Patent ID: 8399285

Claim:
A method for manufacturing a phase change memory device having a plurality of memory cells, the method comprising the steps of: forming a plurality of N+ base layers on a surface of a substrate; forming vertically a plurality of PN diodes on the N+ base layers; forming vertically a plurality of heaters on the PN diodes, each heater having a horizontal cross-sectional bent shape; forming vertically a plurality of phase change layers on the heaters; forming vertically a plurality of top electrodes on the phase change layers, wherein the phase change layers and the top electrodes comprise a plurality of stack patterns; forming vertically a plurality of top electrode contacts on the top electrodes; forming horizontally a plurality of bit lines along a first direction on top of the top electrode contacts; and forming horizontally a plurality of word lines along a second direction on top of the top electrode contacts wherein the second direction is substantially perpendicular to the first direction.