“…Bar rier Hei ght on ZI-1 31 2(eV ) < , reaction are handbook values except for beryllium which was estimated on the basis of its position in the periodic chart, and for chromium, for which a theoretical calculation has been publisbed. The barrier height (7) shows a step-like change around HR -+ 1.0 eV, as do Brillson's data. However for Zn3P2 which is p-type, the higher barrier heights are associated with the lower values of AHR.…”