A nonvolatile memory device having two or more resistors and methods of
forming and using the same. A nonvolatile memory device having two
resistance layers, and more particularly, to a nonvolatile memory device
formed and operated using a resistance layer having memory switching
characteristics and a resistance layer having threshold switching
characteristics. The nonvolatile semiconductor memory device may include
a lower electrode; a first resistance layer having at least two
resistance characteristics formed on the lower electrode, a second
resistance layer having threshold switching characteristics formed on the
first resistance layer, and an upper electrode formed on the second
resistance layer.