Method and structure for mandrel and spacer patterning
First Claim
1. A semiconductor device, comprising:
- a first active fin on a substrate;
a second active fin on the substrate and separate from the first active fin;
a first fin stub on the substrate, wherein the first fin stub connects a bottom portion of the first active fin and a bottom portion of the second active fin, wherein the first fin stub is lower than both the first and the second active fins in height; and
an isolation feature over the first fin stub and between the first and second active fins, wherein the isolation feature is higher than the first fin stub and lower than both the first and the second active fins in height, wherein from a top view the first active fin is oriented lengthwise in a first direction, and the first fin stub is oriented lengthwise in a second direction that is different from the first direction.
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Accused Products
Abstract
A semiconductor device includes a first active fin on a substrate; a second active fin on the substrate and separate from the first active fin; a first fin stub on the substrate, wherein the first fin stub connects a bottom portion of the first active fin and a bottom portion of the second active fin; and an isolation feature over the first fin stub and between the first and second active fins. The first fin stub is lower than both the first and the second active fins in height. The isolation feature is higher than the first fin stub and lower than both the first and the second active fins in height. From a top view, the first active fin is oriented lengthwise in a first direction, and the first fin stub is oriented lengthwise in a second direction that is different from the first direction.
43 Citations
20 Claims
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1. A semiconductor device, comprising:
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a first active fin on a substrate; a second active fin on the substrate and separate from the first active fin; a first fin stub on the substrate, wherein the first fin stub connects a bottom portion of the first active fin and a bottom portion of the second active fin, wherein the first fin stub is lower than both the first and the second active fins in height; and an isolation feature over the first fin stub and between the first and second active fins, wherein the isolation feature is higher than the first fin stub and lower than both the first and the second active fins in height, wherein from a top view the first active fin is oriented lengthwise in a first direction, and the first fin stub is oriented lengthwise in a second direction that is different from the first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor device, comprising:
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a first fin on a substrate, wherein the first fin provides source, drain, and channel regions for a first field effect transistor (FET); a second fin on the substrate, wherein the second fin provides source, drain, and channel regions for a second FET; a first fin stub on the substrate, wherein the first fin stub connects a bottom portion of the first fin and a bottom portion of the second fin; and an isolation feature over the first fin stub and between the first and second fins, wherein a top surface of the isolation feature is above a top surface of the first fin stub and is below top surfaces of the first and second fins, wherein from a top view, the first and second fins are oriented lengthwise in a first direction, and the first fin stub is oriented lengthwise in a second direction that is different from the first direction. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A semiconductor device, comprising:
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first fins on a substrate, oriented lengthwise generally along a first direction, and spaced from each other with a first fin pitch along a second direction perpendicular to the first direction; second fins on the substrate, oriented lengthwise generally along the first direction, and spaced from each other with a second fin pitch along the second direction, wherein the second fin pitch is smaller than the first fin pitch; a first fin stub on the substrate, wherein the first fin stub connects a bottom portion of one of the first fins and a bottom portion of one of the second fins, wherein the first fin stub is oriented lengthwise along a third direction that is different from the first and second directions; and an isolation feature covering the first fin stub, wherein a top surface of the isolation feature is lower than top surfaces of the first and second fins. - View Dependent Claims (18, 19, 20)
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Specification