Patent ID: 8274130
Filing Date: 2012-09-25
Classification: G11C,H01L

Abstract:
1. A non-volatile storage device comprising: a first plurality of conductors; a second plurality of conductors, one of the first conductors and one of the second conductors define a pair of conductors; a plurality of memory cells, each of the memory cells residing between one pair of the pairs of conductors, each of the memory cells including: a reversible resistivity-switching element; and a diode in series with the reversible resistivity-switching element, the diode including a first region of a semiconductor material that is heavily-doped with an impurity having a first conductivity, the diode including a second region of a semiconductor material that is lightly-doped with an impurity having a second conductivity, the diode including a third region of a semiconductor material that is heavily-doped with an impurity having the first conductivity, the second region resides between the first region and the third region, the doping profile in the first region and the third region is graded with the doping concentration being lowest near the second region.