Incorporation of phosphorus donors in (110)-textured polycrystalline diamond

Abstract

The incorporation efficiency of phosphorus was studied as a function of the surface orientation of grains in (110)-textured polycrystalline chemical vapor deposited diamond. Cathodoluminescence mapping of such films exhibits large local differences in relative intensities stemming from P-bound and free excitons. Combined with electron backscattering diffraction mapping, these data allow assessing of the donor concentration as a function of the grain orientation. While [P] can vary between 10(15) and >10(18) cm(-3) within one film, misorientation angles of more than 10 degrees with respect to the exact [110] axis assure an enhanced incorporation of P with concentrations surpassing 5x10(17) cm(-3). The role of the surface morphology in the observation of these large incorporation differences is explained.