The initial stage of germanium crystal growth by the low thermal gradient Czochralski technique of pulling from the melt (LTG CZ) has been studied in a series of experiments, in which the processes have been interrupted after pulling 6 mm in dia., 70–80 mm in length crystal rod and then up to 20 mm long a cone part. The axial gradients estimated from computer modelling were 2–2.5 K/cm. Crystals pulled in 〈1 1 1〉 direction with totally faceted interface were dislocation-free if facet formation was not disturbed. Crystals pulled along 〈1 0 0〉 under identical conditions, had rounded interface due to thermal roughens of (1 0 0) faces. In that case, the dislocation density was low, but not below ~102 cm−2.
Предметные области OECD FOS+WOS
- 1.04.FI КРИСТАЛЛОГРАФИЯ
- 2.05 ТЕХНОЛОГИЯ МАТЕРИАЛОВ
- 1.03 ФИЗИЧЕСКИЕ НАУКИ И АСТРОНОМИЯ