摘要:
A transistor characteristic calculation apparatus using a large signal equivalent circuit model has a buffer trap circuit provided between a drain terminal and a source terminal such that a parallel circuit including a resistor and a capacitor, a diode, and another parallel circuit including a resistor and a capacitor are in turn connected in series.
摘要:
In the present invention, provided is a semiconductor device, including: a GaN channel layer which is provided on a substrate and through which electrons run; a barrier layer which is provided on the GaN channel layer and which contains at least one of In, Al, and Ga and contains N; a gate electrode which is provided on the barrier layer; and a source electrode and a drain electrode which are provided on the substrate across the gate electrode, in which, in a portion of the barrier layer between the gate electrode and the drain electrode, a magnitude of polarization of the barrier layer is smaller on the gate electrode side than on the drain electrode side. Thus, PAE can be improved by reducing Rd and Cgd simultaneously.
摘要:
An MIS transistor manufacturing method which can prevent unwanted diffusion of extensions caused by the drive to the source/drain so that the diffusion of the source/drain and the diffusion of the extensions can independently be controlled so as to obtain optimum structure for each. Source/drain are formed by ion implantation using, as a mask, L-shaped silicon nitride films formed on sides of a gate electrode and silicon oxide films covering the silicon nitride films. The silicon oxide films are then removed leaving the silicon nitride films. Impurity ions are then ion-implanted into the main surface of the silicon substrate through the silicon nitride films. Since the silicon nitride films are thicker in the vicinity of the gate electrode and thinner in the vicinity of the source/drain, this process forms extensions penetrating under the gate electrode for a small distance.
摘要:
A thin film forming apparatus using laser includes a chamber (1), a target (5) placed therein, a laser light source (10) for emitting laser beam to target (5), and a substrate holder (3). When target (5) is irradiated with laser beam (16), a plume (15) is generated, and materials included in plume (15) are deposited on the surface of a substrate (2) held by substrate holder (3). The laser beam emitted from laser light source (10) has its cross section shaped to a desired shape when passed through a shielding plate (4804), for example, so that the surface of the target (5) is irradiated with the beam having uniform light intensity distribution. Therefore, a plume (15) having uniform density distribution of active particles is generated, and therefore a thin film of high quality can be formed over a wide area with uniform film quality, without damaging the substrate.
摘要:
A device includes a source for transmitting an electronic charge through a conduction path; a drain for receiving the electronic charge; a stack for providing at least part of the conduction path; and a gate operatively connected to the stack for controlling a conduction of the electronic charge. The stack includes an insulator layer, an N-polar layer and a barrier layer selected such that, during an operation of the device, the conduction path formed in the N-polar layer includes a two-dimensional electron gas (2DEG) channel and an inversion carrier channel.
摘要:
It is an object to attain both high gain and a broad band (that is, to attain both reduction in a gate-drain capacitance and reduction in a source-drain capacitance). Provided is a semiconductor device, including: a GaN channel layer (3) through which electrons travel; a barrier layer (4) which is provided on the GaN channel layer in order to form two-dimensional electron gas in the GaN channel layer and which contains at least any one of In, Al, and Ga and contains N; a gate electrode (8), a source electrode (6), and a drain electrode (7); and a plate (20) formed of a material having polarization, which is provided between the gate electrode (8) and the drain electrode (7), the plate being held in contact with a part of the barrier layer (4).
摘要:
An isolation layer for suppressing a leakage current is provided at least between a channel layer and a buffer layer formed under the channel layer in the buffer layer.
摘要:
A field-effect transistor including a gate electrode, silicon layers, and source and drain regions at a surface of a silicon substrate. Sidewall insulating films on the opposite side surfaces of the gate electrode are located between the gate electrode and the silicon layers and contain respective voids.
摘要:
In a method of manufacturing a semiconductor device capable of reducing gate resistance by increasing the width of a conductive layer formed on a gate electrode without increasing the gate length, an extension is formed in an upper surface of a silicon substrate, and thereafter a silicon oxide film and a silicon nitride film are deposited on the overall surface. Then, the silicon nitride film and the silicon oxide film are anisotropically etched in this order. Then, another silicon oxide film is deposited on the overall surface and thereafter anisotropically etched. Then, ion implantation is performed through a gate electrode and a side wall serving as masks, to form an impurity region. Silicon is grown under conditions having selectivity for a silicon oxide film, to form a silicon growth layer. Then, cobalt is deposited on the overall surface and thereafter heat treatment is performed to form a cobalt silicide layer. Thereafter unreacted cobalt is removed.
摘要:
An FET chip is configured to include an oscillation suppression circuit that has a gate capacitance C formed between a gate electrode 5c and two-dimensional electron gas, and a channel resistance R between the gate electrode 5c and a source electrode 7c, and therefore the oscillation suppression circuit is loaded by only an FET process to make an MMIC design unnecessary, so that it is possible to attain stabilization of an FET while suppressing increase in cost, and to suppress oscillation.