low-energy electron diffraction and Auger electron spectroscopic studies were performed on clean and oxidized Zn and O faces of a ZnO crystal. Clean surfaces were obtained by Ar bombardment and annealing. The surface structure of the clean (00•1)Zn face depended upon the annealing temperature. If it were below a certain so-called transition temperature (600C for this sample), the surface was unreconstructed and displayed a (1 x 1) low-energy electron diffraction pattern. For annealing temperatures higher than 600C, the Zn face underwent reconstruction and exhibited a (√3 x √3) pattern, which was retained even after extended exposure to oxygen. The clean (00•1)o face displayed a (1 x 1) pattern, with lines indicative of steps. When this surface was annealed above 600C, there was no sign of reconstruction. The (1 x 1) pattern was retained after exposure to oxygen. After oxygen adsorption, no chemical shift in the Zn or A Auger transitions could be detected on either the (00•1)Zn or the (00•1)O surface.

Some LEED and AES Observations on the Polar Surfaces of ZnO. Y.Margoninski, R.E.Kirby: Journal of Physics C, 1975, 8[10], 1516-23