Patent ID: 8653598

Claim:
An electrical switch using a recessed channel gated resistor structure, including: an isolation layer having a first face and a second face opposite to the first face; a doped silicon layer arranged on the first face of the isolation layer and having a recessed portion with reduced thickness, the doped silicon layer having a predetermined doping type, wherein the doped silicon layer has a substantially uniform doping profile with same doping concentrations along a direction horizontal to the isolation layer at same depths, respectively, and a doping concentration below an exposed surface of the recessed portion in the doped silicon layer is smaller than a doping concentration above a surface level of the exposed surface in the doped silicon layer; a gate dielectric covering at least part of the recessed portion of the doped silicon layer; a gate layer arranged atop the gate dielectric and covering at least part of the gate dielectric; at least one electrical contact connected to the doped silicon layer; at least one electrical contact connected to the gate layer; wherein the recessed portion in the doped silicon layer makes a thickness of the doped silicon layer between the exposed surface and the first face be thin enough so that a channel defined thereby under the gate layer can be fully depleted to form a high resistivity region.