Hole Trapping, Recombination and Space Charge in Irradiated Sandia Oxides

A computer model for calculating radiation effects in MOS oxides is presented. Good agreement is obtained between theory and photoconductivity experiments (photo-current and flat band shift as a function of total dose) on Sandia radiation hard oxides. It is also shown that doses above 108 rads (delivered by a focused electron beam) are required to produce a significant number of new defect traps.