The effects of enhanced hydrostatic pressure (HP, up to 1.2 GPa) on the properties of
nitrogen-containing Cz-Si:N (N content , interstitial oxygen concentration
9 × 1017 cm−3) and of Czochralski-grown silicon (Cz-Si, reference samples) treated for 5 h at
1070–1570 K–HP have been investigated by photoluminescence, x-ray and infrared
absorption methods. HP acts on Cz-Si:N and on Cz-Si in a similar way: oxygen
precipitation and creation of numerous cluster-like and extended defects are stimulated,
especially at 1230–1400 K. The small cluster-like oxygen-related defects are, however, more
numerous in HP treated Cz-Si:N while the extended ones (dislocations) are created at
1230 K in a lowered concentration. A qualitative explanation of the observed effects has
been proposed.