Photoelectrical imaging and characterization of point contacts in pentacene thin-film transistors

Tsen, AW and Cicoira, F and Malliaras, GG and Park, J (2010) Photoelectrical imaging and characterization of point contacts in pentacene thin-film transistors. Applied Physics Letters, 97. ISSN 0003-6951

Abstract

We report the spatially resolved electrical response of bottom-contact pentacene thin-film transistors to a scanning, focused laser. We find that pentacene films make point-like electrical contacts to the underlying gold electrodes and are able to image them with diffraction-limited resolution. We can further estimate the interfacial resistance associated with hole-injection at an individual point contact, and show that optical activation of one alone increases device current significantly. © 2010 American Institute of Physics.