Patent ID: 7800934

Claim:
A method of operating a nonvolatile memory cell, comprising: providing the nonvolatile memory cell comprising a diode, said diode comprising which is fabricated in a first resistivity, unprogrammed state, wherein the resistivity state of the diode semiconductor material corresponds to a memory state of the memory cell; and applying a forward bias to the diode having a magnitude greater than a minimum voltage required for programming the diode to switch the diode to a second resistivity, programmed state, wherein the second resistivity state is lower than the first resistivity state; wherein the first and the second resistivity states are stable resistivity states of the diode, and wherein: the diode comprises a polycrystalline semiconductor diode; and the step of applying the forward bias comprises applying the forward bias to the semiconductor diode to cause at least one of a change in a degree of order in a polycrystalline semiconductor material of the diode or diffusion of dopant atoms out of grain boundaries into a crystal of the polycrystalline semiconductor material of the diode.