Patent ID: 11948960
Assignee: TONGFU MICROELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. The method according to claim 8, wherein forming the metal rewiring layer in the through-hole includes:
forming a first mask layer on the back surface of the chip substrate and a surface of the through-hole, and forming a first opening in the first mask layer at a position corresponding to the pad,
forming a first seed layer on a surface of the first mask layer away from the chip substrate,
forming a second mask layer on a surface of the first seed layer away from the chip substrate, and forming a second opening in the second mask layer above the pad,
forming the metal rewiring layer in the second opening, and
removing the second mask layer and the first seed layer outside the metal rewiring layer.