Seminars Archive
"Traditional" and Novel Applications of LEEM and PEEM
Department of Physics, University of Maryland
Abstract
In this talk I`ll show the results of low energy electron microscopy (LEEM) applied to "traditional" problems of surface science: phase transitions and evaporative growth. Stepped Si(111) surfaces undergo a reversible faceting (orientational phase separation) at elevated temperatures, driven by the formation of the (7x7) reconstruction, whose kinetics we have probed with LEEM. LEEM images of Co/Si(111) reveal a novel reversible compositional phase separation at low coverages, but an irreversible transformation at higher coverages due to the nucleation of CoSi2 islands. I`ll discuss the design and status of the LEEM we`ve built at Maryland. Finally, I`ll present a novel application of photoemission electron microscopy (PEEM), that of characterizing operating semiconductor devices.
