A method of manufacturing semiconductor wafers, the method including: providing a donor wafer including a semiconductor substrate; performing a lithography step and processing the donor wafer; and performing at least two subsequent steps of layer transfer out of the donor wafer, each layer transfer step producing a transferred layer, where each of the transferred layers had been affected by the lithography step, and where each of the transferred layer includes a plurality of transistors with side gates, and where the layer transfer includes an ion-cut, the ion-cut including an ion implant thru the transistors.

A device comprising semiconductor memories, the device comprising: a first layer and a second layer of layer-transferred mono-crystallized silicon, wherein the first layer comprises a first plurality of horizontally-oriented transistors; wherein the second layer comprises a second plurality of horizontally-oriented transistors; and wherein the second plurality of horizontally-oriented transistors overlays the first plurality of horizontally-oriented transistors.

A semiconductor device including a first layer including first transistors, wherein first logic circuits are constructed by the first transistors, and wherein the first logic circuits include at least one of Inverter, NAND gate, or NOR gate; and a second layer overlaying said first layer, the second layer including second transistors, wherein second logic circuits are constructed by the second transistors; wherein each logic circuit in the first logic circuits has inputs and at least one first output, the inputs are connected to the second logic circuits; wherein each logic circuit in the second logic circuits has a second output, and wherein the first transistors include first selectors adapted to selectively replace at least one of the at least one first outputs with at least one of the second outputs.

A semiconductor device including a first single crystal layer with first transistors and a first alignment mark; at least one metal layer overlying the first single crystal layer, wherein the at least one metal layer includes copper or aluminum; and a second layer including activated dopant regions, the second layer overlying the at least one metal layer, wherein the second layer includes second transistors, wherein the second transistors are processed aligned to the first alignment mark with less than 100 nm alignment error, and the second transistors include mono-crystal, horizontally-oriented transistors.

A method for fabrication of semiconductor device comprising a first wafer comprising first single crystal layer comprising first transistors, first alignment marks, and first transistors interconnect layers comprising at least one metal layer overlying said first single crystal silicon layer, wherein said at least one metal layer comprises copper or aluminum; and comprising a step of implant and high temperature activation to form a conductive layer within a second wafer; and forming a second crystallized layer on top of said first wafer by transferring said conductive layer using ion-cut process, and forming second transistors on said second crystallized layer wherein said second transistors source and drain comprises portion of said first conductive layer.

A semiconductor device comprising power distribution wires wherein; a portion of said wires have thermal connection to the semiconductor layer and said thermal connection designed to conduct heat but to not conduct electricity.

A semiconductor device includes a first mono-crystallized layer including first transistors, and a first metal layer forming at least a portion of connections between the first transistors; and a second layer including second transistors, the second transistors including mono-crystalline material, the second layer overlying the first metal layer, wherein the first metal layer includes aluminum or copper, and wherein the second layer is less than one micron in thickness and includes logic cells.

A semiconductor device includes a first mono-crystallized layer including first transistors, and a first metal layer forming at least a portion of connections between the first transistors; and a second layer including second transistors, the second transistors including mono-crystalline material, the second layer overlying the first metal layer, wherein the first metal layer includes aluminum or copper, and wherein the second layer is less than one micron in thickness and includes logic cells.

A system includes a semiconductor device. The semiconductor device includes a first single crystal silicon layer comprising first transistors, first alignment marks, and at least one metal layer overlying the first single crystal silicon layer, wherein the at least one metal layer comprises copper or aluminum more than other materials; and a second single crystal silicon layer overlying the at least one metal layer. The second single crystal silicon layer comprises a plurality of second transistors arranged in substantially parallel bands. Each of a plurality of the bands comprises a portion of the second transistors along an axis in a repeating pattern.