Patent ID: 7298031

Claim:
A compound microelectronic device, comprising: a first singulated microelectronic die having a first surface, a second surface opposite the first surface, and a first connection terminal; and a second singulated microelectronic die having a first surface, a second surface opposite the first surface, and a second connection terminal, the second surface of the second microelectronic die and the first surface or the second surface of the first microelectronic die both including a semiconductor material and being planarized, polished, or otherwise processed to be flat enough so that the semiconductor material of the second surface of the second microelectronic die is bonded directly to the semiconductor material of the first surface or the second surface of the first microelectronic die by attractive forces between the semiconductor material of the first singulated microelectronic die and the semiconductor material of the second singulated microelectronic die and without an adhesive between the second surface of the second singulated microelectronic die and the first surface or the second surface of the first microelectronic die.