Some embodiments relate to a memory device. The memory device includes a programmable metallization cell random access memory (PMCRAM) cell. The programmable metallization cell comprises a dielectric layer disposed over a bottom electrode, the dielectric layer contains a central region. A conductive bridge is formable and erasable within the dielectric layer and the conductive bridge is contained within the central region of the dielectric layer. A metal layer is disposed over the dielectric layer. A heat dispersion layer is disposed between the bottom electrode and the dielectric layer.