The behavior of type-3d transition metal impurities was investigated by using deep-level transient spectroscopic and Hall-effect measurements. Pairs of donors with B, acting as donors, were detected. The diffusivity of Cr, at temperatures ranging from 300 to 673K, was described by:

D(cm2/s) = 6.8 x 10-4exp[-0.79(eV)/kT]

The electrically active components of Co were judged to be substitutional species. These active components, which represented only a small fraction of the total Co content, had an amphoteric nature in n-type and p-type samples.

H.Nakashima, T.Sadoh, H.Kitagawa, K.Hashimoto: Materials Science Forum, 1994, 143-147, 761-6