Integrated thermoelectric/ thermionic energy converter

A device for converting heat into electrical energy that is an integrated combination of thermionic and thermoelectric energy converters in a single device, or "TITE". The electron output of thermionic portion of the TITE is the input of the thermoelectric portion of the device. The electron collector is covered by a thin layer of doped or undoped semiconductor material or a combination of doped and undoped semiconductor materials with appropriate doping and thickness to achieve increased operational temperature ranges and efficiency.