AVS 50th International Symposium
    Organic Films and Devices Tuesday Sessions
       Session OF+EM-TuM

Paper OF+EM-TuM4
Growth Dynamics and Electrical Properties of Pentacene Ultra-thin Films

Tuesday, November 4, 2003, 9:20 am, Room 318/319

Session: Molecular and Organic Films and Devices-Electronics
Presenter: R. Ruiz, Cornell University
Authors: R. Ruiz, Cornell University
A. Mayer, Cornell University
G. Malliaras, Cornell University
R.L. Headrick, University of Vermont
A.Y. Kazimirov, Cornell University
J.R. Engstrom, Cornell University
Correspondent: Click to Email
Organic/inorganic interfaces play a crucial role in the rapidly growing field of molecular electronics. Even though huge progress has been achieved in the understanding of electronic transport in conjugated molecular materials, a complete study that relates the nucleation and growth mechanisms with charge transport properties in pentacene thin films is still missing, especially within the first few monolayers adjacent to the gate substrate where charge transport is believed to occur. Pentacene thin films were evaporated onto silicon oxide substrates and analyzed by in-situ synchrotron X-ray scattering and ex-situ atomic force microscopy (AFM). The evolution of the first monolayers was studied by monitoring the intensity of scattered X-rays at the anti-Bragg position. Layer coverages were then extracted from the X-ray intensities using a simple growth model and compared to AFM micrographs. Film evolution as a function of substrate temperature will also be discussed. Thin film transistors were also fabricated with these films for electrical characterization showing a field effect hole mobility of 0.1 cm@super 2@/V·sec.