Experimental Studies of Electron Affinity and Work Function from Aluminium on Oxidised Diamond (100) and (111) Surfaces

Three different procedures were used to deposit aluminium onto O-terminated (100) and (111) boron-doped diamond, with the aim of producing a thermally stable surface with low work function and negative electron affinity. The methods were: (i) deposition of a >20 nm film Al by high-vacuum evaporation, followed by HCl acid wash to remove excess metallic Al, (ii) deposition of