Patent ID: 7648910

Claim:
A method of manufacturing an opening, comprising: providing a substrate including a conductive portion and a dielectric layer both formed thereon, wherein the conductive portion at least comprises a conductive layer and a passivation layer from bottom-up, and the dielectric layer covers the conductive portion; performing a first dry etching step to the dielectric layer to form an opening on the passivation layer by using a reactive gas containing a high polymer gas, wherein an original thickness of the passivation layer below the opening is reduced to a reduced thickness, a bottom of the opening has an initial dimension, and an obtuse angle is included by the bottom of the opening and an inner sidewall of the opening; and performing an opening enlarging step to reach a target dimension of the bottom of the opening, wherein the target dimension is larger than the initial dimension to the least extent the conductive layer is not exposed by the opening, and a difference between the target dimension and the initial dimension is less than the reduced thickness of the passivation layer.