Negative electron affinity surfaces of aluminum nitride and diamond

Contributors:   Robert J. Nemanich, P.K. Baumann, M.C. Benjamin, S.W. King, J. Van der Weide, R.F. Davis

ABSTRACT

The electron affinity of diamond and AlGaN surfaces are studied by UV photoemission spectroscopy. It is shown that H terminated diamond surfaces exhibit a negative electron affinity while oxide terminated surfaces exhibit a positive electron affinity. In addition, thin metal layers can also induce a NEA on both (100) and (111) surfaces of diamond. Photoemission results of AlGaN alloy films grown on 6H-SiC indicate a negative electron affinity for as-prepared and air exposed surfaces with high Al concentrations.

Publisher: Diamond and Related Materials,   Volume: 5,   790-796 ||  Published: 1996-05 ||   PDF (735.39 KB) ||   Read more...