RADIATION-INDUCED DEFECT INTRODUCTION RATES IN SEMICONDUCTORS

The defect introduction rate at 295K by 1-MeV electrons in the p-side of n(+)-p silicon junctions under various applied voltages was measure d using both DLTS and C-V techniques. The introduction rate of most de fects is a strong function of applied bias and distance from the junct ion. Open circuit irradiation produces the smallest introduction rate while reverse bias enhances the rate by a factor of five for most defe cts. The C-V technique finds three times the concentration of defects that the DLTS technique finds. The C-V technique cannot distinguish ty pes of defects: it sums all defects. Heavy reverse bias irradiations p roduced unstable junctions that could be partially restabilized by fur ther opera circuit irradiations. The electron-hole pairs generated by the irradiation appear to play a major role in the development of the final defect population resulting from the same irradiation. Even in a short irradiation, defects initially created early in the irradiation are altered or annealed by continued irradiation. Recombination-enhan ced diffusion theory appears to explain some of the results and, there fore, may be an important factor in the defect introduction process in many semiconductors.