Patent ID: 7589342
Filing Date: 2009-09-15
Classification: B82Y,H01L,Y10S

Abstract:
1. A phase change memory device comprising a data storage unit comprising: a semiconductor substrate; a first insulating interlayer having a first contact hole formed on the semiconductor substrate; a contact plug made of an electrically conductive material and formed to partially fill the first contact hole; a catalyst layer formed on the contact plug, wherein the catalyst layer comprises a catalytic agent capable of promoting growth of a carbon nano tube and is formed on the contact plug to fill the first contact hole; a second insulating interlayer formed on the first insulating interlayer including the catalyst layer, wherein the second insulating interlayer has a second contact hole through which the catalyst layer is exposed, a carbon nano tube lower electrode formed on the catalyst layer, wherein the carbon nano tube lower electrode is formed inside the second contact hole contacting the catalyst layer; a phase change layer formed on the carbon nano tube lower electrode, the phase change layer also being formed on a portion around the second contact hole on the second insulating interlayer portion; and an upper electrode formed on the phase change layer, wherein the phase change layer is capable of changing phase when current is applied between the lower and upper electrodes.