SOI transistor measurement techniques using body contacted transistors

Measurements of body-contacted SOI MOS transistors are used to isolate parameters of the back channel and island edge transistor. Properties of the edge and back channel transistor have been measured before and after X-ray irradiation using an ARACOR machine. The unique properties of the edge transistor are shown to be a result of edge geometry as confirmed by a two-dimensional transistor simulator. Two different edge FET characteristics were found; one is associated with the bottom corner and the other with the top corner. The bottom corner FET characteristic is dependent on positive charge trapping at the silicon-insulator interface. It has also been established that the V/sub t/ shift with radiation of the top corner edge FET is comparable to the V/sub t/ shift of the top FET for the Rockwell SOS3H process.<
>