Patent ID: 8907316

Claim:
A memory cell, comprising: an access device comprising: a single crystalline semiconductor fin on a substrate extending in a first direction, and separated by insulators from laterally adjacent single crystalline semiconductor fins; a first doped semiconductor region having a first conductivity type in the single crystalline conductive fin; and a polycrystalline member on top of the first doped semiconductor region, the polycrystalline member including a second doped semiconductor region having a second conductivity type opposite the first conductivity type, the first and second doped semiconductors defining a pn-junction therebetween; wherein the doping concentration of the second doped semiconductor region is in a range about 10 to about 1000 times higher than the doping concentration of the first doped semiconductor region; an electrode electrically connected to the polycrystalline member; a memory element contacting the electrode; a conductive line extending in a second direction, over and electrically connected to the memory element; and a peripheral area on the substrate including a peripheral circuit single crystal semiconductor region which is part of a single crystal semiconductor body or layer that includes the single crystalline semiconductor fin, the peripheral circuit single crystal semiconductor region including a channel of an FET, a gate dielectric material on the channel and a gate, and wherein the polycrystalline member contacts the first doped semiconductor region without intervening gate dielectric material.