Experiments showed that ion pairing had a marked effect upon the diffusion of oppositely charged impurities. An analysis of literature data was used to deduce the ion pairing coefficients for n-type impurities with B and In. A coefficient with the value of 0.17/N was found to describe the pairing case of As-B, where N was the intrinsic electron concentration. It was suggested that the paired ions occupied adjacent substitutional sites; with a small perturbation in the Coulomb binding which arose from elastic effects.

N.E.B.Cowern. Applied Physics Letters, 1989, 54[8], 703-5