Experimental results on the vertical gradient freeze growth
of germanium single crystals without crucible contact are presented. Two
different approaches to establish a stable pressure difference necessary for
avoiding the contact between crystal and crucible on solidification are
described. Germanium crystals with a diameter of up to 3 in were grown
almost without contact to the crucible wall. The effect of detachment is
discussed with respect to the microscopical surface roughness and dislocation
density of the grown crystals. In comparison to conventionally grown reference
crystals the structural perfection of the detached-grown crystals is found to
be much higher which can be attributed to the reduced thermal and
thermo-mechanical stress in growth without wall contact.
Source:
Journal of Crystal Growth
If
you need more information about VGF growth of germanium single crystals without
crucible contact, please visit our website:http://www.germaniumwafers.com, send
us email at powerwaymaterial@gmail.com.
No comments:
Post a Comment