SEMICONDUCTOR MEMORY DEVICE AND METHOD OF MANUFACTURING THE SAME
First Claim
1. A semiconductor memory device comprising:
- a semiconductor substrate;
isolation layers formed in a surface of the semiconductor substrate, and separating the semiconductor substrate into active areas, the isolation layers and the active areas being alternately arranged along a predetermined direction parallel to the surface of the semiconductor substrate, a height of upper surfaces of the isolation layers being lower than a height of an upper surface of the semiconductor substrate;
diffusion layers formed on surfaces of the active areas; and
a stress liner formed on upper surfaces and side surfaces of the diffusion layers, and formed of a material having a lattice constant smaller than a lattice constant of a material formed of the semiconductor substrate.
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Accused Products
Abstract
In one embodiment, a semiconductor memory device includes a semiconductor substrate, and isolation layers formed in a surface of the semiconductor substrate, and separating the semiconductor substrate into active areas, the isolation layers and the active areas being alternately arranged along a predetermined direction parallel to the surface of the semiconductor substrate, a height of upper surfaces of the isolation layers being lower than a height of an upper surface of the semiconductor substrate. The device further includes diffusion layers formed on surfaces of the active areas, and a stress liner formed on upper surfaces and side surfaces of the diffusion layers, and formed of a material having a lattice constant smaller than a lattice constant of a material formed of the semiconductor substrate.
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Citations
18 Claims
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1. A semiconductor memory device comprising:
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a semiconductor substrate; isolation layers formed in a surface of the semiconductor substrate, and separating the semiconductor substrate into active areas, the isolation layers and the active areas being alternately arranged along a predetermined direction parallel to the surface of the semiconductor substrate, a height of upper surfaces of the isolation layers being lower than a height of an upper surface of the semiconductor substrate; diffusion layers formed on surfaces of the active areas; and a stress liner formed on upper surfaces and side surfaces of the diffusion layers, and formed of a material having a lattice constant smaller than a lattice constant of a material formed of the semiconductor substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of manufacturing a semiconductor memory device, the method comprising:
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forming isolation layers on a surface of a semiconductor substrate to separate the substrate into active areas, the isolation layers and the active areas being arranged along a predetermined direction parallel to the surface of the semiconductor substrate; forming diffusion layers on surfaces of the active areas; forming a stress liner on upper surfaces of the diffusion layers, the stress liner being formed of a material having a lattice constant smaller than a lattice constant of a material formed of the semiconductor substrate; and annealing the diffusion layers after the stress liner is formed. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A semiconductor memory device comprising:
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a semiconductor substrate; isolation layers formed in a surface of the semiconductor substrate, and separating the semiconductor substrate into active areas, the isolation layers and the active areas being alternately arranged along a first direction parallel to the surface of the semiconductor substrate, and extending in a second direction perpendicular to the first direction, a height of upper surfaces of the isolation layers being lower than a height of an upper surface of the semiconductor substrate; memory strings, each of the memory strings comprising; cell transistors formed on one of the active areas along to the second direction, and first and second select transistors formed on the active area and arranged to sandwich the cell transistors; diffusion layers formed in surfaces of the active areas between the memory strings; a stress liner formed on upper surfaces and side surfaces of the diffusion layers, and formed of a material having a lattice constant smaller than a lattice constant of a material formed of the semiconductor substrate; and insulators buried between the cell transistors and between the cell transistors and the select transistors, a compression stress of the insulators to the material formed of the substrate being smaller than a compression stress of the stress liner to the material formed of the substrate. - View Dependent Claims (15, 16, 17, 18)
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Specification