A new Si-H infrared absorption peak at 2016cm-1 is found to be related to the hydrogen-defect shallow donors apart from the 2162cm-1 peak, indicating that the shallow donors do not correspond to only one kind of defect structure. The micro-structure of th

Doppler broadening positron annihilation spectroscopy has been used to investigate the effects of neutron integrated flux and hydrogen on annealing behaviour of defects in silicon crystals. The concentration of neutron radiation defects was estimated, act

The defect evolution as a function of the an-nealing temperature has been studied in monocrystalline silicon grown in a hydrogen atmosphere and irradiated with 3.6x1017 neutrons/cm2. Positron lifetime spectros-copy has been used and the results compared w

The V and V2-type defects are dominant in NTD Si irradiated with 6x1016, 3.6xl027 and 1.2x1018 neutrons/cm2. Two distinct annealing stages of V-type defects exist: one at about 200℃ due to the annealing-out of P-V and (V2-O)- complexes; the other at about

The positron lifetime spectroscopy indicates that the V- and V2-type defects coexist in hydrogen containing FZ Si irradiated with high-dose reactor neutrons. Their positron annihilation behavior has been ascribed to the formation and annealing out of some