Integrated circuit device, system, and method of fabrication

Abstract

A semiconductor device, comprising a first semiconductor portion having a first end, a second end, and a slit portion, wherein the width of the slit portion is less than the width of at least one of the first end and the second end; a second portion that is a different material than the first semiconductor portion, a third portions that is a different material than the first semiconductor portion, wherein the second and third portions are on opposite sides of the slit portion, and at least three terminals selected from a group consisting of a first terminal connected to the first end, a second terminal connected to the second end, a third terminal connected to the second portion, and a fourth terminal connected to the third portion.

Description

FIELD OF THE INVENTION[0001]The present invention is directed generally to integrated circuits and, more specifically, to methods of fabricating integrated circuits, devices and systems for fabricating integrated circuits and other devices and systems, and devices and systems which are formed by, or which utilize, components or other parts which are formed by or in accordance with the present invention.BACKGROUND OF THE INVENTION[0002]The fabrication of integrated circuits is typically done by building successive layers on top of each other. These layers are built on or in an underlying substrate, such as single crystal silicon or an electrical insulator. When the substrate is an electrical insulator, such as sapphire, the fabrication techniques and resulting devices are often referred to as “silicon on insulator” or “semiconductor on insulator”, which are collectively called “SOI”.[0003]Many process steps are typically involved in semiconductor fabrication including deposition, oxi...

AI Technical Summary

Benefits of technology

[0009]It has been found that new methods, devices, and systems of fabrication are possible. These new methods, devices, and systems overcome many of the problems inherent in the prior art. For example, the present invention offers advantages over the prior art, such as compact size and the potential of repetitive pattern design.

[0024]In one embodiment, the present invention forms features in a regular, repeating pattern. These patterns may be formed, for example, with conventional fabrication techniques, such as by using a lithographic mask to form a pattern in a layer of photoresist and etching the exposed surface. The use of a regular, repeating pattern offers several advantages, including a relatively simple lithographic mask, the reduction or elimination of optical proximity correction (“OPC”) during fabrication, and increased throughput.

Problems solved by technology

In general, shorter wavelengths provide better resolution but are more expensive to implement and they create other problems.

Furthermore, physical limitations are presenting problems for the continued reduction in wavelengths in lithography.

Furthermore, the costs of lithography and other fabrication processes and tools have increased dramatically, and the research and development required for significant advances in various technologies will add to the costs.

There are also other problems with prior art integrated circuit technology.

For example, the design processes, the lithographic masks, and the lithographic processes involved in prior art integrated circuit design and fabrication are complex and expensive.

In addition, the utilization of integrated circuit area by active devices is relatively low.

As a result, prior art integrated circuit designs and processes are expensive and result in inefficient utilization of resources.

Those devices suffer a significant voltage drop between the controlling gate and the bulk semiconductor region as a result of charge in the charge storage gate that represents the memory value.

This problem is due to the stacking of a controlling gate and a charge storage gate in series with each other and above the bulk semiconductor region.

The ONO layer is difficult to fabricate because it is between two polysilicon layers that form the controlling and charge storage gates.

Finally, this structure of conventional flash memory devices also suffers from difficulties in the charging and discharging of the device.

In particular, the voltage drop from the controlling gate through the stored charge is significant and requires higher controlling gate voltages to affect the channel in the bulk semiconductor region.

Images