Patent ID: 11916018
Assignee: WINBOND ELECTRONICS CORP.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A manufacturing method of a connection structure of a semiconductor device, comprising:
providing a substrate;
forming an interlayer dielectric on the substrate;
forming a top metal structure on the interlayer dielectric, wherein the top metal structure comprises:
a bottom portion comprising a first sidewall; and
a top portion disposed on the bottom portion, wherein the top portion comprises a second sidewall, and a slope of the first sidewall is larger than a slope of the second sidewall; and

forming a passivation layer conformally on the second sidewall, the first sidewall, and a top surface of the interlayer dielectric, wherein the second sidewall of the top portion is directly connected with the first sidewall of the bottom portion, the first sidewall is directly connected with the top surface of the interlayer dielectric, and the second sidewall of the top portion consists of a planar surface in a cross section diagram of the top metal structure,
wherein the step of forming the top metal structure comprises:
forming a top metal layer on the interlayer dielectric;
forming a patterned photoresist layer on the top metal layer; and
performing an etching process to the top metal layer with the patterned photoresist layer as a mask, wherein the etching process comprises:
a main etching step; and
an over etching step performed after the main etching step, wherein the main etching step has a first etching rate to the patterned photoresist layer, the over etching step has a second etching rate to the patterned photoresist layer, and the first etching rate is higher than the second etching rate, wherein the main etching step has a third etching rate to the top metal layer, the over etching step has a fourth etching rate to the top metal layer, and a ratio of the third etching rate to the first etching rate is lower than a ratio of the fourth etching rate to the second etching rate.