Patent ID: 6905557

Claim:
An integrated structure, comprising: a first element having a plurality of first metallic contact structures; a second element comprising a plurality of second metallic contact structures, a substantial portion of second element being removed by at least one of grinding and polishing; a first oxide layer disposed on a surface of said first element, said first oxide layer having a first polished surface with a surface roughness in a surface roughness range; a second oxide layer disposed on a surface of said second element, said second oxide layer having a second polished surface with a surface roughness in said range of surface roughness; and an interconnection formed between said at least one of said first metallic contact structures and at least one of said second metallic contact structures, wherein said first oxide layer is directly bonded to said second oxide layer through said first and second polished surfaces without application of temperature and with a bond strength sufficient to permit removal of said portion of said second element after bonding said first and second oxide layers.