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Keywords:

  • Charge transport;
  • Semiconductors, organic;
  • Single crystals

Abstract

Local surface measurements of rubrene single crystals reveal interesting insights on carrier-transport mechanisms at the active interface of high-performance field-effect “air-gap stamp” transistors, as reported by Fichou, Rogers, and co-workers on p. 1552. Scanning tunneling microscopy (STM, tip shown schematically) images, combined with atomic force microscopy and X-ray diffraction, reveal directly the position and orientation of individual molecules in the a–b plane. Local current–voltage curves recorded using STM in the dark and under illumination indicate a rectifying p-type behavior.