Abstract:
A capacitor for sensing the substrate voltage is efficiently and economically realized simply by isolating a portion or segment of the metal layer that normally covers the heavily doped perimetral region of electric field equalization and, in correspondence of such a metal segment isolated by the remaining portion, by not removing preventively the isolation dielectric layer of silicon oxide from the surface of the semiconductor substrate, as it is normally done on the remaining portion of the perimetral edge region before depositing the metal. The unremoved layer of isolated silicon oxide becomes the dielectric layer of the so constituted capacitor, a plate of which is the heavily doped perimetral region that is electrically connected to the substrate (drain or collector region) while the other plate is constituted by the segment of metal, isolated from the remaining metal layer defined directly over the heavily doped perimetral region.
Abstract:
A particle detector formed in a chip of semiconductor material comprises:
a first layer (42) with a first type of conductivity (n) having a surface on the first major surface of the chip, a second layer (40) with the first type of conductivity (n) having a surface on the second major surface of the chip, a third layer (41) with the first type of conductivity (n) having a resistivity lower than those of the first and second layers and disposed between the first layer (42) and the second layer (40), a first region (46) with a second type of conductivity (p), extending from the first surface into the first layer (42), a second region (45) with the second type of conductivity (p), extending from the second major surface into the second layer (40), and first (48), second (50,51) and third (43,47) electrical connection means for connection with the first region (46) with the second region (45), and with the third layer (41), respectively.
To produce a position detector which does not require a large number of connections, the second electrical connection means comprise two electrodes (50,51) arranged a predetermined distance apart on the surface of the second region (45).
Abstract:
A semiconductor power device (3) comprising a P-type substrate (4) and an N-type epitaxial layer (5) comprises a lateral DMOS transistor (1,2) having a source region (10,11) and a drain region (12) formed in the epitaxial layer (5) and a body region (8,9) housing the source region (10,11). Between the source region (10,11) and the drain region (12) is present an insulating region (13,14) extending from a top surface (15) of the epitaxial layer (5) to the substrate (4). The insulating region (13,14) has an opening in a longitudinal direction (Y) defining a channelling region for a current I D flowing between the source region (10,11) and the drain region (12) of the lateral DMOS transistor (1,2).
Abstract:
A process for forming a thin layer of Silicon nanocrystals in an oxide layer is disclosed. The process comprises, on a semiconductive substrate, thermally oxidizing a first portion of the substrate into an oxide layer, forming Silicon ions within the layer of oxide, and thermally treating the Silicon ions to become the thin layer of Silicon nanocrystals. In the inventive process the formation of the Silicon ions is by ionic implantation of the Silicon ions into the oxide at an ionization energy of between .1 keV and 7keV, and preferably between 1 and 5 keV. This allows the Silicon atoms to coalesce in a lower temperature than would otherwise be possible. Additionally, more than one layer of nanocrystals can be formed by performing more than one implantation at more than one energy level. Embodiments of the invention can be used to form non-volatile memory devices with a very high quality having a very small size.
Abstract:
The present invention relates to a circuit (20) for dynamic control of a power transistor in applications for high voltage and of the type wherein a power transistor (TR1) has a conduction terminal (C) connected to a load and a control terminal (G1) receiving a driving signal from a driver block (4) activated by a trigger signal (Vin) received on a circuit input terminal (IN1). Advantageously, the circuit (20) comprises a JFET component (TR2) inserted between the conduction (C) and control (G1) terminal of the power transistor (TR1) and equal to a resistance with non-linear feature. Moreover, the JFET component (TR2) is monolithically integrated in the structure of said power transistor (TR1).
Abstract:
The following steps are performed on a wafer of semiconductor material having a layer (1) with n conductivity: a) implanting n impurity ions and p impurity ions in an area of the layer and subjecting the wafer to a high-temperature treatment; the impurities, the implantation doses and energies, and the high-temperature treatment time and temperature being such as to form a first, p region (49) and a second, n region (50) which forms a pn junction with the first region (49); b) hollowing out a trench (43) which intersects the first region (49) and the second region (50), c) forming a dielectric coating (44) on the lateral surface of the trench (43), d) depositing electrically-conductive material (51) in the trench (43) in contact with the dielectric (44), and e) forming elements (60, 61, 62) for electrical contact with the layer (1), with the second region (50), and with the electrically-conductive material (51) inside the trench (43), in order to produce drain (D), source (S) and gate (G) electrodes of the MOSFET, respectively. A submicrometric vertical-channel MOSFET of optimal quality and reproducibility is thus produced by a method compatible with DPSA technology.
Abstract:
A power IGBT device is described being monolithically integrated and comprising an input terminal (I10) suitable to receive an input voltage (Vin) and an output terminal (O10) suitable to supply a current (Iout) with limited and predetermined highest value. Such IGBT device comprising an IGBT power element (2) inserted between said output terminal (O10) and a supply reference (GND) and having a control terminal (15) connected to the input terminal (110) by means of a control circuit (12) comprising at least a transistor (18) inserted between the control terminal (15) and the supply reference (GND) and a resistive element (Rc) inserted between the input terminal (I10) and the control terminal (15).