Patent ID: 11961777
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A method of forming a package structure, comprising:
mounting a first die and a second die on a carrier;
forming a buffer material to conformally cover the first die and the second die;
performing an exposure process on the buffer material by using a mask with an opening corresponding to the second die, wherein the opening comprises a frame shape surrounding a perimeter of the second die;
performing a developing process to remove a portion of the buffer material to form a buffer layer that extends continuously from a sidewall of the second die to cover a sidewall of the first die adjacent to the second die; and
forming a first encapsulant encapsulating the first die and the second die, wherein the second die has a second encapsulant encapsulating a die stack, the buffer layer is formed between the first encapsulant and the second encapsulant, and the buffer layer has a Young's modulus less than a Young's modulus of the first encapsulant and a Young's modulus of the second encapsulant.