| AVS 58th Annual International Symposium and Exhibition | |
| Surface Science Division | Tuesday Sessions |
| Session SS+EM-TuA |
| Session: | Organic Electronic Interfaces |
| Presenter: | Janice Reutt-Robey, University of Maryland |
| Authors: | J.E. Reutt-Robey, University of Maryland Y. Wei, University of Maryland |
| Correspondent: | Click to Email |
Abrupt molecular semiconductor interfaces between titanyl phthalocyanine (TiOPc) and C70 were prepared by physical vapor deposition and characterizad by UHV-STM. Molecular TiOPc is a highly anisotropic molecule with a 3.5 dipole moment. Ordered TiOPc monolayer films of the honeycomb phase thus represent a regular 2-d dipolar lattice, which was investigated as an electrostatic template for the growth of the highly polarizable C70. Films of C70 grown layer-by-layer revealed the directed formation of a Kagome lattice. Atomically detailed structural models were obtained for the 0-6 nm C70 thickness (up to 5 ML) range over which the ordering influence of the TiOPc dipolar substrate persists. Unusually low-density C70 molecular packing arrangements result from the ellipsoidal shape, curved surfaces and high polarizability of C70. While Kagome lattices have been frequently observed in colloidal and magnetic systems, this appears to be the first electrostatically-induced Kagome lattice involving a molecular film.
This work has been supported by the National Science Foundation under Surface Analytical Chemistry grant CHE0750203 and under the University of Maryland MRSEC DMR-05-20471