Patent ID: 9087793
Filing Date: 2015-07-21
Classification: H01L

Abstract:
1. A method for etching a target layer of a semiconductor device in an etching apparatus to form an element, the method comprising: forming a photoresist pattern on the target layer of the semiconductor device, wherein the photoresist pattern has an after-develop-inspection critical dimension (ADI CD); providing a target after-etch-inspection critical dimension (AEI CD) of the element; providing a trim time of the target layer; providing the etching apparatus; determining a formation time of a protective layer on an inner wall of the etching apparatus based on the ADI CD, the target AEI CD and the trim time; forming the protective layer for the predetermined formation time; and performing a trimming process on the target layer for the trim time by using the photoresist pattern as a mask to form the element.