μtrench phase-change memory cell engineering and optimization
ABSTRACT Phase-change memory (PCM) cell is the most promising technology as post-flash nonvolatile memory (NVM). Among the different proposed cell structures, μtrench allows to simultaneously achieve low programming currents, small cell size, easy tunability and good dimensional control. Aim of this paper is to investigate the optimization and fine tuning capability of this cell architecture. Based on theoretical analysis and experimental results, the dependence of the PCM electrical parameters on the cell structure and on the geometric dimensions is assessed. An optimized μtrench cell with a programming current of 450 μA at 1.5 V and a set resistance of 5 kΩ is finally presented.