X-ray photoemission study of the Te-precursor surfaces and the initial stages of growth of ZnTe on GaAs (100)

Abstract
The initial stages of epitaxial growth of ZnTe on GaAs (100) have been studied by x-ray photoemission spectroscopy. The two surface structures (6×1 and (3)1/2×3 ) resulting from the adsorption of Te on GaAs (100) were used as precursor for ZnTe growth. Each of these structures is characterized by two different adsorbed Te states. For the 6×1 structure, the two states are assigned to As–Te–As and tentatively to Te–Te–Te bonds; and for the (3)1/2×3 structure, the assigned bonds are As–Te–As and GaGa Te–As. Growth of ZnTe (100) does not induce any change in the bonds associated with the 6×1 structure but modifies that associated with the (3)1/2×3 surface.