CARBON NANOTUBE INTERCONNECT STRUCTURE, AND METHOD OF MANUFACTURING THE SAME
First Claim
1. A carbon nanotube interconnect structure comprising:
- a first interconnect layer;
a first interlayer insulating film on the first interconnect layer;
a second interlayer insulating film on the first interlayer insulating film;
a contact hole penetrating through the first interlayer insulating film and the second interlayer insulating film;
a catalyst metal film on a portion of the first interconnect layer located at a lower end of the contact hole;
a second interconnect layer on the second interlayer insulating film; and
carbon nanotubes on the catalyst metal film located in the contact hole, the carbon nanotubes electrically connecting the first interconnect layer and the second interconnect layer,whereinA and B satisfy B/A>
1.5, andL and a satisfy L/a≧
2,where L represents a length of the contact hole,A represents an opening area at an upper end of the contact hole,a represents an opening diameter at the upper end of the contact hole, andB represents an opening area at the lower end of the contact hole.
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Abstract
A carbon nanotube interconnect structure of an embodiment has a first interconnect layer, a first interlayer insulating film on the first interconnect layer, a second interlayer insulating film on the first interlayer insulating film, a contact hole penetrating through the first interlayer insulating film and the second interlayer insulating film, a catalyst metal film on a portion of the first interconnect layer located at a lower end of the contact hole, a second interconnect layer on the second interlayer insulating film, and carbon nanotubes on the catalyst metal film located in the contact hole. The carbon nanotubes electrically connecting the first interconnect layer and the second interconnect layer.
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Citations
15 Claims
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1. A carbon nanotube interconnect structure comprising:
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a first interconnect layer; a first interlayer insulating film on the first interconnect layer; a second interlayer insulating film on the first interlayer insulating film; a contact hole penetrating through the first interlayer insulating film and the second interlayer insulating film; a catalyst metal film on a portion of the first interconnect layer located at a lower end of the contact hole; a second interconnect layer on the second interlayer insulating film; and carbon nanotubes on the catalyst metal film located in the contact hole, the carbon nanotubes electrically connecting the first interconnect layer and the second interconnect layer, wherein A and B satisfy B/A>
1.5, andL and a satisfy L/a≧
2,where L represents a length of the contact hole, A represents an opening area at an upper end of the contact hole, a represents an opening diameter at the upper end of the contact hole, and B represents an opening area at the lower end of the contact hole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of manufacturing a carbon nanotube interconnect structure, comprising:
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forming a first interconnect layer; forming a first interlayer insulating film on the first interconnect layer; forming a second interlayer insulating film on the first interlayer insulating film; forming a contact hole penetrating through the first interlayer insulating film and the second interlayer insulating film by performing etching on the first interlayer insulating film and the second interlayer insulating film; further performing etching on the first interlayer insulating film, to form a larger opening area than an upper end portion of the contact hole; forming a catalyst metal film in the contact hole; forming carbon nanotubes on the catalyst metal film; planarizing the carbon nanotubes; and forming a second interconnect layer on the planarized carbon nanotubes and the second interlayer insulating film. - View Dependent Claims (11, 12)
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13. A method of manufacturing a carbon nanotube interconnect structure, comprising:
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forming a first interconnect layer; forming a catalyst metal film on the first interconnect layer; forming a first interlayer insulating film on the catalyst metal film; forming a second interlayer insulating film on the first interlayer insulating film; forming a contact hole penetrating through the first interlayer insulating film and the second interlayer insulating film by performing etching on the first interlayer insulating film and the second interlayer insulating film; further performing etching on the first interlayer insulating film, to form a larger opening area than an upper end portion of the contact hole; forming carbon nanotubes on the catalyst metal film; planarizing the carbon nanotubes; and forming a second interconnect layer on the planarized carbon nanotubes and the second interlayer insulating film. - View Dependent Claims (14, 15)
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Specification