Patent ID: 8574957
Filing Date: 2013-11-05
Classification: G11C,H01L

Abstract:
1. A method for manufacturing a nonvolatile semiconductor memory element, comprising: forming a contact plug above a substrate; depositing a first conductive film so that the contact plug is covered therewith; depositing, on the first conductive film, a variable resistance film including multiple layers having different oxygen content percentages; depositing a second conductive film on the variable resistance film; forming a top electrode by patterning the second conductive film; forming a variable resistance layer by patterning the variable resistance film; and forming a bottom electrode connected to the contact plug, by patterning the first conductive film, said method further comprising oxidizing to insulate an end portion of the variable resistance layer or a portion of the variable resistance film which is to be the end portion of the variable resistance layer, at least prior to forming the bottom electrode.