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

Claim 19:
20. A method of manufacturing a semiconductor device, comprising
providing a substrate including
traces protruding above a top surface of the substrate, and
a solder mask on a top portion of the substrate, wherein the solder mask has a mask opening area that exposes at least a portion of the traces;

forming a prefill material over the substrate and in the mask opening area, wherein the formed prefill material is partially or fully cured;
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; and
attaching the die to the substrate based on reflowing the wafer-level underfill before and/or while reflowing the solder, wherein attaching the die is initiated with the prefill material partially or fully cured.