Abstract:
A radiation responsive semiconductor imaging device comprising an array of charge storage devices arranged in rows and columns on the surface of a semiconductor substrate. Each storage device includes a conductor-insulator-semiconductor structure in which minority carriers, controllably generated within the semiconductor in proportional response to incident electromagnetic radiation flux, are stored at the surface of the semiconductor beneath the conductor due to the application of a depletion region forming voltage to the conductor. Means are disclosed for transferring the integrated electrical charge from the storage region to a receiver region for electrical readout of the stored information. Means for reading out selected electrical charges while continuing to store other electrical charges are also disclosed. Means are also disclosed for altering the sensitivity of the array without a sacrifice in dynamic range.
Abstract:
Improved semiconductor field-effect transistors have selfregistration and electrical insulation. Conductivity-modified, surface adjacent source and drain regions are formed by diffusing dopants through gate-oxide layer. One embodiment features a conducting gate electrode which is formed from a thin deposited film. In this embodiment a large region of opposite-conductivitytype semiconductor is formed by diffusion through both conducting and oxide films. Complementary ''''N-channel'''' and ''''P-channel'''' devices may be formed on the same substrate by combining two separate embodiments. In such devices the original conductivitytype semiconductor is the base for one FET, while the large conductivity-modified-type region is the base for the other FET. Such modules may be interconnected to form integrated circuits capable of performing a variety of logical functions.
Abstract:
An improved field-effect transistor having an exceedingly short channel length is described wherein a single edge defines the boundaries of both the source and drain regions. In one embodiment a gate electrode is formed over a thin oxide layer deposited on a semiconductor wafer of a first-conductivity type. An opposite-conductivity type impurity is diffused into the wafer adjacent the gate electrode. A first-conductivity-type impurity is diffused within the opposite-conductivity-type region forming a field-effect transistor having one edge of the gate electrode defining the boundary between the source and channel and the drain and channel regions. In another embodiment an edge of an insulating layer defines the boundaries of the source and drain regions. A method for fabricating isolated resistance elements is also disclosed.
Abstract:
A transistor, such as NPN type, for example, is fabricated by first diffusing a heavily doped P-type base contact region into an N-type semiconductor layer epitaxially grown on a heavily doped N-type semiconductor wafer. Holes are etched through the base contact region into the N-type layer and strongly N-type semiconductor material containing both N-type impurities and faster diffusing P-type impurities is epitaxially grown so as to fill the holes. The wafer is then heated to diffuse the P-type impurities so as to form a base region of controlled thickness, simultaneously forming emitter-base and base-collector junctions. Emitter contact is made by contacting the material epitaxially grown in the holes. Other type semiconductor devices, such as semiconductor controlled rectifiers, may also be fabricated in this manner.
Abstract:
A method and apparatus for storing and transferring information employing a conductor-insulator-semiconductor (CIS) structure as the storage and transfer apparatus is disclosed herein. The CIS structure is initially charged to a predetermined voltage thereby forming a depletion region within the semiconductor beneath the insulated conductor. Minority carriers controllably generated within the semiconductor are stored at the surface of the semiconductor beneath the insulated conductor by an electric field existing in the depletion region, thus changing the predetermined voltage. Means for transferring the stored charge along the surface of the semiconductor are disclosed.
Abstract:
A high frequency CIS capacitance device having a substrate of one conductivity type provides a pair of values of capacitance for a high frequency signal applied across a pair of capacitance electrodes thereof. One of the values of capacitance is dependent on applying a control potential on a control electrode to the surface adjacent region underlying one of the capacitance electrodes through a channel region of opposite conductivity and greater in magnitude than the surface potential of the surface adjacent region to drain the surface adjacent region of charge carriers therein. Means are provided for alternatively establishing the channel region to produce one value of capacitance corresponding to depletion of charge carrriers from the surface adjacent region or another value of capacitance corresponding to establishing another value of surface potential in this surface adjacent region by other means. Such other means may be by applying another control potential through another channel region of opposite conductivity or by generation of charge carriers within the substrate. Composite devices are formed of elemental devices such as described in which the capacitance of the composite device is the sum of the capacitance of the elemental devices and is variable in discrete increments to provide a large number of discrete values of capacitance in response to digital signals applied to a minimum number of control electrodes connected thereto.
Abstract:
An electromechanical filter in monolithic silicon integrated circuitry is formed with a resonator member bridging a cavity and having a strain-sensitive piezoresistive pickoff element formed therein. When the resonator member is driven electrostrictively, capacitively, electromagnetically, magnetostrictively or magnetically, an AC output signal is provided by the pickoff element at a frequency dependent upon the mechanical characteristics of the member. The filter is fabricated by burying a silicon nitride slab within an epitaxially formed crystal and thereafter first etching out a pair of regions to define the sides of the resonant member and next etching away the silicon nitride slab to form a cavity beneath the resonator member.
Abstract:
IMPROVED SEMICONDUCTOR FIELD-EFFECT TRANSISTORS HAVE SELF-REGISTRATION AND ELECTRICAL INSULATION. CONDUCTIVITYMODIFIED, SURFACE-ADJACENT SOURCE AND DRAIN REGIONS ARE FORMED BY DIFFUSING DOPANTS THROUGH GATE-OXIDE LAYER. ONE EMBODIMENT FEATURES A CONDUCTING GATE ELECTRODE WHICH IS FORMED FROM A THIN DEPOSITED FILM. IN THIS EMBODIMENT A LARGE REGION OF OPPOSITE-CONDUCTIVITY-TYPE SEMICONDUCTOR IS FORMED BY DIFFUSION THROUGH BOTH CONDUCTING AND OXIDE FILMS. COMPLEMENTARY "N-CHANNEL" AND "P-CHANNEL" DEVICES MAY BE FORMED ON THE SAME SUBSTRATE BY COMBINING TWO SEPARATE EMBODIMENTS. IN SUCH DEVICES THE ORIGINAL CONDUCTIVITY-TYPE SEMICONDUCTOR IS THE BASE FOR ONE FET, WHILE THE LARGE CONDUCTIVITY-MODIFIED TYPE REGION IS THE BASE FOR THE OTHER FET. SUCH MODULES MAY BE INTERCONNECTED TO FORM INTEGRATED CIRCUITS CAPABLE OF PERFORMING A VARIETY OF LOGICAL FUNCTIONS.
Abstract:
SELF-REGISTERED FIELD-EFFECT TRANSISTORS ARE BUILT BY FORMING THE GATE THEREOF AT THE SAME TIME THE CHANNEL-ADJACENT PORTION OF THE SOURCE AND DRAIN REGIONS ARE DEFINED. IN ONE EMBODIMENT A REFACTORY METALLIC FILM IS DEPOSITED OVER AN INSULATING FILM AND ETCHED TO FORM THE GATE. SUBSEQUENTLY, THE METALLIC FILM MAY SERVE AS A DIFFUSION MASK, ALTHOUGH THIS IS NOT ESSENTIAL. THE METALLIC FILM IS PATTERNED BY PHOTORESIST MASKING AND ETCHING. THE PORTION OF THE METALLIC FILM OVERLYING THE CHANNEL REGION OF THE SEMICONDUCTOR BODY THEREOF IS USED AS A GATE. AS A RESULT OF SIMULTANEOUS DEFINITION OF THE CHANNEL-ADJACENT PLORTIONS OF SOURCE AND DRAIN REGIONS AND PATTERNING OF THE CHANNELALIGNED PORTIONS OF THE GATE, WHEN SOURCE AND DRAIN REGIONS ARE FORMED BY DIFFUSION OF ACTIVATORS INTO THE SILICON WAFER, AUTOMATIC REGISTRATION OF THE GATE-ADJACENT PORTIONS OF THE SOURCE AND DRAIN JUNCTIONS BENEATH THE GATE IS ACHIEVED.