摘要:
The invention is directed to reducing of the number of steps in a BiCMOS process. A first N-well 3A and a second N-well 3B are formed deeply on a surface of a P-type semiconductor substrate. A first P-well 4A is formed in the first N-well 3A, and an N-channel MOS transistor is formed in the first P-well 4A. The second N-well 3B is used as a collector of a vertical NPN bipolar transistor. A second P-well 4B is formed in the second N-well 3B. The second P-well 4B is formed simultaneously with the first P-well 4A. The second P-well 4B is used as a base of the vertical NPN bipolar transistor. An Nnull emitter layer and a Pnull base electrode layer of the vertical NPN bipolar transistor are formed on a surface of the second P-well 4B.
摘要:
The invention provides an elevated photodiode for image sensors and methods of formation of the photodiode. Elevated photodiodes permit a decrease in size requirements for pixel sensor cells while reducing leakage, image lag and barrier problems typically associated with conventional photodiodes.
摘要:
One end of each of five resistors is connected to each of the two ends and the respective intermediate points of a cascade of four depression-type FETs, while the other ends of the five resistors are provided with a predetermined voltage. This configuration fixes the source-drain potential of the four FETs. This fixing of the source-drain potential of the FETs permits stable application of a bias voltage for turning ON the FETs between the gate and the source each FET, so as to ensure the ON-OFF switching of the FETs.
摘要:
A method of reducing the contact resistance of metal suicides to the pnull silicon area or the nnull silicon area of the substrate comprising: (a) forming a metal germanium (Ge) layer over a silicon-containing substrate, wherein said metal is selected from the group consisting of Co, Ti, Ni and mixtures thereof; (b) optionally forming an oxygen barrier layer over said metal germanium layer; (c) annealing said metal germanium layer at a temperature which is effective in converting at least a portion thereof into a substantially non-etchable metal silicide layer, while forming a SinullGe interlayer between said silicon-containing substrate and said substantially non-etchable metal silicide layer; and (d) removing said optional oxygen barrier layer and any remaining alloy layer. When a Co or Ti alloy is employed, e.g., ConullGe or TinullGe, two annealing steps are required to provide the lowest resistance phase of those metals, whereas, when Ni is employed, a single annealing step forms the lowest resistance phase of Ni silicide.
摘要:
Shift register electrodes are formed in an imaging area and a peripheral area through use of a single layer of conductive film, and a thick insulating film is deposited over those electrodes and planarized. The thick insulating film overlying the shift register electrodes in the peripheral area is kept as it is and on the other hand, the thick insulating film overlying the shift register electrodes is etched to just fill gaps between the shift register electrodes with the film, thereby allowing a light shielding metal layer overlying the shift register electrodes in the peripheral area and insulating films sandwiched therebetween to be formed without discontinuity. Since metal interconnect lines in the peripheral area have a thick and planarized insulating film formed thereunder, parasitic capacitance between diffusion layers/electrodes and the metal interconnect lines can be reduced, leading to reduction in power consumption of image sensor.
摘要:
A fabrication process for a Schottky barrier structure includes forming a nitride layer directly on a surface of an epitaxial (nullepinull) layer and subsequently forming a plurality of trenches in the epi layer. The interior walls of the trenches are then deposited with a final oxide layer without forming a sacrificial oxide layer to avoid formation of a beak bird at the tops of the interior trench walls. A termination trench is etched in the same process step for forming the plurality of trenches in the active area.
摘要:
An integrated circuit includes an output buffer operable to drive an output node. The output buffer may comprise a MOSFET having a JFET integrated within a portion of a drain region of the MOSFET. The JFET may comprise a gate of second conductivity formed in semiconductor material of first conductivity type, which is contiguous with the drain region for the MOSFET. A voltage shaping circuit may control a bias of the JFET gate in accordance with the voltage levels of an output node and a predetermined output impedance.
摘要:
Various methods for forming semiconductor devices are provided that include the step of implanting dopants into the devices to achieve doping concentrations that allow complementary n- and p-channel SJT behavior with devices of substantially equal gate length and gate width. Moreover, complementary SJT devices are provided that include n- and p-channel devices that have approximately equal gate lengths and widths. SJT devices may be appropriately doped and configured such that input current and the output current both vary substantially exponentially with a gate-source voltage in the sub-threshold mode, and such that the drain current varies substantially linearly with the gate current through a substantially constant current gain that is given by a ratio of the drain current to the gate current.
摘要:
Noise-reduced semiconductor devices operating at a high frequency band greater than several GHz are disclosed. Also disclosed is a method for manufacturing such semiconductor devices. A trench penetrating through a semiconductor substrate is configured to surround a noise-generating circuit block and/or a noise-susceptible circuit block, in order to reduce noise propagation through the substrate. Noise-reduced semiconductor device are fabricated with a conventional silicon wafer instead of an SOI (Silicon on Insulator) wafer, which is manufactured in a complicated process sequence.
摘要:
A composite module and its production process which allow multiple functions, miniaturization, low power consumption and low costs without requiring any external chip parts at all. A high-frequency integrated circuit is embedded in a silicon substrate, a high-frequency high-capacity bypass capacitor and a matching coil using thin films of different types of materials are also formed on the silicon substrate, a high-frequency high-capacity bypass capacitor is further formed with an interlayer insulation film between them, and these elements and the high-frequency integrated circuit are connected via a wiring layer.