Patent ID: 6953966
Filing Date: 2005-10-11
Classification: H01L

Abstract:
1. A non-volatile semiconductor memory, made by a method of producing comprising: forming a first oxide film on a semiconductor substrate; forming a semiconductor film and an oxidation stopping film on the first oxide film, forming an opening by patterning the oxidation stopping film; forming an insulating local oxide film by local oxidation of a surface of the semiconductor film exposed through the opening; removing the oxidation stopping film; selectively etching the semiconductor film using the local oxide film as a mask to form a floating gate from the semiconductor film remaining under the local oxide film; cleaning the semiconductor substrate; transferring the silicon substrate with the floating gate to a chemical vapor deposition device after said cleaning, wherein an initial temperature of the chemical vapor deposition device is kept in a range of 400° C.±5° C. so that thermal oxidation of a surface of the floating gate is restrained and production is maintained; heating the chemical vapor deposition device from the initial temperature to a chemical vapor deposition temperature in a range of 650° C.±5° C.; and forming a second oxide film covering the floating gate by low pressure chemical vapor deposition after said heating, wherein tetra-ethyl ortho-silicate is used as a material to form the second oxide film.