We report on the first experimental evidence of hydrogen-boron interactions
in boron-doped diamond. Deuterium diffusion studies in homoepitaxial B-dop
ed diamond films reveal that hydrogen diffusion is limited by the B concent
ration and is characterized by a low effective diffusion activation energy.
Infrared spectroscopy experiments show that boron acceptor electronic tran
sitions disappear under hydrogenation. These results are consistent with hy
drogen ionization and diffusion of fairly mobile H+ which form pairs with B
-. (C) 1999 Elsevier Science S.A. All rights reserved.