A 3D semiconductor device, the device including: a first level including a plurality of first single crystal transistors; contact plugs; a first metal layer, where a portion of the contact plugs provide connections from the plurality of first single crystal transistors to the first metal layer, and where connections include forming memory control circuits; a second level including a plurality of second transistors; a third level including a plurality of third transistors, where the second level overlays the first level, the third level overlays the second level; a second metal layer overlaying the third level; and a third metal layer overlaying the second metal layer, where second transistors are aligned to first transistors with less than 40 nm alignment error, where the second level includes first memory cells, where the third level includes second memory cells, and where the memory control circuits are designed to adjust a memory write voltage according to the device specific process parameters.

A 3D memory device, the device including: a first single crystal layer including memory peripheral circuits; a first memory layer including a first junction-less transistor; a second memory layer including a second junction-less transistor; and a third memory layer including a third junction-less transistor, where the first memory layer overlays the first single crystal layer, where the second memory layer overlays the first memory layer, where the third memory layer overlays the second memory layer, where the first junction-less transistor, the second junction-less transistor and the third junction-less transistor are formed by a single lithography and etch process, and where the first memory layer includes a nonvolatile NAND type memory.

A 3D memory device, the device including: a first single crystal layer including memory peripheral circuits; a first memory layer including a first junction-less transistor; a second memory layer including a second junction-less transistor; and a third memory layer including a third junction-less transistor, where the first memory layer overlays the first single crystal layer, where the second memory layer overlays the first memory layer, where the third memory layer overlays the second memory layer, where the first junction-less transistor, the second junction-less transistor and the third junction-less transistor are formed by a single lithography and etch process, and where the first memory layer includes a nonvolatile NAND type memory.

A 3D semiconductor device, the device including: a first layer including a first single crystal transistor; a second layer including second transistors; a third layer including third transistors; a fourth layer including fourth transistors, where the first layer is overlaid by the second layer, where the second layer is overlaid by the third layer, and where the third layer is overlaid by the fourth layer; where a plurality of the fourth transistors are aligned to the plurality of the first single crystal transistor with less than 40 nm alignment error, where the third transistors are junction-less transistors (JLT), where each of the fourth transistors include a transistor channel, a drain and a source, and where the transistor channel is significantly narrower than the drain or the source.

A 3D semiconductor device, the device including: a first layer including a first single crystal transistor; a second layer including second transistors; a third layer including third transistors; a fourth layer including fourth transistors, where the first layer is overlaid by the second layer, where the second layer is overlaid by the third layer, and where the third layer is overlaid by the fourth layer; where a plurality of the fourth transistors are aligned to the plurality of the first single crystal transistor with less than 40 nm alignment error, where the third transistors are junction-less transistors (JLT), where each of the fourth transistors include a transistor channel, a drain and a source, and where the transistor channel is significantly narrower than the drain or the source.

A 3D semiconductor device, the device including: a first crystalline silicon layer including a plurality of first transistors; a first metal layer interconnecting the first transistors, a portion of the first transistors forming a plurality of first logic gates; a first array of memory cells including second transistors; a second metal layer overlying the first and second transistors; a second crystalline silicon layer overlaying the second metal layer and the second crystalline silicon layer including a plurality of third transistors; a third metal layer interconnecting the third transistors, a portion of the third transistors forming a plurality of second logic gates; a second array of memory cells including fourth transistors and overlaying the second crystalline silicon layer; a fourth metal layer overlying the third and fourth transistors, where at least one of the fourth transistors is overlaying at least another one of the fourth transistors such that they are self-aligned, having been processed following the same lithography step, where the second array of memory cells include NAND flash type memory cells.

A 3D semiconductor device, the device including: a first crystalline silicon layer including a plurality of first transistors; a first metal layer interconnecting the first transistors, a portion of the first transistors forming a plurality of first logic gates; a first array of memory cells including second transistors; a second metal layer overlying the first and second transistors; a second crystalline silicon layer overlaying the second metal layer and the second crystalline silicon layer including a plurality of third transistors; a third metal layer interconnecting the third transistors, a portion of the third transistors forming a plurality of second logic gates; a second array of memory cells including fourth transistors and overlaying the second crystalline silicon layer; a fourth metal layer overlying the third and fourth transistors, where at least one of the fourth transistors is overlaying at least another one of the fourth transistors such that they are self-aligned, having been processed following the same lithography step, where the second array of memory cells include NAND flash type memory cells.

A 3D semiconductor device, the device including: a first single crystal layer including a plurality of first transistors; at least one first metal layer interconnecting the plurality of first transistors, where the interconnecting includes forming memory peripheral circuits; a plurality of second transistors underlying the first single crystal layer; a second metal layer overlaying the plurality of second transistors; a first memory cell underlying the memory peripheral circuits; a second memory cell underlying the first memory cell, and a non-volatile NAND memory, where the first memory cell includes at least one of the second transistors, where at least one of the second transistors includes a source, channel and drain, where the source, the channel and the drain have the same dopant type, here the non-volatile NAND memory includes the first memory cell, and where at least one of the second transistors includes a polysilicon channel.

A 3D semiconductor device, the device including: a first single crystal layer including a plurality of first transistors; at least one first metal layer interconnecting the plurality of first transistors, where the interconnecting includes forming memory peripheral circuits; a plurality of second transistors underlying the first single crystal layer; a second metal layer overlaying the plurality of second transistors; a first memory cell underlying the memory peripheral circuits; a second memory cell underlying the first memory cell, and a non-volatile NAND memory, where the first memory cell includes at least one of the second transistors, where at least one of the second transistors includes a source, channel and drain, where the source, the channel and the drain have the same dopant type, here the non-volatile NAND memory includes the first memory cell, and where at least one of the second transistors includes a polysilicon channel.

A memory cell is formed by a PIN diode having three contacts. A breakdown voltage is applied to break down a gate oxide arranged between a region of the PIN diode and a substrate region. The breakdown or non-breakdown state of the gate oxide is determined by applying a read voltage between the anode and the cathode of the diode and determining the value of the corresponding current flowing in the diode.