Multi-layer interconnect structure for stacked dies
First Claim
1. A semiconductor device comprising:
- a first substrate;
a through-substrate via comprising a single continuous structure extending from a first side of the first substrate through the first substrate and protruding from a second side of the first substrate by a first distance, the through-substrate via electrically coupled to an electrical device disposed on the first side of the first substrate;
a first isolation film on the second side of the first substrate, the first isolation film having a thickness less than the first distance, wherein the through-substrate via is exposed above the first isolation film;
a first conductive element on the through-substrate via, the first conductive element extending over the first isolation film;
a second isolation film on the first isolation film and the first conductive element; and
a second conductive element electrically coupled to the first conductive element and extending over an upper surface of the second isolation film.
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Abstract
A multi-layer interconnect structure for stacked die configurations is provided. Through-substrate vias are formed in a semiconductor substrate. A backside of the semiconductor substrate is thinned to expose the through-substrate vias. An isolation film is formed over the backside of the semiconductor substrate and the exposed portion of the through-substrate vias. A first conductive element is formed electrically coupled to respective ones of the through-substrate vias and extending over the isolation film. One or more additional layers of isolation films and conductive elements may be formed, with connection elements such as solder balls being electrically coupled to the uppermost conductive elements.
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Citations
20 Claims
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1. A semiconductor device comprising:
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a first substrate; a through-substrate via comprising a single continuous structure extending from a first side of the first substrate through the first substrate and protruding from a second side of the first substrate by a first distance, the through-substrate via electrically coupled to an electrical device disposed on the first side of the first substrate; a first isolation film on the second side of the first substrate, the first isolation film having a thickness less than the first distance, wherein the through-substrate via is exposed above the first isolation film; a first conductive element on the through-substrate via, the first conductive element extending over the first isolation film; a second isolation film on the first isolation film and the first conductive element; and a second conductive element electrically coupled to the first conductive element and extending over an upper surface of the second isolation film. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor device comprising:
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through-substrate vias extending through a first substrate and in electrical contact with an electrical device on a frontside of the first substrate, the through-substrate vias protruding from a backside of the first substrate by a first distance; a first isolation film on the backside of the first substrate between adjacent ones of the through-substrate vias, the first isolation film having a thickness less than the first distance; liners disposed in the first substrate, each one of the liners in contact with respective ones of the through-substrate vias, the liners extending above a lower surface of the first isolation film; first conductive elements being in electrical contact with respective ones of the through-substrate vias and extending over the first isolation film; a second isolation film over the first conductive elements; and second conductive elements being in electrical contact with respective ones of the first conductive elements and extending over the second isolation film. - View Dependent Claims (8, 9, 10, 11)
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12. A semiconductor device comprising:
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a substrate having one or more through-substrate vias extending from a circuit-side to a backside of the substrate, wherein the backside of the substrate is recessed such that the through-substrate vias protrude from the backside of the substrate; a first redistribution layer comprising; a first isolation film over the backside of the substrate; and first conductive elements electrically coupled to respective ones of the one or more through-substrate vias, respective ones of the one or more through-substrate vias extending above a lower surface of respective ones of the first conductive elements, the first conductive elements extending over an upper surface of the first isolation film; and one or more additional redistribution layers, each additional redistribution layer comprising; an additional isolation film over an uppermost isolation film; and additional conductive elements electrically coupled to respective ones of the underlying conductive elements, the additional conductive elements extending over an upper surface of the respective additional isolation film. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification