Patent ID: 6033952
Filing Date: 2000-03-07
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising the steps of:forming on a silicon substrate a plurality of transfer gates, each of which has a frame;forming an oxide film for use as an interlayer dielectric film so as to extend over the plurality of transfer gates and holes formed between the plurality of transfer gates;a first etch pattern forming on the oxide film an etch pattern which can establish contact with the silicon substrate so as to extend across the frames, through a storage node mask and by use of a positive photoresist;a first dry-etching the oxide film along the etch pattern by setting an etch time to a time required for etching away the oxide film deposited at the bottom of the hole;forming a thick polysilicon film on the oxide film;a second etch pattern forming the etch pattern on the thick polysilicon film, through the previously-used storage node mask once again and by use of a positive photoresist;a second dry-etching in a collective manner the thick polysilicon film and a damaged layer that is formed on the silicon substrate as a result of the first dry etch step, by setting an etch time to a time required for etching away the thick polysilicon film and the damaged layer;a third etch pattern forming an etch pattern on the thick polysilicon film, through the storage node mask and by use of a negative photoresist; anda third dry etch forming a storage node by dry-etching the thick polysilicon film along the etch pattern that is formed as a result of the third etch pattern forming step, by means of anisotropic etching.