2003/06/09 by J. Takeya, C. Goldmann, S. Haas +5 · 4 citations
Engineering · Physics and Astronomy · #Force Microscopy Techniques and Applications #Molecular Junctions and Nanostructures #Organic Electronics and Photovoltaics #cond-mat
paper · pdf · doi:10.1063/1.1618919
published as J. Appl. Phys. Vol. 94, pp. 5800-5804 (2003) · 14 pages, 4 figures. Submitted to J. Appl. Phys
arxiv created 2003/06/09 · openalex publication_date 2003/10/24 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A method has been developed to inject mobile charges at the surface of organic molecular crystals, and the dc transport of field-induced holes has been measured at the surface of pentacene single crystals. To minimize damage to the soft and fragile surface, the crystals are attached to a prefabricated substrate which incorporates a gate dielectric (SiO2) and four probe pads. The surface mobility of the pentacene crystals ranges from 0.1 to 0.5 cm2/V s and is nearly temperature independent above ∼150 K, while it becomes thermally activated at lower temperatures when the induced charges become localized. Ruling out the influence of electric contacts and crystal grain boundaries, the results contribute to the microscopic understanding of trapping and detrapping mechanisms in organic molecular crystals.