In this work it has been shown that an optimized technology of sublimation
epitaxial growth can be used to obtain structural perfection layers with co
ncentration of uncompensated donors N-d-N-a similar to 1 x 10(15) cm(-3) an
d the hole diffusion length of similar to 2.5 mu m. (C) 1999 Elsevier Scien
ce S.A. All rights reserved.