Patent ID: 7906774
Filing Date: 2011-03-15
Classification: H01L

Abstract:
1. A phase change memory device, comprising: a substrate; a phase change layer over the substrate; a first electrode electrically connecting a first side of the phase change layer; and a second electrode electrically connecting a second side of the phase change layer, wherein the phase change layer composes mainly of gallium (Ga), antimony (Sb) and tellurium (Te) and unavoidable impurities, having the composition range of 5<x<40; 8<y<48; 42<z<80, wherein x+y+z=100, and the phase change layer in the said device is characteristic of: reversible phase change between amorphous and crystalline states upon a pulsed electrical current of appropriate amplitude and duration flowing through the first and second electrodes, wherein the phase change memory device has two reset states and a three-digit per cell memory characteristics.