AVS 51st International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP52
Self-Organized Growth of Nanopucks on 2D Pb Quantum Islands

Tuesday, November 16, 2004, 4:00 pm, Room Exhibit Hall B

Session: Poster Session
Presenter: Y.P. Chiu, National Taiwan Normal University, Taiwan
Authors: Y.P. Chiu, National Taiwan Normal University, Taiwan
H.Y. Lin, Academia Sinica, Taiwan
L.W. Huang, Academia Sinica, Taiwan
C.S. Chang, Academia Sinica, Taiwan
T.T. Tsong, Academia Sinica, Taiwan
Correspondent: Click to Email
Self-organized growth is an attractive approach where a large number of structures can be formed simultaneously. The drawback for this approach involves the apparent difficulty in control of the structureâ?Ts size, their chemical homogeneity, and spatial arrangement. Several routes were taken to search for suitable templates on which the self-organized growth could be made tangibly practical. Regular strain-relief dislocations, periodic surface reconstructions, and Morie patterns have all been applied in attempt to improve the quality of self-organized growth. In this work, we employ the superstructures (electronic Moirè patterns) found on 2D lead (Pb) quantum islands as a template to further grow self-organized 2D clusters (nano-pucks) of various materials. These patterns, originating from charge redistribution in the island in response to the lattice-mismatch-induced interfacial potential variation, thus differ from structure-driven templates. The boundaries of the periodic pattern are apparently repulsive for adatom diffusion. The activation energies for defining the template strength in trapping surface atoms have been obtained, which provide the practical parameters for controlling the size and spatial distribution of the nanopucks. A bi-layer complementary alternating behavior, similar to the confinement-induced phenomenon found in Pb quantum islands, also occurs in the growth of Ag nanopucks on the Pb islands of various thicknesses.