Method of vertically integrating microelectronic systems
First Claim
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1. A method of vertically integrating microelectronic systems, comprising the steps of:
- providing a first substrate comprising a first side which in an area of a first major surface comprises at least one first layer containing circuit structures and at least one first metallized metallization level;
opening in the area of said first major surface a plurality of via holes of a depth sufficient for penetrating said at least one first circuit structure containing layer;
providing a second substrate comprising a side which in an area of a second major surface comprises at least one second layer containing circuit structures and at least one second metallized metallization level;
connecting said first substrate to said second substrate by putting together said side of said first major surface and said side of said second major surface in aligned relationship, thereby to provide a stack of substrates;
thinning the stack of substrates at a side of said first substrate opposite said first side for opening said via holes therein;
increasing said depth of said via holes down to the metallization of said metallization level of said second substrate; and
providing means extending through said via holes for forming an electrically conductive connection between said metallization of said first and said metallization of said second metallization level.
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Abstract
A method of fabricating vertically integrated microelectronic systems by CMOS-compatible standard semiconductor process technology, by independently processing individual component layers of at least two separate substrates, including the formation of via holes penetrating through all existing component layers and connecting together the front surfaces of the two substrates, thinning the reverse surface of one of the substrates down to the via holes, increasing the depth of the via holes to a metallization plane of the other substrate and forming electrically conductive connections between the two substrates through the via holes.
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20 Claims
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1. A method of vertically integrating microelectronic systems, comprising the steps of:
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providing a first substrate comprising a first side which in an area of a first major surface comprises at least one first layer containing circuit structures and at least one first metallized metallization level; opening in the area of said first major surface a plurality of via holes of a depth sufficient for penetrating said at least one first circuit structure containing layer; providing a second substrate comprising a side which in an area of a second major surface comprises at least one second layer containing circuit structures and at least one second metallized metallization level; connecting said first substrate to said second substrate by putting together said side of said first major surface and said side of said second major surface in aligned relationship, thereby to provide a stack of substrates; thinning the stack of substrates at a side of said first substrate opposite said first side for opening said via holes therein; increasing said depth of said via holes down to the metallization of said metallization level of said second substrate; and providing means extending through said via holes for forming an electrically conductive connection between said metallization of said first and said metallization of said second metallization level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification