Electrochemical atomic force microscope was employed to observe and modify the structure of the GaAs(100) surface and to investigate the electrodeposition of Cu on the p-GaAs(100) face in various electrolyte solutions under potential control. Atomic arrangement of the (100)-(1x1) structure was observed at both p-type and n-type GaAs electrodes. Sub-μm pattern was created by the scanning of an AFM tip. This is due to the tip-induced anodic dissolution reaction. How the Cu deposition proceeded strongly depended on the surface structure of the GaAs, the applied potential, and the concentration of Cu2+ ion in solution. Atomic arrangement corresponding to the Cu(111)-(1x1) was observed on top of the Cu deposits.
ASJC Scopus subject areas
- Chemical Engineering(all)