02-01-2020 дата публикации
Номер: US20200006288A1
Принадлежит:
A method includes forming a first device die, which includes depositing a first dielectric layer, and forming a first metal pad in the first dielectric layer. The first metal pad includes a recess. The method further includes forming a second device die including a second dielectric layer and a second metal pad in the second dielectric layer. The first device die is bonded to the second device die, with the first dielectric layer being bonded to the second dielectric layer, and the first metal pad being bonded to the second metal pad. 1. A device comprising: a first dielectric layer; and', a diffusion barrier contacting the first dielectric layer; and', 'a metallic material between opposite portions of the diffusion barrier, wherein in a cross-sectional view of the first metal pad, an edge portion of the metallic material is recessed from a top edge of a nearest portion of the diffusion barrier to form an air gap; and, 'a first metal pad comprising], 'a first device die comprising a second dielectric layer bonded to the first dielectric layer; and', 'a second metal pad bonded to the first metal pad through metal-to-metal direct bonding., 'a second device die comprising2. The device of claim 1 , wherein the air gap further extends into the second metal pad.3. The device of claim 1 , wherein the air gap is formed between a sidewall of the diffusion barrier claim 1 , a surface of the metallic material claim 1 , and a surface of the second metal pad.4. The device of claim 1 , wherein the air gap is formed between a sidewall of the diffusion barrier claim 1 , a surface of the metallic material claim 1 , and a surface of the second dielectric layer.5. The device of claim 1 , wherein a surface of the metallic material in the first metal pad and facing the air gap is rounded.6. The device of claim 1 , wherein a surface of the second metal pad facing the air gap is rounded.7. The device of claim 1 , wherein the first device die further comprises a third metal pad comprising ...
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