The use of pulsed laser annealing to form ohmic Mo/Ti contacts to diamond

The effect of pulsed laser annealing on the formation of ohmic Mo/Ti contacts to diamond is studied. Using the method of secondary-ion mass spectrometry, it was shown that laser annealing of the contacts leads to effective diffusion of carbon atoms into the titanium layer and the formation of titanium carbide in the transition region with a diamond with a thickness of 15–20 nm. Rapid thermal annealing of the same contact system is accompanied by a sharp increase in the oxygen content in the titanium layer and in the transition layer with diamond and the formation of titanium oxide. In this case, the titanium carbide phase is not formed in the Ti-C transition layer. It was also shown that, in the used laser annealing mode, graphitization of the contact layer of diamond does not occur, which could drastically reduce the mechanical strength and adhesion of the contacts.