Optical absorption study of the interaction between group II acceptors andhydrogen in Si

The interaction between hydrogen (H) and Zn was studied from the measuremen ts of optical absorption spectra of H and Zn-doped Si crystals. FZ Si cryst als were doped with Zn by annealing the crystals in Zn vapor at 1200 degree s C followed by quenching. After Zn-doping, the specimens were doped with H and/or deuterium (D) by annealing them in a H and/or D ambient followed by quenching. Optical absorption spectra of the above specimens were measured at about 6 K with an FT-IR spectrometer. Hydrogen atoms are known to passi vate Zn accepters partially since the optical absorption intensity associat ed with electronic transitions becomes much weaker after hydrogenation. Ins tead, other absorption peaks appear at around 2130 cm(-1). From the compari son of separations of those peaks, they are identified to be due to electro nic transitions associated with Zn-H accepters. Optical absorption peaks as sociated with Zn-D accepters have higher energies by about 12.1 cm(-1) than those of Zn-H accepters.