Patent ID: 7518251

Claim:
A stacked electronics module comprising: a first layer comprising a first substrate having a front side and a backside; a first electrical interconnect layer disposed on the first substrate; a first electronic device disposed on the front side of the first substrate; a first plurality of metal pads disposed on the backside of the first substrate; a second plurality of metal pads disposed on the first plurality of metal pads; a second layer comprising a second substrate having a front side and a backside; a second electrical interconnect layer disposed on the second substrate; and a second electronic device disposed on the front side of the second substrate; and a plurality of trenches formed in the front side of the second substrate, wherein each of the plurality of trenches is configured to matably receive a respective one of the plurality of metal pads to form an interlocking structure to mechanically align the first layer and the second layer in the x-y direction.