Patent ID: 7749801
Filing Date: 2010-07-06
Classification: B82Y,G11C,H01L,Y10S

Abstract:
1. A method for fabricating a phase change memory using carbon nanotubes, the method comprising: disposing a catalyst for forming a plurality of carbon nanotubes over predetermined regions of a current source electrode supplying external current to a target, thereby widening the predetermined regions responsible for the phase change and increasing the threshold margin of a phase change material; growing the carbon nanotubes in vertical direction using the catalyst as a seed to form carbon nanotube electrodes; depositing an insulation layer over the current source electrode in a manner to cover the carbon nanotube electrodes; polishing the insulation layer until flush with the carbon nanotube electrodes to form a planarized insulation layer flush with the carbon nanotube electrodes; and forming a phase change material layer over the planarized insulation layer, which is flush with the carbon nanotube electrodes, in contact with the carbon nanotube electrodes.