Hot carrier injection programmable structure including discontinuous storage elements and spacer control gates in a trench and a method of using the same
First Claim
1. An array of storage cells wherein at least one of the storage cells comprises:
- a semiconductor substrate including an uppermost surface and a first trench extending from the uppermost surface;
a first diffusion region underlying a portion of a first trench defined in the semiconductor substrate wherein a conductivity type of the first diffusion region is opposite a conductivity type of the semiconductor substrate;
a second diffusion region occupying an upper portion of the semiconductor substrate adjacent to the first trench wherein a conductivity type of the second diffusion region is opposite the conductivity type of the semiconductor substrate;
a charge storage stack lining sidewalls and a portion of a floor of the first trench wherein the charge storage stack includes a layer of discontinuous storage elements (DSEs); and
electrically conductive spacers formed on sidewalls of the first trench adjacent to respective charge storage stacks, wherein substantially all of the electrically conductive spacers lie at elevations between an uppermost surface of the semiconductor substrate and a bottom of the trench.
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Accused Products
Abstract
A programmable storage device includes a first diffusion region underlying a portion of a first trench defined in a semiconductor substrate and a second diffusion region occupying an upper portion of the substrate adjacent to the first trench. The device includes a charge storage stack lining sidewalls and a portion of a floor of the first trench. The charge storage stack includes a layer of discontinuous storage elements (DSEs). Electrically conductive spacers formed on opposing sidewalls of the first trench adjacent to respective charge storage stacks serve as control gates for the device. The DSEs may be silicon, polysilicon, metal, silicon nitride, or metal nitride nanocrystals or nanoclusters. The storage stack includes a top dielectric of CVD silicon oxide overlying the nanocrystals overlying a bottom dielectric of thermally formed silicon dioxide. The device includes first and second injection regions in the layer of DSEs proximal to the first and second diffusion regions.
103 Citations
20 Claims
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1. An array of storage cells wherein at least one of the storage cells comprises:
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a semiconductor substrate including an uppermost surface and a first trench extending from the uppermost surface; a first diffusion region underlying a portion of a first trench defined in the semiconductor substrate wherein a conductivity type of the first diffusion region is opposite a conductivity type of the semiconductor substrate; a second diffusion region occupying an upper portion of the semiconductor substrate adjacent to the first trench wherein a conductivity type of the second diffusion region is opposite the conductivity type of the semiconductor substrate; a charge storage stack lining sidewalls and a portion of a floor of the first trench wherein the charge storage stack includes a layer of discontinuous storage elements (DSEs); and electrically conductive spacers formed on sidewalls of the first trench adjacent to respective charge storage stacks, wherein substantially all of the electrically conductive spacers lie at elevations between an uppermost surface of the semiconductor substrate and a bottom of the trench. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification