Patent ID: 6793833
Filing Date: 2004-09-21
Classification: H01J,H01L

Abstract:
An etching method for forming a trench having a prescribed depth in an organic insulating film, comprising the step of:providing a wafer having an organic insulating film thereon, the wafer not having an etching stopper layer around the prescribed depth of the organic insulating film; generating a plasma from a gas containing hydrogen and nitrogen; measuring a light emission spectral intensity ratio between cyan molecules and hydrogen atoms in the plasma; etching a portion of the organic insulating film with the plasma to the prescribed depth less than a thickness of the organic insulating film with the plasma; and controlling the plasma to keep a measured value of the light emission spectral intensity ratio at a value not exceeding a prescribed value so as to form the trench in the organic insulating film to the prescribed depth while suppressing microtrenching.