Patent ID: 9012294
Filing Date: 2015-04-21
Classification: H01L

Abstract:
1. A method of manufacturing a non-volatile memory device, comprising steps of: forming a first electrode on a substrate; forming an interlayer insulating layer on the first electrode; forming a memory cell hole in the interlayer insulating layer such that the memory cell hole penetrates the interlayer insulating layer and exposes the first electrode; forming a first variable resistance layer inside of the memory cell hole; and forming a second variable resistance layer after the step of forming the first variable resistance layer inside of the memory cell hole; and forming a second electrode on the second variable resistance layer, wherein: the first variable resistance layer comprises a first transition metal oxide and the second variable resistance layer comprises a second transition metal oxide, the second transition metal oxide being an oxygen-deficient transition metal oxide, each of the step of forming the first variable resistance layer and the step of forming the second variable resistance layer includes performing a cycle once or plural times, the cycle including: the step of forming the first variable resistance layer is performed in a state in which the substrate is kept at a temperature at which a self-decomposition reaction of the source gas does not occur and such that the first variable resistance layer is formed to conformally cover a bottom portion and a side wall of the memory cell hole, the first variable resistance layer and the second variable resistance layer are formed in such a manner that at least one condition used for forming the first variable resistance layer and the second variable resistance layer is different such that the second variable resistance layer is oxygen-deficient and an oxygen content of the first variable resistance layer is higher than an oxygen content of the second variable resistance layer, the at least one condition being selected from the group consisting of a temperature of the substrate, an amount of the introduced source gas and an amount of the introduced reactive gas, the step of forming the first variable resistance layer includes performing a first cycle once or plural times, the first cycle including: the step of forming the second variable resistance layer is performed in a state in which the substrate is kept at a temperature at which the self-decomposition reaction of the source gas occurs, and includes performing a second cycle once or plural times, the second cycle including: the A1, A2, A3 and A4 steps are the first, second, third and fourth steps included in the step of forming the first variable resistance layer, respectively, and the B1, B2, B3 and B4 steps are the first, second, third and fourth steps included in the step of forming the second variable resistance layer, respectively.