Three different forms of hydrogen molecules in silicon

We have studied three different H-2 molecules in crystalline silicon using Raman scattering. The vibrational line at 3601 cm(-1) attributable to H-2 in Td site is observed both in n-type and p-type crystalline silicon. It is suggested from the hydrogenation-temperature dependence that the charge states and the sites of atomic hydrogen affects the formation of this type of H-2. H-2 in platelet observed at 4158 cm(-1) decreased in its intensity in Si+-implanted silicon. A new vibrational line is detected at 3822 cm(-1) , and attributed to H-2 trapped by hydrogen-related defects such as multivacancies produced by ion implantation.