| AVS 55th International Symposium & Exhibition | |
| Surface Science | Wednesday Sessions |
| Session SS1+NC-WeM |
| Session: | Surface Structure and Morphology |
| Presenter: | S. Chiang, University of California Davis |
| Authors: | J. Giacomo, University of California Davis S. Chiang, University of California Davis C. Mullet, University of California Davis A.M. Durand, University of California Davis |
| Correspondent: | Click to Email |
The clean Ge(111) surface has a c(2x8) reconstruction at room temperature. Au growth on Ge(111) above 300°C occurs via nucleation. The first layer is an epitaxial (√3x√3)R30° phase with a coverage of 1ML. Further Au coverage results in the formation of islands. When heated to about 620°C, the (√3x√3)R30° Au transitions to a disordered phase. In LEEM videos, we observed domains fluctuating between the ordered and disordered phases at the transition temperature. For 2 to 10 ML of Au coverage, we have observed three dimensional islands in the LEEM images, as expected for the Stranski-Krastanov growth mode. Surprisingly, the LEEM movies show concerted hopping of islands of approximately 100 nm diameter near 300°C. Preliminary data measured by STM show additional evidence for the Stranski-Krastanov mode.