Surface Photovoltage in Photoemission Studies at Si/InP(110) Heterojunctions

We discuss the surface photovoltage effect observed in photoemission experiment performed at room (300 K) and low (120 K) temperatures on Si/InP(110) heterojunctions for a thin Si coverage on n-and p-doped InP substrates.The theoretical analysis of the surface photovoltage effect has been performed on the basis of thermionic and thermionic-field emission models of transport processes in Schottky barriers.