This is what I found: Boron doped monocrystalline diamond for power electronic applications Diamond is a very promising wide band gap semiconductor (5.45 eV) exhibiting excellent mobilities for electrons and holes [1]. P-doping can be achieved by introduction of boron atoms in substitution in diamond lattice. (see http://academicpositions.eu/ad/cea-tech/2015/phd-position-boron-doped-monocrystalline-diamond-power-electronic-applications/49215/ )