Structure of the Cl-passivated GaAs(111) surface

Cl 1s (K-shell) near-edge and extended x-ray-absorption fine-structure spectroscopy has been used to study the chemistry and structure of the Cl passivated GaAs(111) surface. The Cl passivation is achieved in ambient atmosphere by wet chemical methods. It is found that Cl forms a stable monochloride structure with Cl bonded to Ga. Strong polarization dependence was observed both in the Cl 1s→3p σ-resonance and in the extended fine-structure …