Patent ID: 6225184
Filing Date: 2001-05-01
Classification: H01L

Abstract:
A semiconductor device manufacturing method comprising the steps of:forming a first insulating film on a substrate which has an impurity diffusion layer;forming a first semiconductor film on the first insulating film;forming a second insulating film, which is formed of material different from the first insulating film, on the first semiconductor film;coating a photosensitive resist on the second insulating film;forming a window in the photosensitive resist over the impurity diffusion layer by exposing and developing the photosensitive resist;forming a first hole in the second insulating film by etching the second insulating film selectively for a first period of time through the window using a halogen compound gas;keeping still an etching state employing the halogen compound gas for a second period of time which is more than the first period of time, after the first hole has been formed, thereby forming a sidewall containing a component of the photosensitive resist on an inner peripheral surface of the first hole to reduce substantial diameter of the first hole;forming a second hole above the impurity diffusion layer by etching the first semiconductor film, and the first insulating film through the first hole while using the sidewall and photosensitive resist as a mask;removing the photosensitive resist and the sidewall;forming a second semiconductor film in the first and second holes and on an upper face of the second insulating film;forming a storage electrode made of the first semiconductor film and the second semiconductor film in region including the first and second holes by patterning the second semiconductor film, the second insulating film, and the first semiconductor film;removing selectively the second insulating film;forming a dielectric film on a surface of the storage electrode; andforming an opposing electrode of the capacitor on a surface of the dielectric film.