer and a second semiconductor layer successively formed above a substrate; and a high-resistance region formed in the first semiconductor layer and the second semiconductor layer and having higher resistance than the first semiconductor layer and the second semiconductor layer. A Schottky electrode and an ohmic electrode spaced from each other are formed on the second semiconductor layer in a portion surrounded with the high-resistance region.
摘要:
Provided is an electron emitting device which can achieve high electron emission efficiency even in the case where excitation energy is low. The device includes a carbon nanotube layer which is formed on an SiC substrate and is made up of plural carbon nanotubes vertically oriented with respect to a surface of the SiC substrate; an MgO layer which is formed on and touches the carbon nanotube layer; an ohmic electrode which is connected to the carbon nanotube layer; an electrode which is facing the MgO layer with an air-gap between the MgO layer and the electrode; and a voltage source which applies a voltage between the electrode and the ohmic electrode.
摘要:
A nitride semiconductor device includes: a first semiconductor layer made of first nitride semiconductor; a second semiconductor layer formed on a principal surface of the first semiconductor layer and made of second nitride semiconductor having a bandgap wider than that of the first nitride semiconductor; a control layer selectively formed on, or above, an upper portion of the second semiconductor layer and made of third nitride semiconductor having a p-type conductivity; source and drain electrodes formed on the second semiconductor layer at respective sides of the control layer; a gate electrode formed on the control layer; and a fourth semiconductor layer formed on a surface of the first semiconductor layer opposite to the principal surface, having a potential barrier in a valence band with respect to the first nitride semiconductor and made of fourth nitride semiconductor containing aluminum.
摘要:
A method for forming a via in a sapphire substrate with a laser machining system that includes an ultrafast pulsed laser source. The sapphire substrate is provided. Pulses of laser light are substantially focused to a beam spot on the first surface of the sapphire substrate such that each focused pulse of laser light ablates a volume of the sapphire substrate having a depth less than the substrate thickness. The beam spot of the focused laser light pulses is scanned over a via portion of the first surface of the sapphire substrate. The sapphire substrate is moved in a direction substantially normal to the first surface to control the volume of the sapphire substrate ablated by each pulse of laser light to be substantially constant. The pulsing and scanning steps are repeated until the via is formed extending from the first surface to the second surface of the sapphire substrate.
摘要:
A semiconductor laser device includes a substrate which is made of, e.g., silicon and which has in its principal surface first and second recessed portions formed at a distance from each other. Disposed in the first recessed portion is a first semiconductor laser chip in the form of a function block, which emits an infrared laser beam. Disposed in the second recessed portion is a second semiconductor laser chip in the form of a function block, which emits a red laser beam.
摘要:
A laser module includes a substrate 1, a first laser element 2 placed on the substrate 1, a second laser element 3 placed with an output surface opposed to the first laser element 2 on the substrate 1, and a mirror 7 placed between the first laser element 2 and the second laser element 3. The mirror 7 has a reflective surface capable of reflecting output light from the first laser element 2 or the second laser element 3 in a predetermined direction, and is placed so as to move or rotate between a first position capable of reflecting the output light from the first laser element 2 and a second position capable of reflecting the output light from the second laser element 3. Thus, a laser module can be provided in which high precision, low cost, and miniaturization can be realized.
摘要:
A switching semiconductor device includes a first compound layer formed on a single crystal substrate which includes silicon carbide or sapphire, and including a general formula InxGa1-xN, where 0≦x≦1; a second compound layer formed on the first compound layer, and including a general formula InyALzGa1-y-zN, where 0≦y≦1 and 0
摘要翻译:开关半导体器件包括形成在包括碳化硅或蓝宝石的单晶衬底上的第一复合层,并且包括通式为N 1 Ga 1-x N,其中 0 <= x <= 1; 形成在第一化合物层上的第二化合物层,并且包含通式为Y 1,Y z,Ga 1-y z N,其中0 < = y <= 1,0
摘要:
A Schottky barrier diode includes a first semiconductor layer and a second semiconductor layer successively formed above a semiconductor substrate with a buffer layer formed between the first and second semiconductor layers and the semiconductor substrate. A Schottky electrode and an ohmic electrode spaced from each other are formed on the second semiconductor layer, and a back face electrode is formed on the back face of the semiconductor substrate. The Schottky electrode or the ohmic electrode is electrically connected to the back face electrode through a via penetrating through at least the buffer layer.
摘要:
In a semiconductor device fabrication method using a fluidic self-assembly technique in which in a liquid, a plurality of semiconductor elements are mounted in a self-aligned manner on a substrate with a plurality of recessed portions formed therein, protruding potions that are inserted in the respective recessed portions of the substrate are formed in the lower portions of the respective semiconductor elements, the liquid in which the semiconductor elements have been spread is poured over the substrate intermittently, and the substrate is rotated in a period of time in which the liquid is not poured.
摘要:
An acoustic resonator includes: a substrate; a resonator film which is supported above the main surface of the substrate and includes a piezoelectric film and a pair of a top electrode and a bottom electrode which are formed on part of the top surface and part of the bottom surface of the piezoelectric film, respectively, to face each other via the piezoelectric film; and a support which is formed on the main surface of the substrate to support the resonator film from below. A resonance cavity is provided in part of a region between the substrate and the resonator film below at least a portion of part of the resonator film where the top electrode and the bottom electrode coincide with each other and an isolation cavity is provided in other part of said region where the support and the resonance cavity do not exist.