AVS 49th International Symposium
    Nanometer Structures Tuesday Sessions
       Session NS-TuP

Paper NS-TuP4
STM and STS Characterization of Silicon Phthalocyanines for the Molecular Quantum Dot Cellular Automata Implementationn

Tuesday, November 5, 2002, 5:30 pm, Room Exhibit Hall B2

Session: Nanometer Structures A
Presenter: M. Manimaran, University of Notre Dame
Authors: M. Manimaran, University of Notre Dame
G.L. Snider, University of Notre Dame
V. Sarveswaran, University of Notre Dame
M. Lieberman, University of Notre Dame
Correspondent: Click to Email
The surface characterization of organic molecules adsorbed on solid surfaces has been investigated intensively in recent years. In particular, the adsorption of long-chain substituted hydrocarbons (CH3(CH2)2X, X= CH3, OH, SH,S,SS, NH2, Cl, Br, I, etc on highly oriented pyrolytic graphite (HOPG) and Au surfaces was well studied because of their importance in wide range of applications in biology and molecular devices such as Quantum-dot cellular automata (QCA). QCA is a computation paradigm based on the Coulomb interactions between the neighboring cells. The prime idea is to represent binary information, not by the state of a current switch, but rather by the configuration of charge in a bistable cell. In its molecular realization the QCA cell can be a single molecule. Si- phthalocyanine (SiPc) is one of the promising candidates for the QCA. In this study, SiPc molecules, which are double-dot-like entities, are deposited on Au and Si(111) substrates initially. These molecules are then observed under UHV-STM to determine if the molecules would self assemble, and also to determine their electronic properties via voltage vs. current (I/V) measurements. In addition to the STM and STS studies, XPS, PL and ellipsometric results will be presented in this paper.