Patent ID: 11955346
Assignee: MICRON TECHNOLOGY, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A method of manufacturing a semiconductor device, comprising:
providing a substrate including traces, wherein the traces protrude above a top surface of the substrate;
forming a prefill material over the substrate and between the traces, wherein the prefill material directly contacts peripheral surfaces of the traces;
providing a die including a bottom surface, wherein the provided die includes (1) electrical contacts with solder, and (2) and a wafer-level underfill on the bottom surface, wherein the wafer-level underfill includes material at least initially configured to reduce viscosity during at least a portion of reflowing the solder;
attaching the die to the substrate based on reducing a viscosity of the wafer-level underfill before and/or while reflowing the solder; and
curing the wafer-level underfill, wherein the wafer-level underfill persists as a layer separate from the prefill material after the curing.