Patent ID: 8330202

Claim:
A field effect transistor, comprising: a substrate having a first doping type and first doping level; at least one source diffusion region having a second doping type and a second doping level, and at least one drain diffusion region having the second doping type and the second doping level separated from the at least one source diffusion region by a channel region having the first doping type and a third doping level; a gate insulator having a specified first thickness disposed on the substrate and extending over the entire channel region and at least a portion of the source diffusion region and at least a portion of the drain diffusion region; and a floating gate electrode disposed over the gate insulator and extending over at least a portion of each of the source and drain diffusion regions, formed of a mixture including at least germanium and carbon, having a first specified percentage of germanium atoms, a second specified percentage of silicon atoms, and a third specified percentage of carbon atoms, the specified first, second and third percentage selected to obtain at least a desired tunneling current at a desired voltage; an inter-gate insulator having a specified second thickness disposed over the floating gate; and a control gate disposed over the inter-gate insulator and substantially separated from the substrate by the inter-gate insulator and the floating gate, and substantially the entirety of the floating gate.