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X-ray Characterization of Detached-Grown Germanium CrystalsGermanium (111)-oriented crystals have been grown by the vertical Bridgman technique, in both detached and attached configurations. Microstructural characterization of these crystals has been performed using synchrotron white beam x-ray topography (SWBXT) and double axis x-ray diffraction. Dislocation densities were measured from x-ray topographs obtained using the reflection geometry. For detached-grown crystals, the dislocation density is 4-6 x 10(exp 4) per square centimeter in the seed region, and decreases in the direction of growth to less than 10(exp 3) per square centimeter, and in some crystals reaches less than 10(exp 2) per square centimeter. For crystals grown in the attached configuration, dislocation densities were on the order of 10(exp 4) per square centimeter in the middle of the crystals, increasing to greater than 10(exp 5) per square centimeter near the edge. The measured dislocation densities are in excellent agreement with etch pit density results. The rocking curve linewidths were relatively insensitive to the dislocation densities. However, broadening and splitting of the rocking curves were observed in the vicinity of subgrain boundaries identified by x-ray topography in some of the attached-grown crystals.
Document ID
20050207515
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Volz, M. P.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Schweizer, M.
(Universities Space Research Association Huntsville, AL, United States)
Raghothamachar, B.
(State Univ. of New York Stony Brook, NY, United States)
Dudley, M.
(State Univ. of New York Stony Brook, NY, United States)
Szoke, J.
(Universities Space Research Association Huntsville, AL, United States)
Cobb, S. D.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Szofran, F. R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Solid-State Physics
Meeting Information
Meeting: American Conference on Crystal Growth and Epitaxy-16
Location: Big Sky, MT
Country: United States
Start Date: July 10, 2005
End Date: July 15, 2005
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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