| AVS 55th International Symposium & Exhibition | |
| Electronic Materials and Processing | Thursday Sessions |
| Session EM-ThA |
| Session: | Organic Electronics |
| Presenter: | A.S. Wan, Rutgers University |
| Authors: | A.S. Wan, Rutgers University S. Rangan, Rutgers University D.D.T. Mastrogiovanni, Rutgers University E. Bersch, Rutgers University B. Lee, Rutgers University S. Katalinic, Rutgers University M. Connors, Rutgers University E. Garfunkel, Rutgers University R.A. Bartynski, Rutgers University V. Podzorov, Rutgers University |
| Correspondent: | Click to Email |
We present the first detailed study of energy level modification of single crystal organic semiconductors by functionalization with self-assembled monolayers (SAMs) deposited from the vapor phase by combined photoemission and inverse photoemission spectroscopy (PES-IPES). Large changes in conductivity in organic crystal transistors are observed between pristine and functionalized surfaces. For example, in the case of rubrene functionalized with fluorinated trichlorosilane (FTS) SAMs the conductivity increases almost 6 orders of magnitude at full coverage.1 Preliminary evidence suggests that the presence of electron-withdrawing SAM on the organic crystals acts to p-type dope the surface, which could lead to the observed energy level and conductivity changes. X-ray photoemission (XPS) results examining both the band bending in the bulk of the organic crystals as well as interface chemistry, as well as scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) will also be discussed.
1 M. F. Calhoun, J. Sanchez, D. Olaya, M. E. Gershenson, and V. Podzorov. Nat. Materials 7, 84 (2008).