| AVS 55th International Symposium & Exhibition | |
| Electronic Materials and Processing | Wednesday Sessions |
| Session EM+NC-WeA |
| Session: | Molecular and Organic Electronics |
| Presenter: | Y. Qi, University of California, Berkeley and Lawrence Berkeley National Laboratory |
| Authors: | Y. Qi, University of California, Berkeley and Lawrence Berkeley National Laboratory B.L.M. Hendriksen, Lawrence Berkeley National Laboratory F. Martin, Lawrence Berkeley National Laboratory D.F. Ogletree, Lawrence Berkeley National Laboratory C. Mauldin, University of California, Berkeley J.M.J. Frechet, University of California, Berkeley M. Salmeron, Lawrence Berkeley National Laboratory |
| Correspondent: | Click to Email |
Good understanding of the mechanisms responsible for electrical conduction in organic molecules is essential for the development of organic and molecular electronics. In this study we correlate structural and electrical conduction properties of decyl-pentathiophenyl butyric acid monolayers using a conductance atomic force microscope (C-AFM). We used the Langmuir-Blodgett technique to prepare monolayers on heavily doped p-type Si, mica and flat Au substrates. For all substrates we find that two types of structures coexist in the monolayers: one consisting of compact and crystalline islands; the other phase is poorly packed and contains many holes. The magnitude of the friction on crystalline islands is significantly lower than on the poorly packed structure, while the current is at least an order of magnitude higher on the crystalline islands. Scanning on the well-order phase at high loads destroys the lateral order and reduces the conductivity. Our data show that there is a lateral, structural component to the conduction perpendicularly through the monolayer.