Abstract:
PROBLEM TO BE SOLVED: To provide a dielectric having a reduced dielectric constant, and to provide its manufacturing method. SOLUTION: In a first embodiment, a first method of manufacturing a dielectric having a reduced dielectric constant is provided. The first method includes the steps of: (1) forming a dielectric layer including a trench on a substrate; and (2) forming a cladding region in the dielectric layer by forming a plurality of air gaps in the dielectric layer along at least one of a sidewall and a bottom of the trench so as to reduce an effective dielectric constant of the dielectric. Numerous other aspects are provided. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for manufacturing a semiconductor and a device structure which suppress the latch-up in a bulk CMOS device. SOLUTION: The method includes a step of forming a trench in a semiconductor material of a substrate, while the trench has a first side wall disposed between a pair of doped wells demarcated in the semiconductor material of the substrate. The method further includes a step of forming an etching mask in the trench to mask partially the basal surface of the trench, and successively a step of removing the semiconductor material of the substrate exposing in the basal surface which has been partially masked and demarcating a second side wall which deepens the trench and has been narrowed. A dielectric material is filled in the deepened trench to demarcate trench separation regions of devices constructed in the doped wells. The dielectric material filled in the extended part of the deepened trench improves the suppression of the latch-up. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a semiconductor device adapted to reduce latchups. SOLUTION: The semiconductor device includes (1) a shallow-trench-isolation (STI) oxide region; (2) a first metal-oxide-semiconductor field-effect transistor (MOSFET) coupled to a first side of the STI oxide region; (3) a second MOSFET coupled to a second side of the STI oxide region, wherein the portions of the first and second MOSFETs are coupled into a loop to form first and second bipolar junction transistors (BJTs); and (4) a dopant-implanted region, formed below the STI oxide region, where the dopant-implanted region forms a portion of the BJT loop and is adapted to reduce a gain of the loop. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To improve a leakage current characteristic at or below the threshold of a trench discrete type FET element. SOLUTION: A slot in a vertical direction is formed in an stacked structure 14 adhered to a silicon substrate 10 covered with an oxide 12, and thereafter a spacer is formed on the sidewall of the slot. Then, a trench is formed in the substrate 10 by etching. A horizontal ledge appears adjacent to the trench, on the exposed surface of the substrate covered with the oxide by removal of the spacer. The conduction of an end in the element is suppressed by injecting a proper impurity into this ledge. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a switched body SOI CMOS circuit which is provided with an FET element for increasing a FET element threshold voltage. SOLUTION: A circuit having an SOI element is connected with a body bias voltage, via a switch for selectively connecting a body bias voltage signal with an SOI element body. An NMOS or PMOS SOI element is used as the switched body SOI element. An FET is used as a switch. A gate terminal of the SOI element is connected with an FET element. A gate of the SOI element controls the FET switch connection of the body bias voltage signal to the SOI element, and adjusts a threshold value voltage of the SOI element. A logic circuit including the SOI element and a fabrication process for the SOI element are similarly disclosed. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To adjust the threshold voltage at the corner of a device without requiring any additional mask by doping the central part of a channel region at some concentration and doping a channel region adjacent to a corner region at a higher concentration. SOLUTION: N type (arsenic) dopant ions 19 are implanted compensatingly. The compensatory implantation is performed in order to compensate for the threshold voltage implantation at the part of the side wall of STI trench structures 18a-18c contiguous to the corner of a substrate 12 other than the corner region 25 and to suppress the effect of P-type ion implantation 21 in the channel region onto the following stage by means of N type doping ions 19 so that the corner region 25 has a higher doping concentration after boron B doping stage. A spacer 16 prevents the compensatory implantation at the corner of the device except the central channel regions 20a, 20b, 20c and 20d.
Abstract:
Dual work function doping is provided by doping a selected number of gate structures having self-aligned insulating layer on top of the structures through at least one side wall of the gate structures with a first conductivity type to thereby provide an array of gate structures whereby some are doped with the first conductivity type and others of the gate structures are doped with a second and different conductivity type. Also provided is an array of gate structures whereby the individual gate structures contain self-aligned insulating layer on their top portion and wherein some of the gate structures are doped with a first conductivity type and other of the gate structures are doped with a second and different conductivity type.
Abstract:
A driver circuit is provided which includes a field effect transistor having first and second spaced apart semiconductor regions of a given conductivity type and a third semiconductor region of a conductivity type opposite to the given conductivity type interposed between the first and second regions and having a given sustaining voltage serially connected with a capacitor. The circuit further includes means for applying between the first and second spaced apart regions a given supply voltage having a magnitude greater than the magnitude of the sustaining voltage and less than the breakdown voltage of a PN junction formed in the transistor and means including a control voltage applied to the gate electrode of the transistor for initiating current flow between the first and second spaced apart regions when the given supply voltage is applied between the first and second spaced apart regions.