US Patent 11038101 Semiconductor structure having a phase change memory device

A semiconductor structure includes a first conductive layer and a second conductive layer, and a memory device between the first conductive layer and the second conductive layer. The memory device includes a top electrode, a bottom electrode adjacent to the first conductive layer, and a phase change material between the top electrode and the bottom electrode. The bottom electrode includes a first portion and a second portion between the first portion and the first conductive layer.