Flash memory cell and methods for programming and erasing
First Claim
1. A flash memory cell, comprising:
- a source formed in a substrate;
a drain formed in the substrate, the source and the drain being spaced from one another on laterally opposite sides of a channel region of the substrate;
a dielectric material formed above the channel region of the substrate;
a charge trapping material formed over the dielectric material; and
a control gate formed over the charge trapping material, wherein the control gate is located directly on the charge trapping material and the electrons are directed from the control gate directly into the charge trapping material without traveling through an intermediary layer.
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Accused Products
Abstract
Flash memory cells are presented which comprise a dielectric material formed above a substrate channel region, a charge trapping material formed over the dielectric material, and a control gate formed over the charge trapping material. The cell may be programmed by directing electrons from the control gate into the charge trapping material to raise the cell threshold voltage. The electrons may be directed from the control gate to the charge trapping material by coupling a substrate to a substrate voltage potential, and coupling the control gate to a gate voltage potential, where the gate voltage potential is lower than the substrate voltage potential. The cell may be erased by directing electrons from the charge trapping material into the control gate to lower a threshold voltage of the flash memory cell, such as by coupling the substrate to a substrate voltage potential, and coupling the control gate to a gate voltage potential, where the gate voltage potential is higher than the substrate voltage potential.
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Citations
20 Claims
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1. A flash memory cell, comprising:
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a source formed in a substrate;
a drain formed in the substrate, the source and the drain being spaced from one another on laterally opposite sides of a channel region of the substrate;
a dielectric material formed above the channel region of the substrate;
a charge trapping material formed over the dielectric material; and
a control gate formed over the charge trapping material, wherein the control gate is located directly on the charge trapping material and the electrons are directed from the control gate directly into the charge trapping material without traveling through an intermediary layer. - View Dependent Claims (2, 3, 4)
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5. A gate structure for a flash memory cell, the gate structure comprising:
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a dielectric material formed above a channel region of a substrate;
a charge trapping material formed over the dielectric material; and
a control gate formed over the charge trapping material, wherein the control gate is located directly on the charge trapping material and the electrons are directed from the control gate directly into the charge trapping material without traveling through an intermediary layer. - View Dependent Claims (6, 7, 8)
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9. A memory device comprising:
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a core region of the device comprising a plurality of flash memory cells respectively comprising;
a source formed in a substrate;
a drain formed in the substrate, the source and the drain being spaced from one another on laterally opposite sides of a channel region of the substrate;
a dielectric material formed above the channel region of the substrate;
a charge trapping material formed over the dielectric material; and
a control gate formed over the charge trapping material, wherein the control gate is located directly on the charge trapping material and the electrons are directed from the control gate directly into the charge trapping material without traveling through an intermediary layer; and
a peripheral region of the device comprising I/O circuitry and programming circuitry. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A communication device comprising:
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communication circuitry;
a flash memory device comprising;
flash memory cells respectively comprising;
a source formed in a substrate;
a drain formed in the substrate, the source and the drain being spaced from one another on laterally opposite sides of a channel region of the substrate;
a dielectric material formed above the channel region of the substrate;
a charge trapping material formed over the dielectric material; and
a control gate formed over the charge trapping material, wherein the control gate is located directly on the charge trapping material and the electrons are directed from the control gate directly into the charge trapping material without traveling through an intermediary layer;
programming circuitry; and
I/O circuitry coupled to the communication circuitry. - View Dependent Claims (18, 19, 20)
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Specification