Patent ID: 8445880
Filing Date: 2013-05-21
Classification: H01L

Abstract:
1. A phase change memory device, comprising: a semiconductor substrate in which a memory cell area and a bit-line discharge area are defined; a word line area formed in the memory cell area of the semiconductor substrate; a discharge line area formed in the bit-line discharge area of the semiconductor substrate; a switching PN diode formed on the word line area; a dummy PN diode formed on the discharge line area; a phase change structure formed on the switching PN diode and electrically connected to the switching diode; and a bit line formed on the phase change structure and the dummy PN diode, wherein the bit line which is formed on the memory cell area is electrically connected to the phase change structure, and the bit line which is formed on the bit line discharge area is connected to the dummy PN diode using a plug, and wherein the plug is configured to have direct physical contact with the dummy PN diode.