Fine-scale interconnect with micro-air bridge
First Claim
Patent Images
1. An interconnect on a substrate comprising:
- a first section comprising a first stalk segment on the substrate and a first cap segment coupled to a distal end of the first stalk segment, away from the substrate, the first stalk segment having a first width and the first cap segment having a second width, the first width narrower than the second width along a lateral direction parallel to a surface of the substrate;
a second section comprising a second cap segment laterally displaced from the first cap segment along the lateral direction and connected to the first cap segment at a first end of the second cap segment; and
a third section comprising a second stalk segment on the substrate and a third cap segment coupled to a distal end of the second stalk segment, away from the substrate, one end of the third cap segment laterally displaced from the second cap segment along the lateral direction and connected to a second end of the second cap segment, the second stalk segment having the first width and the third cap segment having the second width;
wherein the second cap segment is suspended between the first cap segment and the third cap segment with a layer of air separating the second cap segment from the substrate.
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Abstract
Structures of and methods for fabricating fine-scale interconnects are disclosed. A “mushroom”-type structure with a narrow stalk supporting a wider cap can be used for fine-scale interconnects with widths on the scale of hundreds of nanometers that have low resistivity. Micro-air bridges can be introduced by omitting the stalk in sections of the interconnect, allowing the interconnect to bridge over obstacles.
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Citations
13 Claims
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1. An interconnect on a substrate comprising:
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a first section comprising a first stalk segment on the substrate and a first cap segment coupled to a distal end of the first stalk segment, away from the substrate, the first stalk segment having a first width and the first cap segment having a second width, the first width narrower than the second width along a lateral direction parallel to a surface of the substrate; a second section comprising a second cap segment laterally displaced from the first cap segment along the lateral direction and connected to the first cap segment at a first end of the second cap segment; and a third section comprising a second stalk segment on the substrate and a third cap segment coupled to a distal end of the second stalk segment, away from the substrate, one end of the third cap segment laterally displaced from the second cap segment along the lateral direction and connected to a second end of the second cap segment, the second stalk segment having the first width and the third cap segment having the second width; wherein the second cap segment is suspended between the first cap segment and the third cap segment with a layer of air separating the second cap segment from the substrate. - View Dependent Claims (2, 3, 4, 5, 9, 10, 11)
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6. A circuit comprising:
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a first electrical contact on a substrate; a second electrical contact on the substrate; a third electrical contact on the substrate between the first electrical contact and the second electrical contact; and an interconnect connecting the first electrical contact and the second electrical contact and electrically isolated from the third electrical contact, the interconnect comprising; a first section comprising a first stalk segment on the substrate and a first cap segment coupled to a distal end of the first stalk segment, away from the substrate, the first stalk segment having a first width and the first cap segment having a second width, the first width narrower than the second width along a lateral direction parallel to a surface of the substrate; a second section comprising a second cap segment laterally displaced from the first cap segment along the lateral direction and connected to the first cap segment at a first end of the second cap segment, the second section overlapping the third electrical contact; and a third section comprising a second stalk segment on the substrate and a third cap segment coupled to a distal end the second stalk segment, one end of the third cap segment laterally displaced from the second cap segment along the lateral direction and connected to a second end of the second cap segment, the second stalk segment having the first width and the third cap segment having the second width, wherein the second cap segment is suspended between the first cap segment and the third cap segment with a layer of air separating the second cap segment from the third electrical contact and the substrate. - View Dependent Claims (7, 8, 12, 13)
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Specification