Patent ID: 8999808
Filing Date: 2015-04-07
Classification: H01L

Abstract:
1. A method for manufacturing a nonvolatile memory element, the method comprising: forming a first electrode layer above a substrate; forming, above the first electrode layer, a first variable resistance layer comprising an oxygen-deficient first metal oxide; forming, above the first variable resistance layer, a second variable resistance layer which comprises a second metal oxide, and includes a plurality of host layers and an inserted layer provided between each of adjacent pairs of the host layers, the second metal oxide having a degree of oxygen deficiency smaller than a degree of oxygen deficiency of the first metal oxide; and forming a second electrode layer on the second variable resistance layer, wherein in the forming of a second variable resistance layer, the host layer is formed above the first variable resistance layer, the host layer comprising the second metal oxide having a degree of oxygen deficiency smaller than the degree of oxygen deficiency of the first metal oxide, the inserted layer is formed above the host layer, the inserted layer comprising the second metal oxide having a degree of oxygen deficiency larger than a degree of oxygen deficiency of the host layer, and another host layer is formed above the inserted layer, after the host layer and the inserted layer are formed at least once in this order, the another host layer comprising the second metal oxide having a degree of oxygen deficiency smaller than a degree of oxygen deficiency of the inserted layer.