Patent ID: 7355249

Claim:
A structure for detecting ionizing radiation, the structure comprising: a substrate having a buried insulator layer formed over the substrate and an active layer formed over the buried insulator layer, the active layer having a doping level and thickness such that the active layer is fully depleted; a transistor formed over the active layer, the transistor including a first gate conductor, a first gate dielectric, and source/drain diffusion regions, the first gate conductor including a material having a substantially depleted doping concentration, the first gate conductor further including intrinsic polysilicon and a portion doped with an impurity; a second gate conductor formed in the substrate and below the buried insulator layer, wherein a portion of the buried insulator layer provides a second gate dielectric corresponding to the second gate conductor; and a channel region between the first gate conductor and the second gate conductor, wherein the second gate conductor controls the channel region.