The effect on the Schottky barrier height of H-monolayer passivation o
f the Si(111) surface is explored. In our calculations we have analyze
d K/Si(111) interfaces (theta = 1/3 ML) with and without a H interlaye
r. Our results show that the effect of passivation is to reduce the Sc
hottky barrier height, phi(bn), by 0.23 eV. Comparison is made with pr
evious results on passivated GaAs(110) surfaces.