Patent ID: 6140148
Filing Date: 2000-10-31
Classification: H01L,Y10S

Abstract:
A method of making an ohmic contact to an n-type diamond or an injecting contact to a p-type diamond comprising the steps of:(i) implanting a surface of the diamond with an n-type dopant atom at a dose just below the amorphisation threshold of the diamond to create an implanted region below the surface and extending from the surface;(ii) annealing the implanted region to allow tunneling of electrons into the diamond in the case of an n-type diamond, and allow electrons to be injected into the diamond in the case of a p-type diamond; and(iii) metallising at least a portion of the surface through which implantation occurred;wherein the surface of the diamond is implanted in step (i) with an n-type dopant atom at doses progressively varying from a lower dose for high energy implantation, said lower dose being below the amorphisation threshold of the diamond, to a higher dose for a low energy implantation, said higher dose being above the amorphisation threshold of the diamond, whereby removal of the amorphisized material thus produced after annealing in step (ii), leaves a layer which has received a dose in step (i) just below the amorphisation threshold.