Patent ID: 11961781
Assignee: QORVO US, INC.
Field: nan (nan)
Classification: CPC nan | IPC H

Claim 0:
1. An apparatus comprising:
a mold device die comprising a device region, a barrier layer, and a first mold compound with nanotube particles, wherein:
the device region includes a front-end-of-line (FEOL) portion and a back-end-of-line (BEOL) portion wherein the FEOL portion comprises an active layer, a contact layer, and isolation sections;
a bottom surface of the active layer and a bottom surface of each isolation section are substantially coplanar and are in contact with a top surface of the contact layer, and the BEOL portion is underneath a bottom surface of the contact layer;
the FEOL portion is configured to provide at least one field-effect transistor (FET), wherein the active layer includes a source, a drain, and a channel of the at least one FET, while the contact layer includes a gate structure of the at least one FET, the gate structure extending horizontally underneath the channel;
the isolation sections, which are formed of silicon dioxide, surround the active layer and extend vertically beyond a top surface of the active layer to define an opening within the isolation sections and over the top surface of the active layer;
the barrier layer continuously extends over the top surface of the active layer and inner side surfaces of the isolation sections within the opening, and over top surfaces of the isolation sections;
the first mold compound extends over the barrier layer and fills the opening, such that a bottom portion of the first mold compound fully covers and is in contact with the barrier layer, wherein silicon crystal, which has no germanium, nitrogen, or oxygen content, does not exist between the bottom portion of the first mold compound and the active layer; and
the nanotube particles are dispersed throughout the bottom portion of the first mold compound and are fully dispersed over the barrier layer, wherein the first mold compound fills gaps among the nanotube particles and the nanotube particles have a higher thermal conductivity than the first mold compound alone; and

a multilayer redistribution structure formed underneath the BEOL portion of the mold device die, wherein the multilayer redistribution structure comprises a plurality of bump structures, which is on a bottom surface of the multilayer redistribution structure and electrically coupled to the FEOL portion of the mold device die.