Abstract:
A METHOD FOR FABRICATING DIELECTRIC ISOLATED INTEGRATED DEVICES WHICH ALLOWS THE OF FORMATION OF A TRULY PLANAR SURFACE. THE METHOD INCLUDES ETCHING ISOLATION CHANNELS IN A SEMICONDUCTOR SUBSTRATE THROUGH A SUITABLE MASK. THE MASK PATTERN IS DESIGNED TO ENHANCE DEEPER ETCHING AT CERTAIN LOCATIONS IN THE ISOLATION CHANNELS. A DIELECTRIC LAYER IS FORMED OVER THE EXPOSED SURFACES OF THE ISOLATION CHANNELS AND A SEMICONDUCTOR MATERIAL IS GROWN IN THE CHANNELS. THE DEEPER ETCHED LOCATIONS WHICH ARE NOW FILLED WITH DIELECTRIC ISOLATION ARE USED AS A DEPTH GUIDE IN THE FORMATION OF A DIELECTRIC LAYER FROM THE SEMICONDUCTOR SUBSTRATE SURFACE OPPOSITE TO THE ONE FROM WHICH THE ETCHING TOOK PLACE. THE DEPTH GUIDE CAN BE USED IN EITHER A DEEP ETCH OR LAP-BACK PROCESS. THE LAST ISOLATION STEP IS THEN TO CONTINUE THE DIELECTRIC LAYER PAST THE DEPTH GUIDE TO THE MAJOR PORTION OF TSHE ISOLATION CHANNELS TO PRODUCE THE FULLY ISOLATED ISLANDS OF SEMICONDUCTOR MATERIAL IN THE SEMICONDUCTOR SUBSTRATE.
Abstract:
An information card for credit and accounting system having a monolithic or solid state memory for storage of information responsive to computer controlled systems.
Abstract:
A SEMICONDUCTIVE DEVICE AND A METHOD FOR FORMING A SEMICONDUCTOR DEVICE WHEREIN THE OHMIC CONTACT IS IN THE ORDER OF MICRONS IN WIDTH. A FIRST METAL IS FORMED IN THE OPENING IN THE PROTECTIVE COATING WHICH ACTS AS THE OHMIC CONTACT TO THE SEMICONDUCTOR DEVICE. A SECOND METAL MAY BE APPLIED ONLY OVER THE FIRST METAL BY ELECTROLESS OR ELECTROPLATING TECHNIQUES TO INCREASE THE CONDUCTIVITY OF THE OHMIC CONTACT. FINALLY, AN EXTERNAL LAND METAL LAYER IS DEPOSITED OVER A RELATIVELY LARGE AREA OF THE PROTECTIVE COATING IN THE AREA OF THE OHMIC CONTACT WITH FINGER-LIKE EXTENSIONS OF THE LAND METAL LAYER CONTACTING THE OHMIC CONTACT BY SHORT OVERLAID AREAS. THE EXTERNAL LAND IS THE ONLY METAL LAYER IN THE PROCESS FORMED WHICH REQUIRES A PHOTOGRAPHIC MASK. THE PROCESS, THEREFORE, IN NOT LIMITED BY PRESENT DAY PHOTOENGRAVING TECHNIQUES.
Abstract:
A planar integrated semiconductor circuit having common emitter transistor elements isolated from each other and from other transistors by the emitter regions which form a PN or rectifying junction with the body of the semiconductor member in which the integrated circuit is formed. In a semiconductor member or body of one type conductivity, a plurality of emitter regions of opposite type conductivity extend from one planar surface of the body. One or more of the emitter regions each have a plurality of discrete base regions of the one type conductivity extending from said planar surface fully enclosed within the emitter region. Each of the base regions in turn has at least one collector region enclosed within it at the planar surface. The emitter region has a higher majority carrier concentration than the majority carrier concentration within its enclosed base regions. The rectifying junction formed by the opposite conductivity emitter region with the one type conductivity semiconductor body serves to isolate the emitter regions from each other.
Abstract:
A planar integrated semiconductor circuit having common emitter transistor elements isolated from each other and from other transistors by the emitter regions which form a PN- or rectifying junction with the body of the semiconductor member in which the integrated circuit is formed. In a semiconductor member or body of one type conductivity, a plurality of emitter regions of opposite type conductivity extend from one planar surface of the body. One or more of the emitter regions each have a plurality of discrete base regions of the one type conductivity extending from said planar surface fully enclosed within the emitter region. Each of the base regions in turn has at least one collector region enclosed within it at the planar surface. The emitter region has a higher majority carrier concentration than the majority carrier concentration within its enclosed base regions. The rectifying junction formed by the opposite conductivity emitter region with the one type conductivity semiconductor body serves to isolate the emitter regions from each other.