Multiple fin formation
First Claim
1. A method for forming a FinFET, comprising:
- providing a semiconductor layer;
forming a first layer of a first material over the semiconductor layer;
patterning the first layer to form a patterned feature having a pair of sidewalls;
forming a pair of first sidewall spacers of a second material adjacent to the pair of sidewalls of the patterned feature;
forming a pair of second sidewall spacers of a third material that is a different type from the second material, wherein the pair of second sidewall spacers are adjacent to the pair of first sidewall spacers;
removing the pair of first sidewall spacers;
after removing the pair of first sidewall spacers, etching the semiconductor layer using the pair of second sidewall spacers and the patterned feature as a mask to leave semiconductor fins patterned as per the pair of second sidewall spacers and the patterned feature; and
wherein channels of the FinFET are implemented in the semiconductor fins.
23 Assignments
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Accused Products
Abstract
A FinFET includes a plurality of semiconductor fins. Over a semiconductor layer, patterned features (e.g. of minimum photolithographic size and spacing) are formed. In one example of fin formation, a first set of sidewall spacers are formed adjacent to the sides of these patterned features. A second set of sidewall spacers of a different material are formed adjacent to the sides of the first set of sidewall spacers. The first set of sidewall spacers are removed leaving the second set of sidewall spacers spaced from the patterned features. Both the second set of sidewall spacers and the patterned features are used as a mask to an etch that leaves semiconductor fins patterned as per the second set of sidewall spacers and the patterned features. These resulting semiconductor fins, which have sub-lithographic spacings, are then used for channels of a FinFET transistor.
264 Citations
20 Claims
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1. A method for forming a FinFET, comprising:
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providing a semiconductor layer;
forming a first layer of a first material over the semiconductor layer;
patterning the first layer to form a patterned feature having a pair of sidewalls;
forming a pair of first sidewall spacers of a second material adjacent to the pair of sidewalls of the patterned feature;
forming a pair of second sidewall spacers of a third material that is a different type from the second material, wherein the pair of second sidewall spacers are adjacent to the pair of first sidewall spacers;
removing the pair of first sidewall spacers;
after removing the pair of first sidewall spacers, etching the semiconductor layer using the pair of second sidewall spacers and the patterned feature as a mask to leave semiconductor fins patterned as per the pair of second sidewall spacers and the patterned feature; and
wherein channels of the FinFET are implemented in the semiconductor fins. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16)
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11. A method for forming a FinFET, comprising:
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providing a semiconductor device structure including a substrate layer and a semiconductor layer over the substrate layer;
forming a first layer of a first material over the semiconductor layer;
providing a second layer of a second material over the first layer;
patterning the second layer to form a patterned feature having a first sidewall and a second sidewall;
forming a first sidewall spacer adjacent to the first sidewall and a second sidewall spacer adjacent to the second sidewall, wherein the first and second sidewall spacers are of a third material;
forming a third sidewall spacer adjacent to the first sidewall spacer and a fourth sidewall spacer adjacent to the second sidewall spacer, wherein the third and fourth sidewall spacers are of a fourth material;
removing the first and second sidewall spacers;
trimming the patterned feature using an isotropic etch;
etching the semiconductor layer to leave semiconductor fins patterned as per the third and fourth sidewall spacers and the patterned feature;
wherein channels of the FinFET are implemented in the semiconductor fins. - View Dependent Claims (12, 13, 14, 15, 17)
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18. A method for forming a FinFET, comprising:
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providing a semiconductor layer;
forming a first layer of a first material over the semiconductor layer;
patterning the first layer to form a patterned feature having a first sidewall;
forming a first sidewall spacer of a second material adjacent to the first sidewall;
forming a second sidewall spacer of a third material adjacent to the first sidewall spacer;
removing the first sidewall spacer;
etching the semiconductor layer using the second sidewall spacer and the patterned feature as a mask to form a first fin as per the first patterned feature and a second fin as per the second sidewall spacer; and
wherein a first channel of the FinFET is implemented in the first fin and a second channel of the FinFET is implemented in the second fin. - View Dependent Claims (19, 20)
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Specification