Oxygen doped Ge crystals Czochralski-grown from the B2O3-fully-covered melt
Local vibrations of oxygen in Ge crystals grown from a melt fully covered by B2O3 were evaluated by Fourier-transform infrared spectroscopy. Ge single crystals containing oxygen were grown by the Czochralski method under various growth conditions. Oxygen concentrations in the crystals were determined to be in the range between 8.51015 and 5.51017cm?3 from the infrared absorption at 855cm?1 originating in local vibration of GeOiGe quasi-molecules. Absorption peaks relating to GeOx, SiOx and SiOiSi were not detected in the as-grown crystals. The calibration coefficient for determining oxygen concentration in Ge crystals from the absorption peak intensity at 1264cm?1 was estimated to be 1.151019cm?2.
oxygen concentration germanium infrared spectra crystal growth