NEGATIVE-ELECTRON-AFFINITY EFFECTS ON THE DIAMOND (100) SURFACE

A negative electron affinity (NEA) was found both experimentally by ph otoemission spectroscopy and theoretically by ab initio calculations o f the 2 x 1 reconstructed diamond (100) surface. This surface is the d ominant growth surface for thin diamond films and can be obtained by c hemical-vapor deposition. Various surface-preparation methods which re sult in a NEA are described. Theoretical results indicate that the obs erved NEA is associated with a monohydride-terminated surface, while t he hydrogen-free surface exhibits a positive electron affinity.