摘要:
A semiconductor device of improved ruggedness is provided which comprises a semiconductor substrate having a region of a first conductivity type on a major surface thereof; a first base region of opposite conductivity type formed selectively within said regions of first conductivity type; a second base region of opposite conductivity type formed selectively within said first base region and having a higher impurity concentration than that of said first base region; a source region of one conductivity type formed within said first and second base regions and overlying said second base region; and a polysilicon gate electrode opposed to a channel region with a gate insulating layer interposed therebetween; wherein the second base region and the source region are formed substantially entirely within the first base region; the second base region is smaller in depth than the first base region and is formed at a distance sufficiently close to the channel region to effectively reduce parasitic resistance in the first base region, the lateral edges of the second base region being substantially aligned with the lateral edges of the gate electrode; the first base region and the source region are formed by sequential implantation through the polysilicon gate electrode region using the polysilicon gate electrode as a self-aligned mask, followed by implantation of the second base region without substantial lateral diffusion using the polysilicon gate electrode as a mask; and the polysilicon gate electrode is of a thickness sufficient to mask for selected depths of implantation in the first base region.
摘要:
A semiconductor device of improved ruggedness is provided which comprises a semiconductor substrate having a region of a first conductivity type on a major surface thereof; a first base region of opposite conductivity type formed selectively within said regions of first conductivity type; a second base region of opposite conductivity type formed selectively within said first base region and having a higher impurity concentration than that of said first base region; a source region of one conductivity type formed within said first and second base regions and overlying said second base region; and a polysilicon gate electrode opposed to a channel region with a gate insulating layer interposed therebetween; wherein the second base region and the source region are formed substantially entirely within the first base region; the second base region is smaller in depth than the first base region and is formed at a distance sufficiently close to the channel region to effectively reduce parasitic resistance in the first base region, the lateral edges of the second base region being substantially aligned with the lateral edges of the gate electrode; the first base region and the source region are formed by sequential implantation through the polysilicon gate electrode region using edges of the polysilicon gate electrode as a self-aligned mask, followed by implantation of the second base region without substantial lateral diffusion using the polysilicon gate electrode as a mask; and the polysilicon gate electrode is of a thickness sufficient to mask for selected depths of implantation in the first base region.
摘要:
A method is set forth for forming a plurality of SOI transistors in a pattern beneath planarized reflective surfaces of a reflective display. This enables the formation of information pixels useful in devices, such as reflective LCD devices. A specific technique of providing the SOI transistors is set forth.
摘要:
A metal for fabricating contact structures through via openings in VLSI circuits employs a dual layer of refractory metal. A thin titanium layer is deposited, over which a molybdenum layer is formed. An annealing treatment further improves contact resistance characteristics. The method results in a contact structure which exhibits desirable properties of thermal compatibility, step coverage, contact resistance and improved processing characteristics.
摘要:
A technique for making a microwave, high power SOI-MOFET device is set forth together with such a device. An important aspect of this structure is the presence of high conductivity metal gate fingers for the device.
摘要:
A conductive member consisting of a first conductor of an alloy of titanium and tungsten and a second conductor of a refractory metal such as molybdenum is sintered to a conductive member of silicon of low resistivity to form a low resistance contact therewith.
摘要:
Molybdenum gate electrode material is provided with an upper layer of molybdenum nitride which acts to prevent deposition of source and drain contact metal by selective chemical vapor deposition (CVD). The nitride layer also provides an improved mask for ion implantation process steps. This results in an FET structure exhibiting a high degree of planarity which is desirable for multilevel device fabrication.
摘要:
A process is set forth for providing a self-aligned, vertical bipolar transistor. A controlled technique is provided for providing the base and emitter features of the transistor with appropriate dimensions and properties to be useful in high frequency microwave applications. A microwave transistor is provided by this technique.
摘要:
A composite conductive structure which includes an insulating substrate on which is provided a conductor of molybdenum covered by a layer of molybdenum nitride and a method of making the structure are described. The method includes heating the conductor of molybdenum in an atmosphere of ammonia in the range from about 400.degree. C. to 850.degree. C. for a time to cause the atmosphere to react with the conductor to convert a portion of the conductor into molybdenum nitride.
摘要:
A vertical double diffused metal-on-semiconductor device is produced by a method involving the formation of horizontally separated bodies of heavily doped Si and sources by a self-aligned process and a lift-off process along with the formation of trenches having negatively-sloped side-walls.